From: Ivan (ivan@iip.net)
Date: Thu Aug 31 2006 - 07:06:58 ART
AS1 and AS9 announce 10.34.19.32/28 and 10.34.19.0/28 after peering with R1
shut off AS24 see path to this prefixes through AS567 and 2-a prepends.
*> 10.34.19.0/28 192.168.6.6 0 567 9 9 9 i
*> 10.34.19.32/28 192.168.6.6 0 567 9 9 9 i
> Hi,
> R1 AS 1 peers with R2 AS 24
> R2 peers with R4 AS 24
> R5 AS 256 and R6 AS 256
>
> R5 peers with R2 in AS 24, and R6 peers with R4 in as 24
>
> R6 peers to R9 in AS 9
>
> Both R9 and R1 are advertising the same route.
>
> When I do as path prepend for the routes coming into R6 (from R9) these
> routes dissappears from AS 24.
>
> Is this normal? If I removed the peering to R1 then the bgp routes comes
> back. Any explanation why R4 is not installaing the BGP routes at the same
> time at R4? I guess it has something to do with the AS Path but I need more
> clarification on this matter.
>
> ******NO AS Path prepend at R6 yet*******
> R4#sh ip bgp
> BGP table version is 5, local router ID is 192.168.4.4
> 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
> * 10.34.19.0/28 192.168.6.6 0 567 9 i
> *>i 192.168.1.1 0 100 0 1 i
> *> 10.34.19.0/26 192.168.6.6 0 567 9 i
> * i 192.168.5.5 0 100 0 567 9 i
> * 10.34.19.32/28 192.168.6.6 0 567 9 i
> *>i 192.168.1.1 0 100 0 1 i
> *> 172.16.80.0/27 192.168.6.6 0 567 7 8 ?
> * i 192.168.5.5 0 100 0 567 7 8 ?
> R4#
> *Aug 31 15:39:29.746: %BGP-5-ADJCHANGE: neighbor 192.168.6.6 Down Peer
> closed th e session
> *Aug 31 15:39:29.978: %BGP-5-ADJCHANGE: neighbor 192.168.6.6 Up
>
> **** With AS path prepend at R6*****
> !
> access-list 1 permit 10.34.19.0 0.0.0.15
> access-list 1 permit 10.34.19.16 0.0.0.15
> access-list 1 permit 10.34.19.32 0.0.0.15
> !
> route-map ADDAS permit 10
> match ip address 1
> set as-path prepend 9 9
> !
> ******************************************
> R4#sh ip bgp
> BGP table version is 8, local router ID is 192.168.4.4
> 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
> *>i10.34.19.0/28 192.168.1.1 0 100 0 1 i
> *>i10.34.19.32/28 192.168.1.1 0 100 0 1 i
> *>i172.16.80.0/27 192.168.5.5 0 100 0 567 7 8 ?
>
> ****Turning off the R1 peering******
> R4#sh ip bgp
> BGP table version is 14, local router ID is 192.168.4.4
> 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
> *> 10.34.19.0/28 192.168.6.6 0 567 9 9 9 i
> *> 10.34.19.0/26 192.168.6.6 0 567 9 9 9 i
> *> 10.34.19.32/28 192.168.6.6 0 567 9 9 9 i
> *> 172.16.80.0/27 192.168.6.6 0 567 7 8 ?
> * i 192.168.5.5 0 100 0 567 7 8 ?
>
> TIA,
> Angelo
>
>
>
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-- Ivan
This archive was generated by hypermail 2.1.4 : Fri Sep 01 2006 - 15:41:59 ART