host1(config)#interface atm 4/0.1
host1(config-if)#mpls backup-path bypass56
4. On LER 1 (the tunnel ingress), specify that local protection is required for the primary
tunnel.
host1(config)#interface tunnel mpls:primary1
host1(config-if)#tunnel mpls fast-reroute
Fast Reroute over SONET/SDH
If you are using MPLS fast reroute over a SONET/SDH interface, reduce the times that
the router uses to convert a defect to an alarm. Use the path trigger delay command to
reduce the time for the path layer and the trigger delay command to reduce the time
for the section and line layers. Use the following guidelines to set the times:
•
Specify a value of 0 milliseconds if the interface does not use APS/MSP or if you want
MPLS to have priority over APS/MSP.
•
Specify a value of at least 100 milliseconds if this interface uses APS/MSP and if you
want APS/MSP to have priority over MPLS.
Related Topics Basic MPLS Configuration Tasks on page 276•
• Additional RSVP-TE Configuration Tasks on page 293
• For more information about these commands,see JunosE Physical Layer Configuration
Guide
• mpls backup-path
• tunnel mpls fast-reroute
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:
•
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.
To configure the RSVP-TE hello feature on all RSVP-TE interfaces in the VR:
1. Issue the mpls rsvp signalling hello command.
297Copyright © 2010, Juniper Networks, Inc.
Chapter 4: Configuring MPLS
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