I am trying to reduce my convergence time for BGP running over a PoS line. The timers are set to 30 and 90, and the provider will not change them. 90 seconds is WAY to long to wait.
I have heard that the pos delay triggers path command will cause BGP to bypass its normal hold timer and start to converge after the amount of time set in that command...provided I also had Fast-External-Failover turned on (which is on by default).
So, for instance, if I used pos delay triggers path 120 and the circuit went down (creating a POS PATH AIS), will BGP still wait the 90 seconds, or will it only wait 120ms?
Just trying to wrap my head around this one.
Thanks, and points will be liberally handed out!
here a link the pos delay
pos delay defends the router from a flapping interface by waiting some msec before accepting the SDH alarm and putting the inteface down.
if you use fast-external-fallover the BGP convergence time is the time to detect that the link is down and shouldn't be the hold time.
No more then 3 times the L2 keepalive interval (30 seconds) in a normal link in a POS you can take advantage from SDH alarms.
Hope to help