Juniper BGP, Configuration Manual

Page: 326 / 748

You can use the tunnel mpls path-option command to configure path options on
the bypass tunnel. However, the link being protected by the bypass tunnel must not
be in the path if you specify an explicit path.
Configuration Example
The following steps show a partial configuration using the topology in Figure 63 on
page 289:
1.
On LSR 5, create a bypass tunnel to protect the link between LSR 5 and LSR 6.
If you configure path options, you can specify the explicit path for the bypass
tunnel either statically or to be dynamically calculated by the IGP traffic
engineering mechanism.
host1(config)# interface tunnel mpls:bypass56
host1(config-if)# tunnel mpls path-option 1 explicit name bypass
host1(config-if)# tunnel destination 172.20.1.1
host1(config-if)# exit
2.
On LSR 5, enable the explicit path, if configured.
host1(config)# mpls explicit-path name bypass enable
host1(config-expl-path)# next-address 10.10.9.2
host1(config-expl-path)# exit
3.
On LSR 5, assign the bypass tunnel to the interface being protected.
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 268
■
Additional RSVP-TE Configuration Tasks on page 286
290 ■
Configuring RSVP-TE Fast Rerouting with RSVP-TE Bypass Tunnels
JUNOSe 11.1.x BGP and MPLS Configuration Guide