Solved: IP Phone restart during OSPF convergation

Harutyun Hakobyan · ‎04-28-2014

Hi all,

Between Head office and Branch we have two VPN tunnels: main and backup. As IGP we are using OSPF. When I shut down main VPN tunnel, OSPF installs routes through backup VPN which takes aproximately 2-3 seconds. During that time IP Phones (Alcatel-Lucent) are restarting and we lose phone connection ~1minute.

So what to do, that IP Phones stay connected?

Thanks

acampbell · ‎04-28-2014

Hi,

You will need to investigate if you can adjust the ip phone keep-a-live

time between your IP phone server & the ip phones.

Sounds like the timer is set at around 3 seconds if you could increase that to 10 seconds

that will give ospf time to converge.

Hope this helps

Regards

Alex

Regards, Alex. Please rate useful posts.

View solution in original post

acampbell · ‎04-28-2014

Hi,

You will need to investigate if you can adjust the ip phone keep-a-live

time between your IP phone server & the ip phones.

Sounds like the timer is set at around 3 seconds if you could increase that to 10 seconds

that will give ospf time to converge.

Hope this helps

Regards

Alex

Regards, Alex. Please rate useful posts.

Harutyun Hakobyan · ‎04-28-2014

Thank you acampbell for reply.

Dear minkdennis, while OSPF is converging down time will be 3 seconds, but not ~1 minute, when ip phone restarts.

Dennis Mink · ‎04-28-2014

Even if you were to keep the phones registered by changing the keep alive, that would still mean that while your routing protocol is converging, you cannot use your phones because signalling is impossible.

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