Alcatel-Lucent 7450 Manual page 277

record
Syntax [no] record
Context config>router>mpls>lsp>primary
config>router>mpls>lsp>secondary
Description
This command enables recording of all the hops that an LSP path traverses. Enabling record
increases the size of the PATH and RESV refresh messages for the LSP since this information is
carried end-to-end along the path of the LSP. The increase in control traffic per LSP may impact
scalability.
The no form of this command disables the recording of all the hops for the given LSP. There are no
restrictions as to when the no command can be used. The no form of this command also disables the
record-label command.
Default record
record-label
Syntax [no] record-label
Context config>router>mpls>lsp>primary
config>router>mpls>lsp>secondary
Description This command enables recording of all the labels at each node that an LSP path traverses. Enabling
the record-label command will also enable the record command if it is not already enabled.
The no form of this command disables the recording of the hops that an LSP path traverses.
Default record-label
srlg
Syntax [no] srlg
Context config>router>mpls>lsp>secondary
Description This command enables the use of the SRLG constraint in the computation of a secondary path for an
LSP at the head-end LER.
When this feature is enabled, CSPF includes the SRLG constraint in the computation of the
secondary LSP path. This requires that the primary LSP already be established and is up since the
head-end LER needs the most current ERO computed by CSPF for the primary path. CSPF would
return the list of SRLG groups along with the ERO during primary path CSPF computation. At a
subsequent establishment of a secondary path with the SRLG constraint, the MPLS/RSVP task will
query again CSPF providing the list of SLRG group numbers to be avoided. CSPF prunes all links
with interfaces which belong to the same SRLGs as the interfaces included in the ERO of the primary
path. If CSPF finds a path, the secondary is setup. If not, MPLS/RSVP will keep retrying the requests
to CSPF.
7450 ESS MPLS Guide
MPLS and RSVP
Page 277