a stab in the dark: on R1 BGP-
a)is auto-summary enabled? or perhaps b)aggregate-addr with summary-only? ./Randy --- On Wed, 2/27/13, Jerry Bacon <[email protected]> wrote: > From: Jerry Bacon <[email protected]> > Subject: Re: [c-nsp] BGP route won't advertise > To: [email protected] > Date: Wednesday, February 27, 2013, 4:07 PM > On 2/27/2013 3:47 PM, Jay Hennigan > wrote: > > On 2/27/13 3:24 PM, Jerry Bacon wrote: > > > >> R1#sh ip bgp a.b.c.0/22 > >> BGP routing table entry for a.b.c.0/22, version > 406152 > >> Bestpath Modifiers: always-compare-med, > deterministic-med > >> Paths: (1 available, best #1) > >> Not advertised to any peer > >> 11xx1 > >> x.y.z.242 (metric 143360) from > x.y.z.242 (x.y.z.242) > >> Origin IGP, metric 0, > localpref 100, valid, internal, best > >> > >> None of the issues that I have been able to find > that might cause this > >> behaviour seem to apply. Any ideas on what more to > look for? > > No IGP route to x.y.z.242 from R1 and BGP > synchronization enabled? > > Prefix-list or AS-path filter list on your EBGP > neighbor on R1? > > Next hop of R3 not reachable from EBGP neighbor (need > next-hop-self?) > > No-export community getting applied by a route-map? > > I'm using EIGRP as my IGP, synchronization is disabled, and > there is a good route to R3: > > R1#sh ip rou x.y.z.242 > Routing entry for x.y.z.242/32 > Known via "eigrp 100", distance 170, metric 143360, > type external > Redistributing via eigrp 100 > Last update from 10.1.25.130 on > GigabitEthernet2/0.283, 16:44:58 ago > Routing Descriptor Blocks: > * 10.1.25.130, from 10.1.25.130, 16:44:58 ago, via > GigabitEthernet2/0.283 > Route metric is 143360, traffic share > count is 1 > Total delay is 5020 microseconds, > minimum bandwidth is 172413 Kbit > Reliability 255/255, minimum MTU 1514 > bytes > Loading 23/255, Hops 2 > > I've tried with and without next-hop-self on R3, it doesn't > seem to make any difference. > > On R1, I have: > > ip as-path access-list 16 permit ^$ > ip as-path access-list 16 permit ^11xx1 > ip as-path access-list 16 deny _11xx1_ > ip as-path access-list 16 permit .* > > On R4, I have: > > ip as-path access-list 10 permit ^11xx1 > ip as-path access-list 10 deny _11xx1_ > ip as-path access-list 10 permit .* > > I had to do this to keep from doing transit of other routes > from this customer. > > -- Jerry Bacon > Senior Network Engineer > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
