Tuesday, January 7, 2020

Improving speed of OSPF neighbor detection

Hello,

We use OSPF for all of our internal nodes in our WISP network. It's reliable and helps route around power outages or lightning strikes.

We use mainly Airfiber5XHD and Airfiber5 equipment, with some 24/60Ghz links as well. Each POP/Tower has at least one Edgerouter.

While the OSPF cost metric varies inversely based on the link capacity, the other parameters we've set are the same everywhere, this from our Vyatta configs:

set interfaces ethernet eth0 ip ospf retransmit-interval 5 set interfaces ethernet eth0 ip ospf transmit-delay 1 set interfaces ethernet eth0 ip ospf dead-interval 40 set interfaces ethernet eth0 ip ospf hello-interval 10 set interfaces ethernet eth0 ip ospf priority 1

Sometimes links take a while to renegotiate, and in the worst cases even if a broken link has come back, we may require hard rebooting both ends just to merge back into the OSPF topology.

Looking for advice here, does anyone have suggestions on how to tweak our OSPF settings or make use of the data carrier drop options in Airfiber5XHD to improve OSPF healing time? TIA--



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