Logging into a Linux shell from a Cisco ASR1000 Series Router

Cisco’s ASR1000 series of routers come in many form factors that all provide a number of different features, and options in terms of scalability. One thing common to all of the devices in this product line is that their IOS XE software that performs all of the standard routing operations for the platform is running on top of a Linux kernel. This post describes how to enter a linux shell on your router and run some basic linux commands to really get an idea of what your router has going on under the hood so to speak.

Do so at your own risk, as Cisco’s advises to only use this under their supervision of Cisco Support. This post is limited to viewing different things to get an idea of what is underlying on the system. It’s best to err on the side of caution and NOT do this on a production router, and be expecially careful to not edit/delete anything that’s vital as a mistake at this level of the router can cause major issues with any or all functions of the device.

With that being said, let’s dig in. For this demonstration I opened a shell into the RP, or the route processor of the router. The ASR1000 series routers consists of a chassis/slots/cards, which make up the physical ports on the router, the embedded service processor, the SIP(SPA Interface Processor), and the RP(Route Processor)

To open up a shell into the system you use the following command, the ? mark gives you the options to open a shell into the SIP, ESP, or RP

Router1#request platform software system shell ?
 0   SPA-Inter-Processor slot 0
 F0  Embedded-Service-Processor slot 0
 FP  Embedded-Service-Processor
 R0  Route-Processor slot 0
 RP  Route-Processor
 <cr>

For our purposes I opened a shell into the RP that was in the Active state, in case your router has more than one RP installed.

Router1#request platform software system shell rp active

Upon entering this command you are immediately met with a confirmation to continue along with the warning below:

Activity within this shell can jeopardize the functioning of the system.
 Are you sure you want to continue? [y/n] y
 es2014/05/11 21:33:31 : Shell access was granted to user <anon>; Trace file: , /harddisk/tracelogs/system_shell_R0.log.20140511213331
 **********************************************************************
 Activity within this shell can jeopardize the functioning
 of the system.
 Use this functionality only under supervision of Cisco Support.
Session will be logged to:
 harddisk:tracelogs/system_shell_R0.log.20140511213331
 **********************************************************************

You are now dropped into the shell for the RP, and into the prompt below:

[Router1_RP_0:/]$

Now it’s time to run some commands to familiarize yourself with whats running underneath your router.

The first thing we’ll run will be the linux command ‘uname’ to find out what we’re running on:

[Router1_RP_0:/]$ uname -a
 Linux Router1_RP_0 2.6.27.45 #1 Fri Mar 25 01:08:36 PDT 2011 ppc ppc ppc GNU/Linux

Next are a couple of commands to show us where we are in the system, and what commands we have available to us from the shell of the RP:

[Router1_RP_0:/]$ pwd
 /
 [Router1_RP_0:/]$ ls -l
 total 72
 drwxr-xr-x    2 root   root     0 Jan 16 13:53 auto
 drwxr-xr-x    2 904735   25     0 Jan 16 13:53 bin
 drwxr-xr-x    8 root   root  4096 May 11 21:31 bootflash
 -rwxr-xr-x    1 904735   25 53772 Dec 31  1969 common
 lrwxrwxrwx    1 root   root    10 Jan 16 13:53 config -> /bootflash
 drwxrwxrwt    6 root   root 15560 Jan 16 13:55 dev
 lrwxrwxrwx    1 root   root    10 Jan 16 13:53 disk0 -> /vol/disk0
 drwxr-xr-x   15 904735   25     0 Jan 16 13:54 etc
 lrwxrwxrwx    1 root   root    13 Jan 16 13:53 harddisk -> /misc/scratch
 lrwxrwxrwx    1 root   root    33 Jan 16 13:53 issu -> /tmp/sw/rp/0/0/rp_base/mount/issu
 drwxr-xr-x    3 904735   25     0 Jan 16 13:53 lib
 -rwxr-xr-x    1 904735   25  5000 Dec 31  1969 lkern_init
 drwxr-xr-x    2 root   root     0 Jan 16 13:53 misc
 drwxr-xr-x    3 root   root     0 Jan 16 13:53 mnt
 drwxr-xr-x    3 root   root     0 Dec 31  1969 obfl
 dr-xr-xr-x  146 root   root     0 Dec 31  1969 proc
 -rwxr-xr-x    1 904735   25  1090 Dec 31  1969 rommon_to_env
 drwx------    2 root   root     0 Dec 31  1969 root
 drwxr-xr-x    2 904735   25     0 Jan 16 13:53 sbin
 drwxr-xr-x   11 root   root     0 Dec 31  1969 sys
 drwxr-xr-x    2 root   root     0 Jan 16 13:54 tftp
 drwxrwxrwt   17 root   root   560 May 11 21:33 tmp
 lrwxrwxrwx    1 root   root    10 Jan 16 13:53 usb0 -> /misc/usb0
 lrwxrwxrwx    1 root   root    10 Jan 16 13:53 usb1 -> /misc/usb1
 drwxr-xr-x    7 904735   25     0 Jan 16 13:53 usr
 drwxr-xr-x   10 root   root     0 Jan 16 13:54 var
 drwxr-xr-x    7 root   root     0 Jan 16 13:54 vol
[Router1_RP_0:/]$ ls /bin
 arch      chown   dd       echo   gdbserver    ipcalc    lsmod          mktemp   od     readlink  sha1sum          stty  test    tsort    usleep
 basename  chroot  df       egrep  get_me_bash  kill    mcp_pkg_wrap  mount    ping     rm       sleep          sync  touch    tty    vi
 bash      comm      dirname  env      grep           ln    md5sum          mv       ping6     rmdir       sort              tail  tr        umount    wc
 cat      cp      dmesg    expr   head           login    mkdir          netstat  printenv  sed       split          tar   tracepath    uname    who
 chgrp      cut      doexec   false  hostname     logname    mkfifo          nice     ps     seq       start-stop-daemon  tcsh  traceroute    uniq    whoami
 chmod      date      du       fgrep  id           ls    mknod          nohup    pwd     sh       stat              tee   true    uptime    yes
[Router1_RP_0:/]$ ls /sbin
 agetty       chvrf    e2image    fsck.msdos  hdparm     initlog        iptables          lspci     mkfs.msdos  pidof     rmmod         shutdown     telinit
 arp       consoletype    e2label    fsck.vfat   hwclock     insmod            iptables-restore  mkdosfs     mkfs.vfat   pivot_root  route         start_udev  tune2fs
 badblocks  ctrlaltdel    fdisk       fuser       ifconfig  ip            iptables-save     mke2fs     mkswap      portmap     runlevel    sulogin     udevcontrol
 blkid       depmod    fsck       genhostid   ifdown     ip6tables        killall5          mkfs     modinfo     poweroff     service     swapon     udevd
 blockdev   dosfsck    fsck.ext2  getkey      ifup     ip6tables-restore  klogd          mkfs.ext2  modprobe    reboot     setsysfont  sysctl     udevsettle
 cfdisk       dumpe2fs    fsck.ext3  halt        init     ip6tables-save     lsof          mkfs.ext3  nameif      resize2fs     sfdisk      syslogd     udevtrigger

Next, we’ll run the ‘set’ command to view some of the environment variables that are configured.

