From: Peter McCreesh (petermccreesh@gmail.com)
Date: Mon Nov 21 2005 - 19:00:31 GMT-3
Hi,
Synchronisation is turned on in the R1 bgp config. If it doesn't see a route
to the destination in its IGP routing table, it won't install it in its BGP
table.
Regards,
Pete
On 11/21/05, Big guy <jenseike@start.no> wrote:
>
> Hi ,
>
> Look at this strange thing that is happening to bgp..
> The aggregate is coming from r6
>
> R6
>
> router bgp 2
> no synchronization
> bgp log-neighbor-changes
> aggregate-address 198.168.0.0 <http://198.168.0.0>
255.255.224.0<http://255.255.224.0>summary-only
> neighbor 150.100.2.254 <http://150.100.2.254> remote-as 100
> neighbor 152.1.4.4 <http://152.1.4.4> remote-as 2
> neighbor 152.1.4.4 <http://152.1.4.4> update-source Loopback0
> neighbor 152.1.4.4 <http://152.1.4.4> next-hop-self
> neighbor 152.1.4.4 <http://152.1.4.4> password CISCO
>
> R4
>
> router bgp 2
> no synchronization
> bgp router-id 4.4.4.4 <http://4.4.4.4>
> bgp log-neighbor-changes
> neighbor 152.1.1.1 <http://152.1.1.1> remote-as 2
> neighbor 152.1.1.1 <http://152.1.1.1> update-source Loopback0
> neighbor 152.1.1.1 <http://152.1.1.1> route-reflector-client
> neighbor 152.1.1.1 <http://152.1.1.1> password CISCO
> neighbor 152.1.6.6 <http://152.1.6.6> remote-as 2
> neighbor 152.1.6.6 <http://152.1.6.6> update-source Loopback0
> neighbor 152.1.6.6 <http://152.1.6.6> route-reflector-client
> neighbor 152.1.6.6 <http://152.1.6.6> password CISCO
> neighbor 152.1.5.5 <http://152.1.5.5> remote-as 2
> neighbor 152.1.5.5 <http://152.1.5.5> update-source Loopback0
> neighbor 152.1.5.5 <http://152.1.5.5> route-reflector-client
> neighbor 152.1.5.5 <http://152.1.5.5> password CISCO
> no auto-summary
>
> R5
>
> router bgp 2
> no synchronization
> bgp router-id 5.5.5.5 <http://5.5.5.5>
> bgp log-neighbor-changes
> neighbor 152.1.4.4 <http://152.1.4.4> remote-as 2
> neighbor 152.1.4.4 <http://152.1.4.4> update-source Loopback0
> neighbor 152.1.4.4 <http://152.1.4.4> next-hop-self
> neighbor 152.1.4.4 <http://152.1.4.4> password CISCO
> no auto-summary
>
> R1
>
> router bgp 2
> synchronization
> bgp router-id 1.1.1.1 <http://1.1.1.1>
> bgp log-neighbor-changes
> neighbor 152.1.4.4 <http://152.1.4.4> remote-as 2
> neighbor 152.1.4.4 <http://152.1.4.4> update-source Loopback0
> neighbor 152.1.4.4 <http://152.1.4.4> next-hop-self
> neighbor 152.1.4.4 <http://152.1.4.4> password CISCO
> no auto-summary
>
>
> And then look at the bgp table on r1 and r5
>
> Rack1R5#sh ip bg
> BGP table version is 40, local router ID is 5.5.5.5 <http://5.5.5.5>
> Status codes: s suppressed, d damped, h history, * valid, > best, i -
> internal,
> r RIB-failure, S Stale
> Origin codes: i - IGP, e - EGP, ? - incomplete
>
> Network Next Hop Metric LocPrf Weight Path
> *> 152.1.30.2 <http://152.1.30.2> 0 0 1 i
> *>i192.168.0.0/19 152.1.6.6 <http://152.1.6.6> 0 100 0 i
>
>
>
> Rack1R1#sh ip bg
> BGP table version is 4, local router ID is 1.1.1.1 <http://1.1.1.1>
> Status codes: s suppressed, d damped, h history, * valid, > best, i -
> internal,
> r RIB-failure, S Stale
> Origin codes: i - IGP, e - EGP, ? - incomplete
>
> Network Next Hop Metric LocPrf Weight Path
> * i192.168.0.0/19 152.1.6.6 <http://152.1.6.6> 0 100 0 i
>
> Rack1R1#
>
>
>
> Why does not the prefixes (192.168.0.0 <http://192.168.0.0>) show as
> "best" on r1 as on r5 that
> has exact same config as r5...
> Have you seen this, or can you understand what is happening here...
>
> There are no acl, filtering or anything from r4
>
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