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    Configure BGP-Specific Options

    Purpose

    When unexpected events or problems occur, or if you want to diagnose BGP establishment issues, you can view more detailed information by configuring options specific to BGP. You can also configure tracing for a specific BGP peer or peer group. For more information, see the Junos System Basics Configuration Guide.

    1. Display Detailed BGP Protocol Information
    2. Diagnose BGP Session Establishment Problems

    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)


    Diagnose BGP Session Establishment Problems

    Purpose

    To trace BGP session establishment problems.

    Action

    To trace BGP session establishment problems, follow these steps:

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

      For example:

      [edit protocols bgp]user@host# show
      traceoptions { file bgplog size 10k files 10; flag open 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]user@hotst# run show log bgplog
      Sep 17 17:13:14 trace_on: Tracing to "/var/log/bgplog" started
      Sep 17 17:13:14 bgp_read_v4_update: done with 201.0.0.2 (Internal AS 10458) received 19 octets 0 updates 0 routes
      Sep 17 17:13:15 bgp_read_v4_update: receiving packet(s) from 201.0.0.3 (Internal AS 10458)
      Sep 17 17:13:15 bgp_read_v4_update: done with 201.0.0.3 (Internal AS 10458) received 19 octets 0 updates 0 routes
      Sep 17 17:13:44 bgp_read_v4_update: receiving packet(s) from 201.0.0.2 (Internal AS 10458)
      [...Output truncated...]

    Published: 2013-02-25

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