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Display Detailed BGP Protocol Information

Action

To display BGP protocol information in detail, follow these steps:

  1. In configuration mode, go to the following hierarchy level:
    [edit]user@host# edit protocol bgp traceoptions
  2. Configure the flag to display detailed BGP protocol messages:
    [edit protocols bgp traceoptions]user@host# set flag update detail
  3. Verify the configuration:
    user@host# show

    For example:

    [edit protocols bgp traceoptions]user@host# show flag update detail;
  4. Commit the configuration:
    user@host# commit
  5. View the contents of the file containing the detailed messages:
    user@host# run show log filename

    For example:

    [edit protocols bgp traceoptions]user@pro5-a# run show log bgp Sep 17 14:47:16 trace_on: Tracing to "/var/log/bgp" startedSep 17 14:47:17 bgp_read_v4_update: receiving packet(s) from 10.255.245.53 (Internal AS 10458)Sep 17 14:47:17 BGP RECV 10.255.245.53+179 -> 10.255.245.50+1141Sep 17 14:47:17 BGP RECV message type 2 (Update) length 128Sep 17 14:47:17 BGP RECV flags 0x40 code Origin(1): IGPSep 17 14:47:17 BGP RECV flags 0x40 code ASPath(2): 2Sep 17 14:47:17 BGP RECV flags 0x80 code MultiExitDisc(4): 0Sep 17 14:47:17 BGP RECV flags 0x40 code LocalPref(5): 100Sep 17 14:47:17 BGP RECV flags 0xc0 code Extended Communities(16): 2:10458:1[...Output truncated...]

Meaning

Table 1 lists tracing flags specific to BGP and presents example output for some of the flags. You can also configure tracing for a specific BGP peer or peer group. For more information, see the JUNOS System Basics Configuration Guide.

Table 1: BGP Protocol Tracing Flags

Tracing Flags

Description

Example Output

aspath

AS path regular expression operations

Not available.

damping

Damping operations

Nov 28 17:01:12 bgp_damp_change: Change event
Nov 28 17:01:12 bgp_dampen: Damping 10.10.1.0
Nov 28 17:01:12 bgp_damp_change: Change event
Nov 28 17:01:12 bgp_dampen: Damping 10.10.2.0
Nov 28 17:01:12 bgp_damp_change: Change event
Nov 28 17:01:12 bgp_dampen: Damping 10.10.3.0

keepalive

BGP keepalive messages

Nov 28 17:09:27 bgp_send: sending 19 bytes to 10.217.5.101 (External AS 65471)
Nov 28 17:09:27
Nov 28 17:09:27 BGP SEND 10.217.5.1+179 -> 10.217.5.101+52162
Nov 28 17:09:27 BGP SEND message type 4 (KeepAlive) length 19
Nov 28 17:09:28
Nov 28 17:09:28 BGP RECV 10.217.5.101+52162 -> 10.217.5.1+179
Nov 28 17:09:28 BGP RECV message type 4 (KeepAlive) length 19

open

BGP open packets

Nov 28 18:37:42 bgp_send: sending 37 bytes to 10.217.5.101 (External AS 65471)
Nov 28 18:37:42
Nov 28 18:37:42 BGP SEND 10.217.5.1+179 -> 10.217.5.101+38135
Nov 28 18:37:42 BGP SEND message type 1 (Open) length 37

packets

All BGP protocol packets

Sep 27 17:45:31 BGP RECV 10.0.100.108+179 -> 10.0.100.105+1033
Sep 27 17:45:31 BGP RECV message type 4 (KeepAlive) length 19
Sep 27 17:45:31 bgp_send: sending 19 bytes to 10.0.100.108 (Internal AS 100)
Sep 27 17:45:31 BGP SEND 10.0.100.105+1033 -> 10.0.100.108+179
Sep 27 17:45:31 BGP SEND message type 4 (KeepAlive) length 19
Sep 27 17:45:31 bgp_read_v4_update: receiving packet(s) from 10.0.100.108 (Internal AS 100)

update

Update packets

Nov 28 19:05:24 BGP SEND 10.217.5.1+179 -> 10.217.5.101+55813
Nov 28 19:05:24 BGP SEND message type 2 (Update) length 53
Nov 28 19:05:24 bgp_send: sending 65 bytes to 10.217.5.101 (External AS 65471)
Nov 28 19:05:24
Nov 28 19:05:24 BGP SEND 10.217.5.1+179 -> 10.217.5.101+55813
Nov 28 19:05:24 BGP SEND message type 2 (Update) length 65
Nov 28 19:05:24 bgp_send: sending 55 bytes to 10.217.5.101 (External AS 65471)


Published: 2010-01-25

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