[quagga-users 14494] Re: Serious BGP issue

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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