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Configuring RSVP-TE Hello Messages to Determine Peer Reachability
The RSVP-TE hello feature enables RSVP-TE peers to exchange hello messages and
establish a hello adjacency. The peers use the adjacency to verify reachability. When
a peer is no longer reachable, the LSPs that traverse the neighbor are torn down.
High refresh values reduce the amount of control traffic (and CPU cycles) needed by
RSVP-TE to refresh LSP state across the network, reducing the impact of RSVP-TE
on system resources:
To configure the RSVP-TE hello feature on all RSVP-TE interfaces in the VR:
1.
2.
3.
To configure the RSVP-TE hello feature on a RSVP-TE specific interface:
1.
2.
3.
4.
For more information about these commands,see JUNOSe Physical Layer
Configuration Guide
mpls backup-path
tunnel mpls fast-reroute
A hello refresh interval of 1000 milliseconds (a rate of one hello every second)
is appropriate for a small configuration tens of interfaces without causing
performance degradation.
For larger configurations, the default hello refresh interval of 10,000 milliseconds
(a rate of one hello every 10 seconds) is more appropriate and typically does not
cause performance degradation.
Issue the mpls rsvp signalling hello command.
host1:vr5(config)#mpls rsvp signalling hello
(Optional) Configure the refresh interval.
host1(config-if)#mpls rsvp signalling hello refresh interval 5000
(Optional) Configure the refresh misses.
host1(config-if)#mpls rsvp signalling hello refresh misses 5
Access the interface.
host1(config)#interface fastEthernet 4/3
Issue the mpls rsvp signalling hello command.
host1(config-if)#mpls rsvp signalling hello
(Optional) Configure the refresh interval.
host1(config-if)#mpls rsvp signalling hello refresh interval 5000
(Optional) Configure the refresh misses.
Configuring RSVP-TE Hello Messages to Determine Peer Reachability
Chapter 3: Configuring MPLS
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Troubleshooting