[Router1_RP_0:/]$ set
 BASH=/bin/bash
 BASH_ARGC=()
 BASH_ARGV=()
 BASH_LINENO=()
 BASH_SOURCE=()
 BASH_VERSINFO=([0]="3" [1]="2" [2]="51" [3]="1" [4]="release" [5]="powerpc-unknown-linux-gnu")
 BASH_VERSION='3.2.51(1)-release'
 BINOS_ACCESS_RUN_MODE=0
 BINOS_BASE_DIR=/tmp/rp
 BINOS_BAY_LOCAL=0
 BINOS_BIN_DIR=/usr/binos/bin/rp
 BINOS_BTRACE_FILE_PATH=/tmp/rp/trace
 BINOS_BTRACE_LEVEL=err
 BINOS_CHASFS_ROOT=/tmp/rp/chasfs
 BINOS_CHASSIS_XML=/usr/binos/conf/chassis.xml
 BINOS_CMRP_IMAGE_ROOT=/tftp
 BINOS_CMRP_TFTP_PORT=69
 BINOS_CONF_DIR=/usr/binos/conf
 BINOS_DUAL_IOS_CAPABLE=1
 BINOS_DUAL_IOS_REQUESTED=0
 BINOS_FRU_BASE_PKG=rp_base
 BINOS_FRU_LOCAL=BINOS_FRU_RP
 BINOS_LIPC_PATH=/tmp/rp/lipc
 BINOS_NVRAM_DIR=/config
 BINOS_RAMFS_DIR=/tmp
 BINOS_SLOT_LOCAL=0
 BINOS_TDLDB_PATH=/tmp/rp/tdldb
 BINOS_USER_NAME=
 BINOS_USER_TMPDIR=/tmp/tmppub
 BINOS_USER_TTY='vty 0'
 BINOS_USER_UI_CLIENT=ios
 BRELAY_SH_BTRACE_LEVEL=NOTICE
 COLUMNS=168
 CPP_BIN_DIR=/usr/cpp/bin/rp
 CPP_CONF_DIR=/usr/cpp/conf
 CPP_STARTUP_FILE=/tmp/rp/cpp_startup_complete
 CPP_STARTUP_WAIT=120
 DIRSTACK=()
 EUID=0
 GROUPS=()
 HISTFILE=/root/.bash_history
 HISTFILESIZE=500
 HISTSIZE=500
 HOSTNAME=Router1_RP_0
 HOSTTYPE=powerpc
 IFS=$' \t\n'
 LINES=44
 LOGDIR=/tmp/rp
 LOGFILE=/tmp/rp/pvp_log
 MACHTYPE=powerpc-unknown-linux-gnu
 MAILCHECK=60
 MQIPC_PREFIX_NAME=
 NETIO_NETMAP=/usr/binos/bin/rp/NETMAP
 OPTERR=1
 OPTIND=1
 OSTYPE=linux-gnu
 PATH=/tmp/sw/rp/0/0/rp_daemons/mount/bin:/tmp/sw/rp/0/0/rp_daemons/mount/usr/bin:/tmp/sw/rp/0/0/rp_daemons/mount/usr/binos/conf:/tmp/sw/rp/0/0/rp_daemons/mount/usr/binos/sbin:/tmp/sw/rp/0/0/rp_daemons/mount/usr/binos/bin:/tmp/sw/rp/0/0/rp_daemons/mount/usr/cpp/bin:/usr/bin:/bin:/sbin:/usr/binos/conf:/usr/binos/bin
 PIPESTATUS=([0]="127")
 PPID=4062
 PROC_SCOREBOARD_BKTRACE_FILE=/tmp/rp/process/brelay%rp_0_0/brelay%rp_0_0.backtrace
 PROF_DIR=/harddisk
 PS1='[\h:\w]$ '
 PS2='> '
 PS4='+ '
 PWD=/
 REAL_MGMTE_DEV=eth2
 REMOTEHOST=192.168.1.2
 ROMMON_BINFOVER=5
 ROMMON_BOOT='bootflash:asr1000rp1-advipservicesk9.03.03.00.S.151-2.S.bin,1;'
 ROMMON_BSI=0
 ROMMON_MCP_STARTUP_TRACEFLAGS=00000000:00000000
 ROMMON_NT_K=0:0:0:0
 ROMMON_PLATFORM_MAX_INTERFACES=
 ROMMON_PS1='rommon _ _ '
 ROMMON_RANDOM_NUM=1820195334
 ROMMON_RET_2_RCALTS=
 ROMMON_RET_2_RTS='04:43:33 CDT Sun Mar 25 2012'
 ROMMON_VERSION='12.2(33r)XNC'
 SHELL=/bin/bash
 SHELLOPTS=braceexpand:emacs:hashall:histexpand:history:interactive-comments:monitor
 SHLVL=5
 SW_FRU_BASE=/tmp/sw/rp/0/0/rp_daemons/mount
 TERM=xterm
 UID=0
 USER=binos
 _=lsblk

Below is the output of the ‘ps -elf’ command to view all of the system processes:

