[Xorp-hackers] OSPF on high latency links

[Atanu Ghosh]

Hi,

Just out of curiosity what kind of links do you have that can have a
latency of 20 seconds?

For two OSPF routers to maintain bidirectional communications each must
receive a hello packet from the other at least every
router-dead-interval (default 40 seconds), a hello packet is sent every
hello-interval (default 10 seconds).

Are you experiencing packet loss as well as high latencies? If you are
you could try increasing the frequency of the hello packets by
decreasing the hello-interval value and also increasing the
router-dead-interval.

      Atanu.

>>>>> "Jon" == Jon  <jonirucoeith at gmail.com> writes:

    Jon> Hi all,

    Jon> I have a problem with ospf loosing connection over high latency links.
    Jon> The link in question will induce a delay from minimum 1 sec to a
    Jon> maximum of more than 20 sec. (Yes, such links do exist:-/ )

    Jon> I have tried to set the hello and router-dead intervals to 60 and 240
    Jon> respectivly, but I still loose the connection.

    Jon> I have also tried to manipulate transmit-delay and retransmit in order
    Jon> to handle the latency (20 and 90secs) but no luck so far.

    Jon> Can anybody tell me why this happens, or at least what I can do to
    Jon> make ospf a bit more forgiving about delayed packages (If that is the
    Jon> problem...)?

    Jon> Thanks in advance,

    Jon> Jon
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