First changing OSPF hello interval changes the dead interval automatically,
but changing the dead interval don't change the hello- is there a reason
behind this?
but when sub second hellos are configured on a router, changing the dead
interval changes the hello to default.
why it happens so ?
*Initially*-
1 R2(config)#do sh ip ospf int f0/0 | i Time
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
2. R2(config-if)#ip ospf dead-interval 20
R2(config-if)#do sh ip ospf int f0/0 | i Timer
Timer intervals configured, Hello 10, Dead 20, Wait 20, Retransmit 5
3.R2(config-if)#ip ospf dead-interval minimal hello-multiplier 5
R2(config-if)#
*Mar 1 01:07:20.283: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.1 on
FastEthernet0/0 from LOADING to FULL, Loading Done
R2(config-if)#do sh ip ospf int f0/0 | i Timer
Timer intervals configured, Hello 200 msec, Dead 1, Wait 1, Retransmit 5
4. R2(config-if)#do sh ip ospf int f0/0 | i Timer
*Mar 1 01:09:00.939: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.1 on
FastEthernet0/0 from FULL to DOWN, Neighbor Down: Dead timer expired
R2(config-if)#do sh ip ospf int f0/0 | i Timer
Timer intervals configured, Hello 10, Dead 25, Wait 25, Retransmit 5
also correct me if i'm wrong here -- the routers configured with sub
second hellos can have different hello intervals but the dead interval is 1
sec, and even then the adjacency is formed because the advertised hello
interval in this case is 0, in hello packets there fore no violation of the
requirement of same hello/dead intervals in advertised hello packets from
neighbors.
--
thanks
gaurav
http://routing0sand1s.blogspot.com/
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