WB 1 Section 7.8

Hi All,

When i checked routes learned from R2 on SW4 i got below given o/p

 

Rack1SW4#sh ip bgp 205.90.31.0

BGP routing table entry for 205.90.31.0/24, version 15

Paths: (1 available, best #1, table Default-IP-Routing-Table)

  Not advertised to any peer

  200 254

    155.1.0.2 (metric 2174976) from 155.1.58.5 (150.1.5.5)

      Origin incomplete, metric 0, localpref 100, valid, internal, best

 

My question is why cluster-id is not added in these updates ....i am missing something or this is normal bgp behaviour?

Comments

  • I would check on R5 to make sure you have SW4 configured as a route-reflector-client.

     

    show ip bgp 150.1.10.10 pol

     

    Nick

  • Hi All,

    When i checked routes learned from R2 on SW4 i got below given o/p

    Rack1SW4#sh ip bgp 205.90.31.0

    BGP routing table entry for 205.90.31.0/24, version 15

    Paths: (1 available, best #1, table Default-IP-Routing-Table)

      Not advertised to any peer

      200 254

        155.1.0.2 (metric 2174976) from 155.1.58.5 (150.1.5.5)

          Origin incomplete, metric 0, localpref 100, valid, internal, best

     

    My question is why cluster-id is not added in these updates ....i am missing something or this is normal bgp behaviour?

    Cluster-id is not shown if the RR is advertising its directly connected network to ther client or if you have any kind of issue in RR configuration. I think you should check for the RR configuration & make sure that the route is advertised by RR has cluster-id as shown below:

    Here is the example.

    R3---R1---R2

    R1(config-router)#do sh run | sec router bgp

    router bgp 100

     network 150.1.11.11 mask 255.255.255.255

     neighbor 150.1.2.2 remote-as 100

     neighbor 150.1.2.2 update-source Loopback0

     neighbor 150.1.2.2 route-reflector-client

     neighbor 150.1.3.3 remote-as 100

     neighbor 150.1.3.3 update-source Loopback0

     neighbor 150.1.3.3 route-reflector-client

     no auto-summary


    R2#sh ip bgp 150.1.11.11

    BGP routing table entry for 150.1.11.11/32, version 17

    Paths: (1 available, best #1, table Default-IP-Routing-Table)

      Not advertised to any peer

      Local

        150.1.1.1 (metric 11) from 150.1.1.1 (150.1.11.11)

          Origin IGP, metric 0, localpref 100, valid, internal, best


    R2#sh ip bgp 150.1.33.33

    BGP routing table entry for 150.1.33.33/32, version 16

    Paths: (1 available, best #1, table Default-IP-Routing-Table)

      Not advertised to any peer

      Local

        150.1.3.3 (metric 21) from 150.1.1.1 (150.1.11.11)

          Origin IGP, metric 0, localpref 100, valid, internal, best

          Originator: 150.1.3.3, Cluster list: 150.1.11.11

     

    HTH

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