[Router1_RP_0:/]$ ps -elf
 F S UID        PID  PPID  C PRI  NI ADDR SZ WCHAN  STIME TTY          TIME CMD
 4 S root         1     0  0  80   0 -   539 select Jan16 ?        00:00:18 init [3]
 5 S root         2     0  0  75  -5 -     0 kthrea Jan16 ?        00:00:00 [kthreadd]
 1 S root         3     2  0  75  -5 -     0 ksofti Jan16 ?        00:00:32 [ksoftirqd/0]
 5 S root         4     2  0 -40   - -     0 watchd Jan16 ?        00:00:00 [watchdog/0]
 5 S root         5     2  0  75  -5 -     0 worker Jan16 ?        00:00:04 [events/0]
 1 S root         6     2  0  75  -5 -     0 worker Jan16 ?        00:00:00 [khelper]
 1 S root         9     2  0  75  -5 -     0 worker Jan16 ?        00:00:00 [netns]
 1 S root        61     2  0  75  -5 -     0 worker Jan16 ?        00:00:00 [kblockd/0]
 1 S root        69     2  0  75  -5 -     0 worker Jan16 ?        00:00:00 [ata/0]
 1 S root        70     2  0  75  -5 -     0 worker Jan16 ?        00:00:00 [ata_aux]
 1 S root        76     2  0  75  -5 -     0 hub_th Jan16 ?        00:00:00 [khubd]
 1 S root        79     2  0  75  -5 -     0 serio_ Jan16 ?        00:00:00 [kseriod]
 1 S root       124     2  0  80   0 -     0 pdflus Jan16 ?        00:00:01 [pdflush]
 1 S root       125     2  0  80   0 -     0 pdflus Jan16 ?        00:00:01 [pdflush]
 1 S root       126     2  0  75  -5 -     0 kswapd Jan16 ?        00:00:00 [kswapd0]
 1 S root       178     2  0  75  -5 -     0 worker Jan16 ?        00:00:00 [aio/0]
 0 S root      1010 14198  0  80   0 -   799 hrtime 15:04 ?        00:00:00 sleep 1d
 1 S root      1011     2  0  75  -5 -     0 mtd_bl Jan16 ?        00:00:00 [mtdblockd]
 1 S root      1077     2  0  75  -5 -     0 scsi_e Jan16 ?        00:00:00 [scsi_eh_0]
 1 S root      1078     2  0  75  -5 -     0 usb_st Jan16 ?        00:00:28 [usb-storage]
 1 S root      1095     2  0  75  -5 -     0 worker Jan16 ?        00:00:09 [mcp-rtc-wq]
 5 S root      2179     2  0  75  -5 -     0 worker Jan16 ?        00:00:00 [rpciod/0]
 1 S root      2184     2  0  75  -5 -     0 worker Jan16 ?        00:00:00 [nfsiod]
 1 S root      2224     2  0  60 -20 -     0 loop_t Jan16 ?        00:00:01 [loop0]
 5 S bin       2322     1  0  80   0 -   561 sys_po Jan16 ?        00:00:00 portmap
 1 S root      2376     2  0  60 -20 -     0 loop_t Jan16 ?        00:00:00 [loop1]
 1 S root      2413     2  0  60 -20 -     0 loop_t Jan16 ?        00:00:00 [loop2]
 1 S root      2450     2  0  60 -20 -     0 loop_t Jan16 ?        00:00:00 [loop3]
 1 S root      2487     2  0  60 -20 -     0 loop_t Jan16 ?        00:00:00 [loop4]
 1 S root      2596     2  0  60 -20 -     0 loop_t Jan16 ?        00:00:00 [loop5]
 1 S root      2633     2  0  60 -20 -     0 loop_t Jan16 ?        00:00:00 [loop6]
 1 S root      2706     2  0  60 -20 -     0 loop_t Jan16 ?        00:00:00 [loop7]
 0 S root      3318 26082  0  80   0 -   799 hrtime 21:31 ?        00:00:00 sleep 300
 4 S root      3833 31486  0  80   0 -   988 wait   21:33 ?        00:00:00 /bin/bash /usr/binos/conf/in.telnetd.sh -L /usr/binos/conf/brelay.sh
 4 S root      3919  3833  0  80   0 -  2251 select 21:33 ?        00:00:00 in.telnetd: 192.168.1.2
 0 S root      3920  3919  0  80   0 -   988 wait   21:33 ttyp0    00:00:00 /bin/bash /usr/binos/conf/brelay.sh -h 192.168.1.2 -p
 4 S binos     4006  3920  0  80   0 -   929 wait   21:33 ttyp0    00:00:00 /bin/sh /usr/binos/conf/bexec.sh -c /usr/binos/conf/mcp_record_shell.sh  -e BINOS_USER_NAME=?
 0 S binos     4009  4006  0  80   0 -   922 wait   21:33 ttyp0    00:00:00 /bin/sh /usr/binos/conf/mcp_chvrf.sh eobc /usr/binos/conf/bexecute.sh -c /usr/binos/conf/mcp_
 4 S root      4010  4009  0  80   0 -  1005 wait   21:33 ttyp0    00:00:00 /bin/sh /usr/binos/conf/mcp_record_shell.sh
 4 S root      4061  4010  0  80   0 -   517 read_c 21:33 ttyp0    00:00:00 /usr/bin/script -q /harddisk/tracelogs/system_shell_R0.log.20140511213331
 1 R root      4062  4061  0  80   0 -   518 -      21:33 ttyp0    00:00:00 /usr/bin/script -q /harddisk/tracelogs/system_shell_R0.log.20140511213331
 0 S root      4063  4062  0  80   0 -   808 wait   21:33 ttyp1    00:00:00 bash -i
 0 S root      4491 31494  0  80   0 -   799 hrtime 21:33 ?        00:00:00 sleep 60
 0 S root      4677 31735  0  80   0 -   799 hrtime 21:34 ?        00:00:00 sleep 100
 0 S root      5164 27864  0  80   0 -   799 hrtime 21:34 ?        00:00:00 sleep 45
 4 R root      5165  4063  0  80   0 -   727 -      21:34 ttyp1    00:00:00 ps -elf
 5 S root     12757     1  0  76  -4 -   534 select Jan16 ?        00:00:00 /sbin/udevd -d
 1 S root     13890     2  0  90  10 -     0 jffs2_ Jan16 ?        00:00:00 [jffs2_gcd_mtd1]
 0 S root     14198     1  0  80   0 -   790 wait   Jan16 ?        00:00:00 /bin/bash /etc/auxport.sh
 4 S root     14219     1  0  80   0 -  1109 pipe_w Jan16 ?        00:09:54 /bin/bash /usr/binos/conf/reflector.sh
 4 S root     14225     1  0  80   0 -  1112 pipe_w Jan16 ?        00:00:00 /bin/bash /usr/binos/conf/droputil.sh
 5 S root     14320     1  0  80   0 -  6649 rt_sig Jan16 ?        00:00:00 automount
 5 S root     14352     1  0  80   0 -   871 select Jan16 ?        00:00:00 xinetd -stayalive -pidfile /var/run/xinetd.pid -f /etc/xinetd.conf
 5 S root     14354     1  0  80   0 -   871 select Jan16 ?        00:00:00 xinetd -stayalive -pidfile /var/run/xinetd_telnetd.pid -f /etc/xinetd_telnetd.conf
 1 S root     14373     2  0  75  -5 -     0 svc_re Jan16 ?        00:00:00 [lockd]
 1 S root     14375     2  0  75  -5 -     0 svc_re Jan16 ?        00:00:00 [nfsd]
 1 S root     14376     2  0  75  -5 -     0 svc_re Jan16 ?        00:00:00 [nfsd]
 1 S root     14377     2  0  75  -5 -     0 svc_re Jan16 ?        00:00:00 [nfsd]
 1 S root     14378     2  0  75  -5 -     0 svc_re Jan16 ?        00:00:00 [nfsd]
 1 S root     14379     2  0  75  -5 -     0 svc_re Jan16 ?        00:00:00 [nfsd]
 1 S root     14380     2  0  75  -5 -     0 svc_re Jan16 ?        00:00:00 [nfsd]
 1 S root     14381     2  0  75  -5 -     0 svc_re Jan16 ?        00:00:00 [nfsd]
 1 S root     14382     2  0  75  -5 -     0 svc_re Jan16 ?        00:00:00 [nfsd]
 1 S root     14385     1  0  80   0 -   577 select Jan16 ?        00:00:00 rpc.mountd
 1 R root     14471     2  0  75  -5 -     0 -      Jan16 ?        00:00:45 [lsmpi-refill]
 1 S root     14472     2  0  75  -5 -     0 lsmpi_ Jan16 ?        00:07:34 [lsmpi-xmit]
 1 R root     14473     2  0  75  -5 -     0 -      Jan16 ?        00:08:41 [lsmpi-rx]
 0 S root     15437     1  0  80   0 -  2080 pipe_w Jan16 ?        00:00:14 /usr/bin/rotee -f reflector_14219 -p /tmp/rp/trace/fifo/reflector_sh%rp_0_0_14219_fifo
 0 S root     15444     1  0  80   0 -  2080 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f droputil_14225 -p /tmp/rp/trace/fifo/droputil_sh%rp_0_0_14225_fifo
 0 S root     15491 14225  0  80   0 -   517 select Jan16 ?        00:00:00 inotifywait -r -m --format %w,%-e,%f -e close_write -e move -e create -e delete /tmp/rp/chasf
 0 S root     15500 14219  0  80   0 -   517 select Jan16 ?        00:00:00 inotifywait -r -m --format %w,%-e,%f -e close_write -e move -e create -e delete /tmp/rp/chasf
 5 S root     21324     1  0  80   0 -   474 syslog Jan16 ?        00:00:00 /sbin/klogd -2
 4 S root     21335     1  0  80   0 -  1089 pipe_w Jan16 ?        00:00:00 /bin/bash /usr/binos/conf/pvp.sh
 0 S root     21382     1  0  80   0 -  2080 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f pvp -p /tmp/rp/trace/fifo/pvp_sh%rp_0_0_21335_fifo
 0 S root     21500 21335  0  80   0 -   517 select Jan16 ?        00:00:00 inotifywait -m --format %w,%-e,%f -e DELETE -e CREATE /tmp/rp/pvp/control /tmp/rp/pvp/process
 4 S root     21568 21335  0  74  -6 -  1074 wait   Jan16 ?        00:00:00 /bin/bash /tmp/sw/rp/0/0/rp_base/mount/usr/binos/conf/pman.sh
