Date created: 12/21/15 17:00:12. Last modified: 08/13/20 16:11:01

ASR1000 Embeded Packet Capture

References:
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/epc/configuration/xe-3s/asr1000/epc-xe-3s-asr1000-book/nm-packet-capture-xe.html
http://www.foxnetwork.ru/index.php/en/component/content/article/113-cisco-asr-sniffering.html

Generic Capture

monitor capture cb buffer size 1 limit pps 10000 duration 10 packet-len 2000 interface Hu2/0/0 both match ipv4 any any
show monitor capture cb
monitor capture cb start
monitor capture cb stop
show monitor capture cb buffer
show monitor capture cb buffer dump
monitor capture cb clear
no monitor capture cb

 

Capture with ACL

Packet capture of a subscriber pinging a loopback on an ASR that acts as an LNS. ASR/LNS IP is 111.22.22.111 and LAC/BRAS is 11.222.222.11. Subscriber is 1.2.3.4 (01020304) and loopback is 100.66.0.13 (6442000D).

lns(config)#ip access-list extended L2TP-ACL
lns(config-ext-nacl)#10 permit udp any any eq 1701
lns(config-ext-nacl)#20 permit udp any eq 1701 any

lns#show access-lists L2TP-ACL
Extended IP access list L2TP-ACL
    10 permit udp any any eq 1701
    20 permit udp any eq 1701 any


lns#monitor capture ?
  WORD  Name of the Capture

lns#monitor capture L2TP_Cap ?
  access-list    access-list to be attached
  buffer         Buffer options
  class-map      class name to attached
  clear          Clear Buffer
  control-plane  Control Plane
  export         Export Buffer
  interface      Interface
  limit          Limit Packets Captured
  match          Describe filters inline
  start          Enable Capture
  stop           Disable Capture

lns#monitor capture L2TP_Cap access-list L2TP-ACL interface gi0/0/0.201 both limit packets 10

lns#monitor capture L2TP_Cap start

lns#show monitor capture L2TP_Cap

Status Information for Capture L2TP_Cap
  Target Type:
   Interface: GigabitEthernet0/0/0.201, Direction: both
   Status : Active
  Filter Details:
   Access-list: L2TP-ACL
  Buffer Details:
   Buffer Type: LINEAR (default)
   Buffer Size (in MB): 10
  Limit Details:
   Number of Packets to capture: 10
   Packet Capture duration: 0 (no limit)
   Packet Size to capture: 0 (no limit)
   Maximum number of packets to capture per second: 1000
   Packet sampling rate: 0 (no sampling)

lns#show monitor capture L2TP_Cap buffer
 buffer size (KB) : 10240
 buffer used (KB) : 128
 packets in buf   : 10
 packets dropped  : 0
 packets per sec  : 1


lns#show monitor capture L2TP_Cap

Status Information for Capture L2TP_Cap
  Target Type:
   Interface: GigabitEthernet0/0/0.201, Direction: both
   Status : Inactive
  Filter Details:
   Access-list: L2TP-ACL
  Buffer Details:
   Buffer Type: LINEAR (default)
   Buffer Size (in MB): 10
  Limit Details:
   Number of Packets to capture: 10
   Packet Capture duration: 0 (no limit)
   Packet Size to capture: 0 (no limit)
   Maximum number of packets to capture per second: 1000
   Packet sampling rate: 0 (no sampling)

lns#show monitor capture L2TP_Cap buffer brief
 -------------------------------------------------------------
 #   size   timestamp     source             destination   protocol
 -------------------------------------------------------------
   0  100    0.000000   11.222.222.11    ->  111.22.22.111    UDP
   1  102    0.000000   111.22.22.111    ->  11.222.222.11    UDP
   2  156    0.784007   11.222.222.11    ->  111.22.22.111    UDP
   3  158    0.784007   111.22.22.111    ->  11.222.222.11    UDP
   4  100    2.016005   11.222.222.11    ->  111.22.22.111    UDP
   5  102    2.016005   111.22.22.111    ->  11.222.222.11    UDP
   6  100    4.029997   11.222.222.11    ->  111.22.22.111    UDP
   7  102    4.029997   111.22.22.111    ->  11.222.222.11    UDP
   8  100    6.046994   11.222.222.11    ->  111.22.22.111    UDP
   9  102    6.046994   111.22.22.111    ->  11.222.222.11    UDP


lns#show monitor capture L2TP_Cap buffer detailed
 -------------------------------------------------------------
 #   size   timestamp     source             destination   protocol
 -------------------------------------------------------------
.....

   2  156    0.784007   11.222.222.11    ->  111.22.22.111    UDP
  0000:  58F39C8A 8A00A80C 0D33A828 810000C9   X........3.(....
  0010:  08004500 008A3CA3 0000F811 F0E60BDE   ..E...<.......Q.
  0020:  DE0B6F16 166F06A5 06A50076 00000002   y<.........v....
  0030:  4E7EDF6D FF030021 45000064 00160000   N~.m...!E..d....

   3  158    0.784007   111.22.22.111    ->  11.222.222.11    UDP
  0000:  A80C0D33 A82858F3 9C8A8A00 810000C9   ...3.(X.........
  0010:  08004500 008C0583 0000FF11 21056F16   ..E.........!...
  0020:  166F0BDE DE0B06A5 06A50078 00000202   ..Q.y<.....x....
  0030:  7E8CD889 0000FF03 00214500 00640016   ~........!E..d..




lns#show monitor capture L2TP_Cap buffer dump
.....

2
  0000:  58F39C8A 8A00A80C 0D33A828 810000C9   X........3.(....
  0010:  08004500 008A3CA3 0000F811 F0E60BDE   ..E...<.......Q.
  0020:  DE0B6F16 166F06A5 06A50076 00000002   y<.........v....
  0030:  4E7EDF6D FF030021 45000064 00160000   N~.m...!E..d....
  0040:  FF01C270 01020304 6442000D 0800BA12   ...pR.A.dB......
  0050:  000A0000 00000000 192DAB00 ABCDABCD   .........-......
  0060:  ABCDABCD ABCDABCD ABCDABCD ABCDABCD   ................
  0070:  ABCDABCD ABCDABCD ABCDABCD ABCDABCD   ................
  0080:  ABCDABCD ABCDABCD ABCDABCD ABCDABCD   ................
  0090:  ABCDABCD ABCDABCD ABCDABCD            ............

3
  0000:  A80C0D33 A82858F3 9C8A8A00 810000C9   ...3.(X.........
  0010:  08004500 008C0583 0000FF11 21056F16   ..E.........!...
  0020:  166F0BDE DE0B06A5 06A50078 00000202   ..Q.y<.....x....
  0030:  7E8CD889 0000FF03 00214500 00640016   ~........!E..d..
  0040:  0000FF01 C2706442 000D0102 03040000   .....pdB..R.A...
  0050:  C212000A 00000000 0000192D AB00ABCD   ...........-....
  0060:  ABCDABCD ABCDABCD ABCDABCD ABCDABCD   ................
  0070:  ABCDABCD ABCDABCD ABCDABCD ABCDABCD   ................
  0080:  ABCDABCD ABCDABCD ABCDABCD ABCDABCD   ................
  0090:  ABCDABCD ABCDABCD ABCDABCD ABCD       ..............

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