Fwd: Re: ospf loading for ever...

[Tapio Haapala]

On now I have pcap. I cut it to 1000packets. Looks that when it it on 
this state it can flood packets. this 1000packet sample is only 300ms. 
Last time I did not noticed so mutch flood.
Anyway. All started when my bird A crashed Jun 29 15:25:21 rnrt kernel: 
[5459210.573604] bird[331]: segfault at 40 ip 00a28fb9 sp bfc0b4a0 error 
4 in bird[a23000+4a000]
Any ideas how I can get more info of that?

Then I restart it. I get this state where my table looks this:
on router B
Router ID       Pri          State      DTime   Interface  Router IP
A ip     1      loading/dr     00:10   eth0       10.231.113.1

on router A
Router ID       Pri          State      DTime   Interface  Router IP
10.123.123.113    1         full/dr     00:09   eth0       XXXXXXXXXXXX
10.231.113.113    1         full/bdr    00:10   eth1.1938  10.231.113.113
10.231.101.101    1      loading/dr     00:10   eth1.105   10.231.101.101
10.231.138.138    1         full/dr     00:10   eth1.1255  10.231.138.138

Sorry I sencored public ip:s from these list. If some developer want see 
pcap pleas mail me so I can send it.
There is paste of it:
reading from file eth0.ospf.cut.pcap, link-type EN10MB (Ethernet)
17:08:01.424481 IP (tos 0xc0, ttl 1, id 11162, offset 0, flags [none], 
proto OSPF (89), length 84)
     10.231.113.113 > 224.0.0.5: OSPFv2, LS-Ack, length 64
         Router-ID 10.231.113.113, Backbone Area, Authentication Type: 
none (0)
           Advertising Router 10.231.113.113, seq 0x7fffffff, age 3600s, 
length 16
             External LSA (5), LSA-ID: XXX.XXX.XXX.127
             Options: [none]
           Advertising Router 10.231.113.113, seq 0x7fffffff, age 3600s, 
length 16
             External LSA (5), LSA-ID: XXX.XXX.XXX.130
             Options: [none]
17:08:01.424518 IP (tos 0xc0, ttl 64, id 32570, offset 0, flags [none], 
proto OSPF (89), length 68)
     10.231.113.113 > 10.231.113.1: OSPFv2, LS-Request, length 48
         Router-ID 10.231.113.113, Backbone Area, Authentication Type: 
none (0)
           Advertising Router: 10.231.113.113, External LSA (5), LSA-ID: 
XXX.XXX.XXX..127
           Advertising Router: 10.231.113.113, External LSA (5), LSA-ID: 
XXX.XXX.XXX..130
17:08:01.424612 IP (tos 0xc0, ttl 1, id 11163, offset 0, flags [none], 
proto OSPF (89), length 84)
     10.231.113.113 > 224.0.0.5: OSPFv2, LS-Ack, length 64
         Router-ID 10.231.113.113, Backbone Area, Authentication Type: 
none (0)
           Advertising Router 10.231.113.113, seq 0x7fffffff, age 3600s, 
length 16
             External LSA (5), LSA-ID: XXX.XXX.XXX.127
             Options: [none]
           Advertising Router 10.231.113.113, seq 0x7fffffff, age 3600s, 
length 16
             External LSA (5), LSA-ID: XXX.XXX.XXX.130
             Options: [none]
17:08:01.424629 IP (tos 0xc0, ttl 64, id 32571, offset 0, flags [none], 
proto OSPF (89), length 68)
     10.231.113.113 > 10.231.113.1: OSPFv2, LS-Request, length 48
         Router-ID 10.231.113.113, Backbone Area, Authentication Type: 
none (0)
           Advertising Router: 10.231.113.113, External LSA (5), LSA-ID: 
XXX.XXX.XXX..127
           Advertising Router: 10.231.113.113, External LSA (5), LSA-ID: 
XXX.XXX.XXX..130
17:08:01.424674 IP (tos 0xc0, ttl 1, id 11164, offset 0, flags [none], 
proto OSPF (89), length 84)
     10.231.113.113 > 224.0.0.5: OSPFv2, LS-Ack, length 64
         Router-ID 10.231.113.113, Backbone Area, Authentication Type: 
none (0)
           Advertising Router 10.231.113.113, seq 0x7fffffff, age 3600s, 
length 16
             External LSA (5), LSA-ID: XXX.XXX.XXX.127
             Options: [none]
           Advertising Router 10.231.113.113, seq 0x7fffffff, age 3600s, 
length 16
             External LSA (5), LSA-ID: XXX.XXX.XXX.130
             Options: [none]

On this point I restart both ends and all neighbours of that router and 
problem go away... but I think that if I restart some end it can come back

25.6.2011 11:27, Ondrej Zajicek kirjoitti:
> On Wed, Jun 22, 2011 at 07:56:40PM +0300, Tapio Haapala wrote:
>> I resend this because I forgot complete subscription first. So if this
>> is duplicate message I am sorry.
>> But to the problem:
>>
>> I have similar issue but I dont have multiple ip addresses or mtu problem.
>> Looks that on some cases another side router stuck to loading state and another side is on full state. On this point
>> I must restart this side what says that it is on full state.
>> So looks that some how that router what ways "loading" wait something from that router what says "full"
>> but because this "full" it does not send it any more... Or something :)
>> wierd thing is that even stop and start this router what is on loading state it not help.
>> I must stop and start this router what is on full state.
> Such random problems were common in really old versions, i hoped that we already
> fixed all of them as on my network (~ 120 routes, ~40 routers) i didn't noticed
> that problem for a year. But maybe there are some remaining ones. If you
> encounter that problem, could you make a tcpdump log
> (tcpdump -i IFACE -s 0 -w FILE proto 89) of that interaction and look
> for suspicious messages in BIRD log?
>


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Tapio Haapala

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