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mandrei99
Post  Post subject: Example of BGP update message sent from Junos device when export policy is modified  |  Posted: Fri Jul 19, 2013 9:09 am

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Example of BGP update message sent from Junos device when export policy is modified

Example of BGP update message sent from Junos device when export policy is modified

On an existing established neighbour, I have changed the export policy to attach a community for two routes. One bgp update message per route. Below is an example.
Code:
Border Gateway Protocol - UPDATE Message
    Marker: ffffffffffffffffffffffffffffffff
    Length: 62
    Type: UPDATE Message (2)
    Unfeasible routes length: 0 bytes
    Total path attribute length: 35 bytes
    Path attributes
        ORIGIN: IGP (4 bytes)
            Flags: 0x40 (Well-known, Transitive, Complete)
            Type code: ORIGIN (1)
            Length: 1 byte
            Origin: IGP (0)
        AS_PATH: empty (3 bytes)
            Flags: 0x40 (Well-known, Transitive, Complete)
            Type code: AS_PATH (2)
            Length: 0 bytes
            AS path: empty
        NEXT_HOP: 172.16.0.34 (7 bytes)
            Flags: 0x40 (Well-known, Transitive, Complete)
            Type code: NEXT_HOP (3)
            Length: 4 bytes
            Next hop: 172.16.0.34 (172.16.0.34)
        MULTI_EXIT_DISC: 20 (7 bytes)
            Flags: 0x80 (Optional, Non-transitive, Complete)
            Type code: MULTI_EXIT_DISC (4)
            Length: 4 bytes
            Multiple exit discriminator: 20
        LOCAL_PREF: 100 (7 bytes)
            Flags: 0x40 (Well-known, Transitive, Complete)
            Type code: LOCAL_PREF (5)
            Length: 4 bytes
            Local preference: 100
        COMMUNITIES: 65518:1111 (7 bytes)
            Flags: 0xc0 (Optional, Transitive, Complete)
            Type code: COMMUNITIES (8)
            Length: 4 bytes
            Communities: 65518:1111
    Network layer reachability information: 4 bytes
        192.168.3.0/24
            NLRI prefix length: 24
            NLRI prefix: 192.168.3.0 (192.168.3.0)





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