 0 S root     21652     1  0  80   0 -  2081 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f /tmp/rp/trace/btrace_rotate_sh_pmanlog -p /tmp/rp/trace/fifo/pman_sh%rp_0_0
 4 S root     21717 21335  0  74  -6 -  1070 wait   Jan16 ?        00:00:00 /bin/bash /usr/binos/conf/pman.sh
 0 S root     21872     1  0  80   0 -  2081 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f /tmp/rp/trace/cmand_pmanlog -p /tmp/rp/trace/fifo/pman_sh%rp_0_0_21717_fifo
 4 S root     21976 21335  0  74  -6 -  1070 wait   Jan16 ?        00:00:00 /bin/bash /usr/binos/conf/pman.sh
 0 S root     22164     1  0  80   0 -  2081 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f /tmp/rp/trace/emd_pmanlog -p /tmp/rp/trace/fifo/pman_sh%rp_0_0_21976_fifo
 4 S root     22323 21335  0  74  -6 -  1071 wait   Jan16 ?        00:00:00 /bin/bash /usr/binos/conf/pman.sh
 4 R root     22403 21568  0  80   0 -  1238 -      Jan16 ?        03:21:28 /bin/bash /tmp/sw/mount/asr1000rp1-rpbase.03.03.00.S.151-2.S.pkg/usr/binos/conf/btrace_rotate
 0 S root     22564     1  0  80   0 -  2081 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f /tmp/rp/trace/fman_rp_pmanlog -p /tmp/rp/trace/fifo/pman_sh%rp_0_0_22323_fi
 0 S root     22672     1  0  80   0 -  2081 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f btrace_rotate_sh -p /tmp/rp/trace/fifo/btrace_rotate_sh%rp_0_0_22403_fifo
 4 S root     22748 21717  0  80   0 -  6798 select Jan16 ?        18:04:24 /tmp/sw/mount/asr1000rp1-rpcontrol.03.03.00.S.151-2.S.pkg/usr/binos/bin/cmand
 4 S root     22857 21335  0  74  -6 -  1070 wait   Jan16 ?        00:00:00 /bin/bash /usr/binos/conf/pman.sh
 4 S root     23109 21976  0  80   0 -  4873 select Jan16 ?        01:05:50 /tmp/sw/mount/asr1000rp1-rpcontrol.03.03.00.S.151-2.S.pkg/usr/binos/bin/emd
 0 S root     23149     1  0  80   0 -  2081 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f /tmp/rp/trace/hman_pmanlog -p /tmp/rp/trace/fifo/pman_sh%rp_0_0_22857_fifo
 4 S root     23307 21335  0  74  -6 -  1070 wait   Jan16 ?        00:00:00 /bin/bash /usr/binos/conf/pman.sh
 4 S root     23565 22323  0  80   0 - 27502 select Jan16 ?        01:39:18 /tmp/sw/mount/asr1000rp1-rpcontrol.03.03.00.S.151-2.S.pkg/usr/binos/bin/fman_rp -N
 0 S root     23598     1  0  80   0 -  2081 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f /tmp/rp/trace/imand_pmanlog -p /tmp/rp/trace/fifo/pman_sh%rp_0_0_23307_fifo
 4 S root     24127 21335  0  74  -6 -  1071 wait   Jan16 ?        00:00:00 /bin/bash /usr/binos/conf/pman.sh
 4 S root     24282 22857  0  80   0 -  4034 select Jan16 ?        03:25:02 /tmp/sw/mount/asr1000rp1-rpcontrol.03.03.00.S.151-2.S.pkg/usr/binos/bin/hman -c
 0 S root     24387     1  0  80   0 -  2081 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f /tmp/rp/trace/linux_iosd_image_pmanlog -p /tmp/rp/trace/fifo/pman_sh%rp_0_0
 4 S root     24682 23307  0  80   0 -  6579 select Jan16 ?        23:10:13 /tmp/sw/mount/asr1000rp1-rpcontrol.03.03.00.S.151-2.S.pkg/usr/binos/bin/imand
 4 S root     24811 21335  0  74  -6 -  1075 wait   Jan16 ?        00:00:00 /bin/bash /tmp/sw/rp/0/0/rp_base/mount/usr/binos/conf/pman.sh
 0 S root     25027     1  0  80   0 -  2081 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f /tmp/rp/trace/periodic_sh_pmanlog -p /tmp/rp/trace/fifo/pman_sh%rp_0_0_2481
 4 S root     25190 21335  0  74  -6 -  1071 wait   Jan16 ?        00:00:00 /bin/bash /usr/binos/conf/pman.sh
 4 R root     25404 24127  1  80   0 - 489173 -     Jan16 ?        1-14:12:36 /tmp/sw/mount/asr1000rp1-rpios-advipservicesk9.03.03.00.S.151-2.S.pkg/usr/binos/bin/linux_i
 0 S root     25452     1  0  80   0 -  2081 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f /tmp/rp/trace/plogd_pmanlog -p /tmp/rp/trace/fifo/pman_sh%rp_0_0_25190_fifo
 4 S root     25576 21335  0  74  -6 -  1071 wait   Jan16 ?        00:00:00 /bin/bash /usr/binos/conf/pman.sh
 0 S root     25837     1  0  80   0 -  2081 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f /tmp/rp/trace/psd_pmanlog -p /tmp/rp/trace/fifo/pman_sh%rp_0_0_25576_fifo
 4 S root     26082 24811  0  80   0 -  1221 wait   Jan16 ?        00:02:51 /bin/bash /tmp/sw/mount/asr1000rp1-rpbase.03.03.00.S.151-2.S.pkg/usr/binos/conf/periodic.sh
 4 S root     26251 21335  0  74  -6 -  1072 wait   Jan16 ?        00:00:00 /bin/bash /usr/binos/conf/pman.sh
 0 S root     26348     1  0  80   0 -  2081 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f periodic -p /tmp/rp/trace/fifo/periodic_sh%rp_0_0_26082_fifo
 0 S root     26502 25190  0  80   0 -  3986 select Jan16 ?        00:01:25 /tmp/sw/mount/asr1000rp1-rpcontrol.03.03.00.S.151-2.S.pkg/usr/binos/bin/plogd
 0 S root     26522     1  0  80   0 -  2081 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f /tmp/rp/trace/smand_pmanlog -p /tmp/rp/trace/fifo/pman_sh%rp_0_0_26251_fifo
 4 S root     26693 21335  0  74  -6 -  1075 wait   Jan16 ?        00:00:00 /bin/bash /tmp/sw/rp/0/0/rp_base/mount/usr/binos/conf/pman.sh
 4 S root     26910 25576  0  80   0 -  4923 select Jan16 ?        00:01:34 /tmp/sw/mount/asr1000rp1-rpaccess.03.03.00.S.151-2.S.pkg/usr/binos/bin/psd -f /tmp/sw/rp/0/0/
 0 S root     26968     1  0  80   0 -  2081 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f /tmp/rp/trace/sort_files_by_inode_sh_pmanlog -p /tmp/rp/trace/fifo/pman_sh%
 4 S root     27536 26251  0  80   0 - 25375 select Jan16 ?        01:11:38 /tmp/sw/mount/asr1000rp1-rpcontrol.03.03.00.S.151-2.S.pkg/usr/binos/bin/smand -i /tmp/sw/rp/0
 0 S root     27864 26693  0  80   0 -  1051 wait   Jan16 ?        00:53:59 /bin/bash /tmp/sw/mount/asr1000rp1-rpbase.03.03.00.S.151-2.S.pkg/usr/binos/conf/sort_files_by
 4 S root     31481     1  0  80   0 -   792 wait   Jan16 ?        00:00:00 /bin/sh /usr/binos/conf/mcp_chvrf.sh liin /usr/sbin/xinetd -f /tmp/etc/xinetd_brelay_liin.con
 4 S root     31482     1  0  80   0 -   792 wait   Jan16 ?        00:00:00 /bin/sh /usr/binos/conf/mcp_chvrf.sh eobc /usr/sbin/xinetd -f /tmp/etc/xinetd_brelay_eobc.con
 4 S root     31484     1  0  80   0 -   769 skb_re Jan16 ?        00:00:03 /usr/bin/sntp -S
 0 S root     31486 31481  0  80   0 -   871 select Jan16 ?        00:00:00 /usr/sbin/xinetd -f /tmp/etc/xinetd_brelay_liin.conf -dontfork
 4 S root     31487     1  0  80   0 -   895 pipe_w Jan16 ?        00:00:00 /bin/bash /usr/binos/conf/rollback_timer.sh
 0 S root     31488 31482  0  80   0 -   871 select Jan16 ?        00:00:00 /usr/sbin/xinetd -f /tmp/etc/xinetd_brelay_eobc.conf -dontfork
 4 S root     31491     1  0  80   0 -   887 wait   Jan16 ?        00:00:00 /bin/bash /usr/binos/conf/oom.sh
 4 S root     31494     1  0  80   0 -  1256 wait   Jan16 ?        00:21:01 /bin/bash /usr/binos/conf/chasync.sh
 4 S root     31498     1  0  80   0 -  1003 pipe_w Jan16 ?        00:00:00 /bin/bash /usr/binos/conf/iptbl.sh
 0 S root     31676     1  0  80   0 -  2080 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f inst_rollback_timer -p /tmp/rp/trace/fifo/rollback_timer_sh%rp_0_0_31487_fi
 0 S root     31693     1  0  80   0 -  2080 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f oom -p /tmp/rp/trace/fifo/oom_sh%rp_0_0_31491_fifo
 0 S root     31716     1  0  80   0 -  2080 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f iptbl -p /tmp/rp/trace/fifo/iptbl_sh%rp_0_0_31498_fifo
 0 S root     31731     1  0  80   0 -  2080 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f chasync -p /tmp/rp/trace/fifo/chasync_sh%rp_0_0_31494_fifo
 1 S root     31735 31491  0  80   0 -  1134 wait   Jan16 ?        00:02:40 /bin/bash /usr/binos/conf/oom.sh
 0 S root     31736 31487  0  80   0 -   516 select Jan16 ?        00:00:00 inotifywait -m --format %w,%-e,%f -e DELETE -e CREATE /bootflash/.rollback_timer /tmp/rp/roll
 0 S root     31755 31498  0  80   0 -   516 select Jan16 ?        00:00:00 inotifywait -r -m --format %w,%-e,%f -e create /tmp/rp/chasfs/etc/iptbl

