Specifications

mpls traffic-eng fast-reroute backup-prot-preemption
MP-317
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
mpls traffic-eng fast-reroute backup-prot-preemption
To change the backup protection preemption algorithm to minimize the amount of bandwidth that is
wasted, use the mpls traffic-eng fast-reroute backup-prot-preemption command in global
configuration mode. To use the default algorithm of minimizing the number of label-switched paths
(LSPs) that are demoted, use the no form of this command.
mpls traffic-eng fast-reroute backup-prot-preemption [o
ptimize-bw]
no mpls traffic-eng fast-reroute backup-prot-preemption
Syntax Description
Command Default A minimum number of LSPs are preempted.
Command Modes Global configuration
Command History
Usage Guidelines The mpls
traffic-eng fast-reroute backup-prot-preemption command allows you to determine the
criteria the router will use when selecting the LSPs that will be preempted.
If you enter the command with the o
ptimize-bw keyword, the router chooses LSPs that will waste the
least amount of bandwidth.
If you do not enter the mpls t
raffic-eng fast-reroute backup-prot-preemption optimize-bw command,
the router preempts as few LSPs as possible.
Each router in the network does not have to use the same algorithm; that is, you can specify o
ptimize-bw
for some routers in the network but not for others.
You can enter the mpls t
raffic-eng fast-re-route backup-prot-preemption command at any time. If
you change the algorithm, it does not affect LSPs that already are protected. It only affects the placement
of new LSPs signaled after you enter this command. The command can affect LSPs during the next
periodic promotion cycle.
Examples In the following examples, a next-next hop (NNHOP) backup tunnel has the following characteristics:
• Total backup capacity: 240 units
• Used backup bandwidth: 220 units
• Available backup bandwidth: 20 units
optimize-bw (Optional) Minimizes the amount of bandwidth wasted.
Release Modification
12.0(29)S This command was introduced.
12.2(33)SRA This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.4(20)T This command was integrated into Cisco IOS Release 12.4(20)T.