Table of Contents
Advertisement
If an LSP is configured with fast-reroute frr-method specified but does not enable CSPF, then neither
global revertive nor local revertive will be available for the LSP to recover.
The no form of the fast-reroute command removes the detour LSP from each node on the primary
path. This command will also remove configuration information about the hop-limit and the
bandwidth for the detour routes.
The no form of fast-reroute hop-limit command reverts to the default value.
Default
no fast-reroute — When fast-reroute is specified, the default fast-reroute method is one-to-one.
Parameters
bandwidth
Syntax
bandwidth rate-in-mbps
no bandwidth
Context
config>router>mpls>lsp>fast-reroute
config>router>mpls>lsp-template>fast-reroute
Description
This command is used to request reserved bandwidth on the detour path. When configuring an LSP,
specify the traffic rate associated with the LSP.
When configuring fast reroute, allocate bandwidth for the rerouted path. The bandwidth rate does not
need to be the same as the bandwidth allocated for the LSP.
Default
no bandwidth — Bandwidth is not reserved for a rerouted path.
Parameters
rate-in-mbps — Specifies the amount of bandwidth in Mbps to be reserved for the LSP path.
7950 SR OS MPLS Configuration Guide
Values
one-to-one — In the one-to-one technique, a label switched path is established
which intersects the original LSP somewhere downstream of the point of link or
node failure. For each LSP which is backed up, a separate backup LSP is
established.
facility — This option, sometimes called many-to-one, takes advantage of the
MPLS label stack. Instead of creating a separate LSP for every backed-up LSP, a
single LSP is created which serves to backup up a set of LSPs. This LSP tunnel is
called a bypass tunnel.
The bypass tunnel must intersect the path of the original LSP(s) somewhere
downstream of the point of local repair (PLR). Naturally, this constrains the set of
LSPs being backed-up via that bypass tunnel to those that pass through a common
downstream node. All LSPs which pass through the PLR and through this common
node which do not also use the facilities involved in the bypass tunnel are
candidates for this set of LSPs.
MPLS and RSVP
Page 277
Advertisement
Chapters
Table of Contents