Since we mentioned at the beginning of the article, that the IOS running on an ASR1000 series router is actually ran on top of the Linux kernel running on the hardware, you can view the IOS running as a process within the Linux environment running on the router by entering the command below to ‘grep’ for the ‘iosd’ process.

[Router1_RP_0:/]$ ps -elf | grep iosd
 0 S root      5352  4063  0  80   0 -   492 pipe_w 21:34 ttyp1    00:00:00 grep iosd
 0 S root     24387     1  0  80   0 -  2081 pipe_w Jan16 ?        00:00:00 /usr/bin/rotee -f /tmp/rp/trace/linux_iosd_image_pmanlog -p /tmp/rp/trace/fifo/pman_sh%rp_0_0_24127_fifo
 4 R root     25404 24127  1  80   0 - 489173 -     Jan16 ?        1-14:12:36 /tmp/sw/mount/asr1000rp1-rpios-advipservicesk9.03.03.00.S.151-2.S.pkg/usr/binos/bin/linux_iosd-image -n 32768 -m 1800 -c /config

By running the command ‘mount’, you can see various directories that are mounted by the system:

[Router1_RP_0:/]$ mount
 rootfs on / type rootfs (rw)
 tmpfs on /tmp type tmpfs (rw,size=2743944k,nr_inodes=116713)
 proc on /proc type proc (rw)
 sysfs on /sys type sysfs (rw)
 none on /dev type tmpfs (rw,size=1829296k,nr_inodes=116713,mode=755)
 /dev/bootflash1 on /bootflash type ext2 (rw,errors=continue)
 /dev/loop1 on /tmp/sw/mount/asr1000rp1-rpbase.03.03.00.S.151-2.S.pkg type iso9660 (ro)
 /dev/loop2 on /tmp/sw/mount/asr1000rp1-rpcontrol.03.03.00.S.151-2.S.pkg type iso9660 (ro)
 /dev/loop3 on /tmp/sw/mount/asr1000rp1-rpios-advipservicesk9.03.03.00.S.151-2.S.pkg type iso9660 (ro)
 /dev/loop4 on /tmp/sw/mount/asr1000rp1-rpaccess.03.03.00.S.151-2.S.pkg type iso9660 (ro)
 /dev/loop5 on /tmp/sw/mount/asr1000rp1-espbase.03.03.00.S.151-2.S.pkg type iso9660 (ro)
 /dev/loop6 on /tmp/sw/mount/asr1000rp1-sipbase.03.03.00.S.151-2.S.pkg type iso9660 (ro)
 /dev/loop7 on /tmp/sw/mount/asr1000rp1-sipspa.03.03.00.S.151-2.S.pkg type iso9660 (ro)
 none on /dev type tmpfs (rw)
 /proc/bus/usb on /proc/bus/usb type usbfs (rw)
 /dev/mtdblock1 on /obfl type jffs2 (rw,noatime,nodiratime)
 /etc/auto.vol on /vol type autofs (rw,fd=5,pgrp=14320,timeout=60,minproto=5,maxproto=5,indirect)

The commands below will give you a listing of the volumes available on the device itself, and also list certain packages that are mounted by the system:

[Router1_RP_0:/]$ ls -al /vol
 total 0
 drwxr-xr-x   7 root   root 0 Jan 16 13:54 .
 drwxr-xr-x  20 904735   25 0 Jan 16 13:54 ..
 dr-xr-xr-x   2 root   root 0 Jan 16 13:54 bootflash4
 dr-xr-xr-x   2 root   root 0 Jan 16 13:54 disk0
 dr-xr-xr-x   2 root   root 0 Jan 16 13:54 harddisk
 dr-xr-xr-x   2 root   root 0 Jan 16 13:54 usb0
 dr-xr-xr-x   2 root   root 0 Jan 16 13:54 usb1
[Router1_RP_0:/]$ ls -al /tmp/sw/mount
 total 14
 drwxr-xr-x   9 root root  180 Jan 16 13:53 .
 drwxr-xr-x  14 root root  280 Jan 16 13:54 ..
 dr-xr-xr-x   9 root root 2048 Mar 25  2011 asr1000rp1-espbase.03.03.00.S.151-2.S.pkg
 dr-xr-xr-x   7 root root 2048 Mar 25  2011 asr1000rp1-rpaccess.03.03.00.S.151-2.S.pkg
 dr-xr-xr-x   8 root root 2048 Mar 25  2011 asr1000rp1-rpbase.03.03.00.S.151-2.S.pkg
 dr-xr-xr-x   6 root root 2048 Mar 25  2011 asr1000rp1-rpcontrol.03.03.00.S.151-2.S.pkg
 dr-xr-xr-x   6 root root 2048 Mar 25  2011 asr1000rp1-rpios-advipservicesk9.03.03.00.S.151-2.S.pkg
 dr-xr-xr-x  10 root root 2048 Mar 25  2011 asr1000rp1-sipbase.03.03.00.S.151-2.S.pkg
 dr-xr-xr-x   6 root root 2048 Mar 25  2011 asr1000rp1-sipspa.03.03.00.S.151-2.S.pkg

The command below can be ran to take a look at the cpu information of the router:

[Router1_RP_0:/]$ cat /proc/cpuinfo
 processor    : 0
 cpu        : e500v2
 clock        : 1400.000000MHz
 revision    : 2.2 (pvr 8021 0022)
 bogomips    : 99.84
 timebase    : 50000000
 platform    : MPC85xx ADS
 model        : MPC8540ADS
 Vendor        : Freescale Semiconductor
 Machine        : mpc85xx
 PVR        : 0x80210022
 SVR        : 0x80390021
 PLL setting    : 0x7
 Memory        : 4031 MB

The ‘route’ and ‘arp’ commands ran within the RP shell session will give you information of the private IP addresses that are used internally to communicate with the different physical cards in the router. This is for communication between the ESP, SIP, and RP.

