i am trying to set up TE tunnels with Fast Reroute protection. As i am using FastEthernet and GigabitEthernet links i need to use RSVP Hello for link or node failure detection.
I have a little problem understanding and properly configuring the rsvp hello feature. The topology looks as follows:
PE1 - P1 - PE2
P3 ----------- P4
I am trying to set up fast reroute to protect the connection PE1-P1-PE2 with backup path PE1-P3-P4-PE2. Both primary and backup tunnels are set up and working. I configure RSVP Hello on the link between PE1 and P1 with following commands on PE1 and P1:
State: Up (Since: 2012 January Wednesday 11 23:43:18 )
LSPs protecting: 3
Missed acks: 4, IP DSCP: 0x30
Refresh Interval (msec)
The configuration guide for IOS 12.2SR refers to active instances:
If a neighbor is unreachable when an LSP is ready to be fast rerouted, an active Hello instance is needed. Create an active Hello instance for each neighbor with at least one LSP in this state.
and to passive instances:
Passive Hello instances respond to Hello Request messages (sending Ack messages), but do not initiate Hello Request messages and do not cause LSPs to be fast rerouted.
At this point i am not sure if i configured the RSVP Hello properly. After shuting the interface FastEthernet 0/0 on P1 down i do get the backup tunnel active and rerouted, but the convergence time is too slow. I would expect the convergence time to be 4xRSVP Hello interval which is 4x50=200ms. However, the testing revealed the convergence time to be round 2,5 seconds. My goal is to get the convergence time under 300ms.
The question is, what is the actual difference between active and passive rsvp hello session? What does the Clients statement in the sh ip rsvp hello instance detail command mean and shoud i see the same interval on both ends of the link?
If you need any other specification, i will provide any other show command outputs necessary.
Would it be possible to post the relevant tunnel configurations from your PE routers? From what you described, I am not sure if you want to achieve an MPLS path protection, MPLS link protection (NHOP) or MPLS node protection (NNHOP) here.
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