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One BGP neighbor won't advertise its TokenRing subnet

RouterJ and RouterH are connected on a b2b PPP link, 215.0.0.18/30 (J) and .17(30)H. H is connected to an up-and-running TokenRing segement, 10.4.4.0/24. H's BGP config looks like this:

router bgp 50

bgp log-neighbor-changes

network 10.4.4.0

neighbor 215.0.0.18 remote-as 100

but its table contains only the 4 loopbacks being advertised to it by J

RouterH#sh ip bgp

BGP table version is 49, local router ID is 215.0.0.17

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path

*> 205.1.12.0 215.0.0.18 0 0 100 i

*> 205.1.13.0 215.0.0.18 0 0 100 i

*> 205.1.14.0 215.0.0.18 0 0 100 i

*> 205.1.15.0 215.0.0.18 0 0 100 i

RouterH#

going over to Router J, we have a BGP config of:

router bgp 100

network 205.1.12.0

network 205.1.13.0

network 205.1.14.0

network 205.1.15.0

neighbor 215.0.0.17 remote-as 50

!

and a bgp table of:

RouterJ#sh ip bgp

BGP table version is 5, local router ID is 205.1.15.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path

*> 205.1.12.0 0.0.0.0 0 32768 i

*> 205.1.13.0 0.0.0.0 0 32768 i

*> 205.1.14.0 0.0.0.0 0 32768 i

*> 205.1.15.0 0.0.0.0 0 32768 i

RouterJ#

The 10.4.4.0/24 network was declared on H's BGP process and the segment is up and running, so why is it not being advertised over to J?

2 REPLIES
New Member

Re: One BGP neighbor won't advertise its TokenRing subnet

Dear sir,

Could you told me if summarization enabled or not under BGP process on router H.

Hall of Fame Super Bronze

Re: One BGP neighbor won't advertise its TokenRing subnet

Make sure to have auto-summary disabled under BGP and also have this command instead,

network 10.4.4.0 mask 255.255.255.0

HTH,

__

Edison.

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