[Router1_RP_0:/]$ route
 Kernel IP routing table
 Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
 10.2.0.0        *               255.255.0.0     U     0      0        0 eth0
 10.0.0.0        *               255.255.0.0     U     0      0        0 eth0
[Router1_RP_0:/]$ arp -a
 cc0 (10.2.0.100) at 00:00:03:00:00:00 [ether] on eth0
 fp-active (10.2.0.3) at 00:00:02:00:00:00 [ether] on eth0
 ? (10.0.2.0) at 00:00:02:00:00:00 [ether] on eth0
 ? (10.0.3.0) at 00:00:03:00:00:00 [ether] on eth0

Using telnet from the shell session into the RP, we can log into the SIP, which is a separate linecard in the router itself , or a built-in piece of hardware that manages the interfaces themselves.

[Router1_RP_0:/]$ telnet 10.0.3.0
 Trying 10.0.3.0...
Connected to 10.0.3.0.
Escape character is '^]'.
Linux 2.6.27.45 (Router1_SIP_0) (ttyp0)
2014/05/11 21:36:53 : <anon>
[Router1_SIP_0:~]$

We’ll stick to the RP and the information we can gather from it, so we’ll just exit from the telnet session to the SIP, and drop back into the RP. This was just to show you the functionality of being able to jump from one device to the other within the router.

[Router1_SIP_0:~]$ exit
 Connection closed by foreign host.
[Router1_RP_0:/]$

In case you need to plan any boring meetings or important appointments while you’re shelled into your router, you can always use the ‘calendar’ command.

[Router1_RP_0:/]$ calendar
 May 2014
 Su Mo Tu We Th Fr Sa
 1  2  3
 4  5  6  7  8  9 10
 11 12 13 14 15 16 17
 18 19 20 21 22 23 24
 25 26 27 28 29 30 31

Remember the IP connectivity between the ESP, SIP, and RP? You can run a ‘tcpdump’ and see how chatty they all are with each other:

