[quagga-users 14495] Re: Serious BGP issue

Hello,

you could do a tcpdump on the LookingGlass route collector to debug what
has changed between versions. Are the missing prefixes sent? If so what is
the difference (next-hop...)?

tcpdump -nni any "host ip and port 179" -s0 -w /tmp/file.cap

Ngrep and wireshark should help.

2016-11-03 17:08 GMT+01:00 jan hugo prins <[email protected]>:

> As a sidenote, a second router that runs my LookingGlass and is used to
> inject blackhole routes, is also not receiving the full table from the
> BGP02.
> This can be observed at http://lg.as48972.net/
>
> Jan Hugo Prins
>
>
>
> On 11/03/2016 04:36 PM, jan hugo prins wrote:
> > Hi everyone,
> >
> > I have a strange issue.
> > I have 2 external BGP routers. They both have 2 uplinks to my transit
> > providers and this works fine.
> > Until a while ago, when I wanted to take one router out for maintenance,
> > I would shut it's transit links, remove "default-information originate
> > always" from OSPF, set higher costs on the uplink and / or set
> > "max-metric router-lsa administrative"  wait for most of the traffic to
> > shift to the second router and do my maintenance.
> >
> > Because the router would always have an iBGP link to the second router
> > it would receive all routes from this router and be fine in the case of
> > some traffic coming in anyway. But today I wanted to upgrade Quagga to
> > version 1.10 and I saw something really strange:
> >
> > bgp02.as48972.net# sh ip bgp sum
> > BGP router identifier 95.130.232.3, local AS number 48972
> > RIB entries 1120940, using 120 MiB of memory
> > Peers 29, using 129 KiB of memory
> > Peer groups 3, using 96 bytes of memory
> >
> > Neighbor        V         AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down
> > State/P
> > fxRcd
> > 77.222.66.177   4 16243 1434500   11053        0    0    0 01w0d16h
>  609362
> > 78.152.49.109   4  5580 3162545   66219        0    0    0 01w0d16h
>  609733
> > 95.130.232.2    4 48972       0       0        0    0    0 never    Idle
> > (Admin)
> > 95.130.232.4    4 48972   10983   58016        0    0    0 02:28:03
>   0
> > 95.130.232.6    4 48972 2536718   65789        0    0    0 02:21:53
>  137022
> > 193.108.98.2    4 20828  208151   11056        0    0    0 2d09h49m
>  137235
> > 193.108.98.3    4 20828  204274   11056        0    0    0 2d09h39m
>  137227
> >
> > bgp03.as48972.net(config-router)# do sh ip bgp sum
> > BGP router identifier 95.130.232.6, local AS number 48972
> > RIB entries 311015, using 33 MiB of memory
> > Peers 21, using 94 KiB of memory
> > Peer groups 3, using 96 bytes of memory
> >
> > Neighbor        V         AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down
> > State/P
> > fxRcd
> > 77.222.66.181   4 16243  298044     882        0    0    0 00:01:21 Idle
> > (Admin)
> > 78.152.40.92    4  5580  559289    5234        0    0    0 00:01:14 Idle
> > (Admin)
> > 95.130.232.2    4 48972       0       0        0    0    0 never    Idle
> > (Admin)
> > 95.130.232.3    4 48972    7643  867546        0    0    0 02:21:10
> 39002
> > 95.130.232.4    4 48972     837  558695        0    0    0 02:27:21
>   0
> > 193.108.98.2    4 20828   68276     883        0    0    0 03:30:44
>  137235
> > 193.108.98.3    4 20828   64031     883        0    0    0 03:30:35
>  137227
> >
> > I would expect that the BGP03 would get at least 580.000 routes from the
> > BGP02, but this doesn't happen for some strange reason.
> > Also resetting the iBGP link between the BGP02 and BGP03 does not fix
> > the problem.
> >
> > Anyone any idea?
> >
> > jan Hugo Prins
> >
> >
> >
> > _______________________________________________
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> > Quagga-users-UOy77sIEA+cAd7ICUelF/[email protected]
> > https://lists.quagga.net/mailman/listinfo/quagga-users
>
>
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