[Xorp-users] OSPF Hello messages not exchanged after some period, and link status becomes dead

Ben Greear greearb at candelatech.com
Tue Mar 23 09:33:00 PDT 2010

On 03/23/2010 12:41 AM, Dejan Petkovic wrote:
> Hello,
> I am running multiple XORP OSPF routers on OpenVZ virtual machines.
> When I start the xorp routers on all virtual machines, the links go up
> and OSPF adjacencies are established. However, after some time, both
> parameters Pri and Dead in the show ospf4 neighbor command output give
> value 0, and the link status is down.
> I have set on host and virtual machines forwarding and proxy_arp
> settings to 1. I have set that hello interval is 10 seconds, and that
> router dead interval is 200 seconds.
> When I restart the xorp instances running on virtual machines, the
> adjacencies are again established and the routers can ping each other.
> I suspect the arp issue here, as the arp table of the nodes on which
> the XORP is running becomes empty at the moment when hello messages
> stop to arrive to the appropriate xorp routers. However, if it was an
> arp issue, xorp restart shouldn't affect the behavior?
> The sample configuration of two adjacent routers is pasted below. Only
> IPs would differ. Where am I making a mistake? Perhaps I have not
> configured correctly the link between these two routers (Please
> neglect the fact that I used C class there)?

What version of xorp are you using?

Please send us output of these cmds for both nodes
when it is in failure mode.

ip ru show
ip route show
ip addr show
ip neigh show

You could try sniffing to see if arp requests are being properly
sent/received and see if they are being answered.


Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com

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