[Router1_RP_0:/]$ /usr/sbin/tcpdump
 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
 listening on eth0, link-type EN10MB (Ethernet), capture size 68 bytes
 21:41:40.409468 arp who-has fp0-0 tell rp0-0
 21:41:40.409496 arp reply fp0-0 is-at 00:00:02:00:00:00
 21:41:40.410259 IP fp0-0.34322 > rp0-0.2000: P 285904656:285905314(658) ack 2091012006 win 713 <nop,nop,timestamp 1369550425 1369654125>
 21:41:40.410305 IP rp0-0.2000 > fp0-0.34322: . ack 658 win 5316 <nop,nop,timestamp 1369655125 1369550425>
 21:41:40.463446 IP rp0-0.2004 > fp0-0.34757: . ack 2424389883 win 91 <nop,nop,timestamp 1369655179 1369545478>
 21:41:40.463506 IP fp0-0.34757 > rp0-0.2004: . ack 1 win 92 <nop,nop,timestamp 1369550478 1369654942>
 21:41:40.464445 IP rp0-0.2006 > fp0-0.36162: . ack 2437229998 win 91 <nop,nop,timestamp 1369655180 1369545479>
 21:41:40.464492 IP fp0-0.36162 > rp0-0.2006: . ack 1 win 92 <nop,nop,timestamp 1369550479 1369654942>
 21:41:40.527302 IP cc0-0.47049 > rp0-0.2000: P 2107703344:2107703673(329) ack 2952028107 win 561 <nop,nop,timestamp 1369497903 1369654242>
 21:41:40.527335 IP rp0-0.2000 > cc0-0.47049: . ack 329 win 2685 <nop,nop,timestamp 1369655242 1369497903>
 21:41:40.554447 IP rp0-0.2418 > fp0-0.48788: . ack 2504349267 win 1714 <nop,nop,timestamp 1369655270 1369545569>
 21:41:40.554503 IP fp0-0.48788 > rp0-0.2418: . ack 1 win 6122 <nop,nop,timestamp 1369550569 1369650305>
 21:41:40.589890 IP fp0-0.48788 > rp0-0.2418: . ack 1 win 6122 <nop,nop,timestamp 1369550605 1369650305>
 21:41:40.589921 IP rp0-0.2418 > fp0-0.48788: . ack 1 win 1714 <nop,nop,timestamp 1369655305 1369550569>
 21:41:41.307953 IP fp0-0.51314 > rp0-0.2416: P 2939036053:2939036705(652) ack 2506809225 win 92 <nop,nop,timestamp 1369551323 1369653886>
 21:41:41.308009 IP rp0-0.2416 > fp0-0.51314: . ack 652 win 6122 <nop,nop,timestamp 1369656023 1369551323>
 21:41:41.388856 IP rp0-0.4006 > cc0-0.4000: UDP, length: 60
 21:41:41.410235 IP fp0-0.34322 > rp0-0.2000: P 658:1316(658) ack 1 win 713 <nop,nop,timestamp 1369551425 1369655125>
 21:41:41.410290 IP rp0-0.2000 > fp0-0.34322: . ack 1316 win 5316 <nop,nop,timestamp 1369656125 1369551425>
 21:41:41.527322 IP cc0-0.47049 > rp0-0.2000: P 329:658(329) ack 1 win 561 <nop,nop,timestamp 1369498903 1369655242>
 21:41:41.527377 IP rp0-0.2000 > cc0-0.47049: . ack 658 win 2685 <nop,nop,timestamp 1369656242 1369498903>
 21:41:41.734197 IP cc0-0.4000 > rp0-0.4006: UDP, length: 66
 21:41:41.812933 IP fp0-0.41524 > rp0-0.2008: . ack 2304358824 win 92 <nop,nop,timestamp 1369551828 1369651528>
 21:41:41.812983 IP rp0-0.2008 > fp0-0.41524: . ack 1 win 175 <nop,nop,timestamp 1369656528 1369550203>
 21:41:42.014180 IP cc0-0.59792 > rp0-0.2002: P 3212627474:3212627702(228) ack 3116626034 win 1988 <nop,nop,timestamp 1369499390 1369654730>
 21:41:42.044525 IP cc0-0.59792 > rp0-0.2002: P 228:1127(899) ack 1 win 1988 <nop,nop,timestamp 1369499420 1369654730>
 21:41:42.044576 IP rp0-0.2002 > cc0-0.59792: . ack 1127 win 6122 <nop,nop,timestamp 1369656760 1369499390>
 21:41:42.044586 IP cc0-0.59792 > rp0-0.2002: P 1127:2026(899) ack 1 win 1988 <nop,nop,timestamp 1369499420 1369654730>
 21:41:42.044599 IP cc0-0.59792 > rp0-0.2002: P 2026:2925(899) ack 1 win 1988 <nop,nop,timestamp 1369499420 1369654730>
 21:41:42.044642 IP cc0-0.59792 > rp0-0.2002: P 2925:3824(899) ack 1 win 1988 <nop,nop,timestamp 1369499420 1369654730>
 21:41:42.044719 IP cc0-0.59792 > rp0-0.2002: P 3824:3876(52) ack 1 win 1988 <nop,nop,timestamp 1369499420 1369656760>
 21:41:42.044772 IP cc0-0.59792 > rp0-0.2002: P 3876:4775(899) ack 1 win 1988 <nop,nop,timestamp 1369499420 1369656760>
 21:41:42.044801 IP cc0-0.59792 > rp0-0.2002: P 4775:5674(899) ack 1 win 1988 <nop,nop,timestamp 1369499420 1369656760>
 21:41:42.044830 IP cc0-0.59792 > rp0-0.2002: P 5674:6573(899) ack 1 win 1988 <nop,nop,timestamp 1369499420 1369656760>
 21:41:42.044858 IP cc0-0.59792 > rp0-0.2002: P 6573:7472(899) ack 1 win 1988 <nop,nop,timestamp 1369499420 1369656760>
 21:41:42.044887 IP cc0-0.59792 > rp0-0.2002: P 7472:8371(899) ack 1 win 1988 <nop,nop,timestamp 1369499420 1369656760>
 21:41:42.044918 IP cc0-0.59792 > rp0-0.2002: P 8371:9270(899) ack 1 win 1988 <nop,nop,timestamp 1369499420 1369656760>
 21:41:42.044950 IP cc0-0.59792 > rp0-0.2002: P 9270:10169(899) ack 1 win 1988 <nop,nop,timestamp 1369499420 1369656760>
 21:41:42.044980 IP cc0-0.59792 > rp0-0.2002: P 10169:11068(899) ack 1 win 1988 <nop,nop,timestamp 1369499420 1369656760>
 21:41:42.045008 IP cc0-0.59792 > rp0-0.2002: P 11068:11967(899) ack 1 win 1988 <nop,nop,timestamp 1369499420 1369656760>
 21:41:42.045069 IP cc0-0.59792 > rp0-0.2002: P 11967:12866(899) ack 1 win 1988 <nop,nop,timestamp 1369499421 1369656760>
 21:41:42.045102 IP cc0-0.59792 > rp0-0.2002: P 12866:12918(52) ack 1 win 1988 <nop,nop,timestamp 1369499421 1369656760>
 21:41:42.045148 IP cc0-0.59792 > rp0-0.2002: P 12918:13817(899) ack 1 win 1988 <nop,nop,timestamp 1369499421 1369656760>
 21:41:42.045177 IP cc0-0.59792 > rp0-0.2002: P 13817:14716(899) ack 1 win 1988 <nop,nop,timestamp 1369499421 1369656760>
 21:41:42.045207 IP cc0-0.59792 > rp0-0.2002: P 14716:15615(899) ack 1 win 1988 <nop,nop,timestamp 1369499421 1369656760>
 21:41:42.045233 IP cc0-0.59792 > rp0-0.2002: P 15615:16514(899) ack 1 win 1988 <nop,nop,timestamp 1369499421 1369656760>
 21:41:42.045261 IP cc0-0.59792 > rp0-0.2002: P 16514:17413(899) ack 1 win 1988 <nop,nop,timestamp 1369499421 1369656760>
 21:41:42.045296 IP cc0-0.59792 > rp0-0.2002: P 17413:18312(899) ack 1 win 1988 <nop,nop,timestamp 1369499421 1369656760>
 21:41:42.045316 IP cc0-0.59792 > rp0-0.2002: P 18312:18763(451) ack 1 win 1988 <nop,nop,timestamp 1369499421 1369656760>
 21:41:42.046065 IP cc0-0.59792 > rp0-0.2002: P 18763:18881(118) ack 1 win 1988 <nop,nop,timestamp 1369499421 1369656760>
 21:41:42.059856 IP rp0-0.2002 > cc0-0.59792: . ack 18881 win 6081 <nop,nop,timestamp 1369656775 1369499420>
 21:41:42.059996 IP rp0-0.2002 > cc0-0.59792: P 1:53(52) ack 18881 win 6081 <nop,nop,timestamp 1369656775 1369499420>
 21:41:42.060071 IP cc0-0.59792 > rp0-0.2002: . ack 53 win 1988 <nop,nop,timestamp 1369499436 1369656775>
 21:41:42.060141 IP rp0-0.2002 > cc0-0.59792: P 53:105(52) ack 18881 win 6081 <nop,nop,timestamp 1369656775 1369499436>
 21:41:42.060193 IP cc0-0.59792 > rp0-0.2002: . ack 105 win 1988 <nop,nop,timestamp 1369499436 1369656775>
 21:41:42.075067 IP cc0-0.46379 > rp0-0.2007: . ack 3018871003 win 127 <nop,nop,timestamp 1369499451 1369651790>
 21:41:42.075114 IP rp0-0.2007 > cc0-0.46379: . ack 1 win 2654 <nop,nop,timestamp 1369656790 1369494451>
 21:41:42.075443 IP rp0-0.2007 > cc0-0.46379: . ack 1 win 2654 <nop,nop,timestamp 1369656791 1369494451>
 21:41:42.075497 IP cc0-0.46379 > rp0-0.2007: . ack 1 win 127 <nop,nop,timestamp 1369499451 1369656790>
 21:41:42.076049 IP cc0-0.46064 > rp0-0.2007: . ack 3038202180 win 127 <nop,nop,timestamp 1369499452 1369651791>
 21:41:42.076068 IP rp0-0.2007 > cc0-0.46064: . ack 1 win 2654 <nop,nop,timestamp 1369656791 1369494452>
 21:41:42.076443 IP rp0-0.2007 > cc0-0.46064: . ack 1 win 2654 <nop,nop,timestamp 1369656792 1369494452>
 21:41:42.076458 IP rp0-0.2007 > cc0-0.41694: . ack 3252000029 win 2654 <nop,nop,timestamp 1369656792 1369494452>
 21:41:42.076492 IP cc0-0.46064 > rp0-0.2007: . ack 1 win 127 <nop,nop,timestamp 1369499452 1369656791>
 21:41:42.076513 IP cc0-0.41694 > rp0-0.2007: . ack 1 win 127 <nop,nop,timestamp 1369499452 1369651792>
 21:41:42.077045 IP cc0-0.41694 > rp0-0.2007: . ack 1 win 127 <nop,nop,timestamp 1369499453 1369651792>
 21:41:42.077061 IP rp0-0.2007 > cc0-0.41694: . ack 1 win 2654 <nop,nop,timestamp 1369656792 1369499452>
 21:41:42.079980 IP cc0-0.59792 > rp0-0.2002: P 18881:19394(513) ack 105 win 1988 <nop,nop,timestamp 1369499455 1369656775>
 21:41:42.080711 IP cc0-0.41694 > rp0-0.2007: P 1:172(171) ack 1 win 127 <nop,nop,timestamp 1369499456 1369656792>
 21:41:42.080754 IP rp0-0.2007 > cc0-0.41694: . ack 172 win 2654 <nop,nop,timestamp 1369656796 1369499456>
 21:41:42.081946 IP cc0-0.46379 > rp0-0.2007: P 1:172(171) ack 1 win 127 <nop,nop,timestamp 1369499457 1369656790>
 21:41:42.081983 IP rp0-0.2007 > cc0-0.46379: . ack 172 win 2654 <nop,nop,timestamp 1369656797 1369499457>
 21:41:42.082944 IP cc0-0.46064 > rp0-0.2007: P 1:172(171) ack 1 win 127 <nop,nop,timestamp 1369499458 1369656791>
 21:41:42.082990 IP rp0-0.2007 > cc0-0.46064: . ack 172 win 2654 <nop,nop,timestamp 1369656798 1369499458>
 21:41:42.085032 IP cc0-0.53672 > rp0-0.2007: . ack 3054838804 win 127 <nop,nop,timestamp 1369499461 1369651801>
 21:41:42.085054 IP rp0-0.2007 > cc0-0.53672: . ack 1 win 5316 <nop,nop,timestamp 1369656800 1369494461>
 21:41:42.085443 IP rp0-0.2007 > cc0-0.53672: . ack 1 win 5316 <nop,nop,timestamp 1369656801 1369494461>
 21:41:42.085474 IP cc0-0.53672 > rp0-0.2007: . ack 1 win 127 <nop,nop,timestamp 1369499461 1369656800>
 21:41:42.089451 IP rp0-0.2007 > cc0-0.37355: . ack 3404816227 win 2654 <nop,nop,timestamp 1369656805 1369494466>
 21:41:42.089517 IP cc0-0.37355 > rp0-0.2007: . ack 1 win 127 <nop,nop,timestamp 1369499465 1369651805>
 21:41:42.090037 IP cc0-0.37355 > rp0-0.2007: . ack 1 win 127 <nop,nop,timestamp 1369499466 1369651805>
 21:41:42.090055 IP rp0-0.2007 > cc0-0.37355: . ack 1 win 2654 <nop,nop,timestamp 1369656805 1369499465>
 21:41:42.119470 IP rp0-0.2002 > cc0-0.59792: . ack 19394 win 6122 <nop,nop,timestamp 1369656835 1369499455>
 21:41:42.410269 IP fp0-0.34322 > rp0-0.2000: P 1316:1974(658) ack 1 win 713 <nop,nop,timestamp 1369552425 1369656125>
 21:41:42.410330 IP rp0-0.2000 > fp0-0.34322: . ack 1974 win 5316 <nop,nop,timestamp 1369657125 1369552425>
 21:41:42.526467 IP rp0-0.2000 > cc0-0.47049: . ack 658 win 2685 <nop,nop,timestamp 1369657242 1369498903>
 21:41:42.526537 IP cc0-0.47049 > rp0-0.2000: . ack 1 win 561 <nop,nop,timestamp 1369499902 1369656242>
 21:41:42.527314 IP cc0-0.47049 > rp0-0.2000: P 658:987(329) ack 1 win 561 <nop,nop,timestamp 1369499903 1369656242>
 21:41:42.527356 IP rp0-0.2000 > cc0-0.47049: . ack 987 win 2685 <nop,nop,timestamp 1369657242 1369499903>
 ^C
 89 packets captured
 89 packets received by filter
 0 packets dropped by kernel

And if you’re curious what’s hogging all of your CPU, the ‘top’ command works here as well:

[Router1_RP_0:/]$ top
 top - 21:41:49 up 115 days,  6:38,  0 users,  load average: 0.15, 0.09, 0.08
 Tasks: 130 total,   3 running, 127 sleeping,   0 stopped,   0 zombie
 Cpu(s):  1.8%us,  2.7%sy,  0.0%ni, 95.5%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
 Mem:   3874976k total,  1689436k used,  2185540k free,   116612k buffers
 Swap:        0k total,        0k used,        0k free,  1056060k cached
 
   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                                                    
 24682 root      20   0 26316  14m  13m S  9.8  0.4   1390:17 imand                                                                                                      
 10497 root      20   0  2648 1168  888 R  2.0  0.0   0:00.01 top                                                                                                        
     1 root      20   0  2156  640  552 S  0.0  0.0   0:18.07 init                                                                                                       
     2 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 kthreadd                                                                                                   
     3 root      15  -5     0    0    0 S  0.0  0.0   0:32.09 ksoftirqd/0                                                                                                
     4 root      RT  -5     0    0    0 S  0.0  0.0   0:00.06 watchdog/0                                                                                                 
     5 root      15  -5     0    0    0 S  0.0  0.0   0:04.48 events/0                                                                                                   
     6 root      15  -5     0    0    0 S  0.0  0.0   0:00.02 khelper                                                                                                    
     9 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 netns                                                                                                      
    61 root      15  -5     0    0    0 S  0.0  0.0   0:00.06 kblockd/0                                                                                                  
    69 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 ata/0                                                                                                      
    70 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 ata_aux                                                                                                    
    76 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 khubd                                                                                                      
    79 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 kseriod                                                                                                    
   124 root      20   0     0    0    0 S  0.0  0.0   0:01.11 pdflush                                                                                                    
   125 root      20   0     0    0    0 S  0.0  0.0   0:01.30 pdflush                                                                                                    
   126 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 kswapd0                                                                                                    
   178 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 aio/0                                                                                                      
  1010 root      20   0  3196  620  528 S  0.0  0.0   0:00.00 sleep                                                                                                      
  1011 root      15  -5     0    0    0 S  0.0  0.0   0:00.23 mtdblockd                                                                                                  
  1077 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 scsi_eh_0                                                                                                  
  1078 root      15  -5     0    0    0 S  0.0  0.0   0:28.76 usb-storage                                                                                                
  1095 root      15  -5     0    0    0 S  0.0  0.0   0:09.00 mcp-rtc-wq                                                                                                 
  2179 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 rpciod/0                                                                                                   
  2184 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 nfsiod                                                                                                     
  2224 root       0 -20     0    0    0 S  0.0  0.0   0:01.30 loop0                                                                                                      
  2322 bin       20   0  2244  688  564 S  0.0  0.0   0:00.00 portmap                                                                                                    
  2376 root       0 -20     0    0    0 S  0.0  0.0   0:00.02 loop1                                                                                                      
  2413 root       0 -20     0    0    0 S  0.0  0.0   0:00.11 loop2                                                                                                      
  2450 root       0 -20     0    0    0 S  0.0  0.0   0:00.31 loop3                                                                                                      
  2487 root       0 -20     0    0    0 S  0.0  0.0   0:00.01 loop4                                                                                                      
  2596 root       0 -20     0    0    0 S  0.0  0.0   0:00.06 loop5                                                                                                      
  2633 root       0 -20     0    0    0 S  0.0  0.0   0:00.01 loop6                                                                                                      
  2706 root       0 -20     0    0    0 S  0.0  0.0   0:00.11 loop7                                                                                                      
  3833 root      20   0  3952 2232 1228 S  0.0  0.1   0:00.11 in.telnetd.sh                                                                                              
  3919 root      20   0  9004 2248 1740 S  0.0  0.1   0:00.04 in.telnetd                                                                                                 
  3920 root      20   0  3952 2232 1228 S  0.0  0.1   0:00.11 brelay.sh                                                                                                  top - 21:41:52 up 115 days,  6:38,  0 users,  load average: 0.14, 0.09, 0.08
 Tasks: 130 total,   2 running, 128 sleeping,   0 stopped,   0 zombie
 Cpu(s):  6.6%us, 14.5%sy,  0.0%ni, 78.9%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
 Mem:   3874976k total,  1689684k used,  2185292k free,   116612k buffers
 Swap:        0k total,        0k used,        0k free,  1056068k cached
 

Well that wraps up some of the more basic things you can explore within your ASR1000 series router’s Linux shell. There are a host of other in depth functions that can be done from here, all have varying degrees of risk and should only be attempted in a lab environment or under Cisco’s supervision. Hopefully this has provided you with some information of some of the interworkings of your router that go a little deeper than the regular IOS commands, and really delve into what is running underneath it all to make it work.

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