MPLS and RSVP-TE
198
MPLS Guide
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3HE 18686 AAAB TQZZA
Description This command configures the maximum number of labels that the ingress LER can push for
an SR-TE LSP.
This command is used to allow room to insert additional transport, service, and other labels
when packets are forwarded in a context.
The max-sr-labels label-stack-size value should reflect the desired maximum label stack of
the primary path of the SR-TE LSP.
The value in additional-frr-labels labels should reflect additional labels inserted by remote
LFA for the backup next hop of the SR-TE LSP.
The sum of both label values represents the worst-case transport of SR label stack size for
this SR-TE LSP. The sum is populated by MPLS in the Tunnel Table Manager (TTM) so that
services and shortcut applications can check the TTM to determine whether a service can be
bound or a route can be resolved to this SR-TE LSP.
The maximum label stack supported by the router is always signaled by the PCC in the PCEP
Open object as part of the SR-PCE-CAPABILITY TLV. The maximum label stack is referred
to as the Maximum Stack Depth (MSD).
In addition, the per-LSP value for the max-sr-labels option, if configured, is signaled by the
PCC to the PCE in the Segment-ID (SID) Depth value in a METRIC object for both a
PCE-computed LSP and a PCE-controlled LSP. The PCE will compute and provide the full
explicit path with TE links specified. If there is no path with the number of hops lower than the
MSD value or the SID Depth value (if signaled), a reply with no path will be returned to the
PCC.
For a PCC-controlled LSP, if the label stack returned by the TE-DB hop-to-label translation
exceeds the per-LSP maximum label stack size for the SR, the LSP is brought down.
Default max-sr-labels 6
additional-frr-labels 1
Parameters label-stack-size — specifies the label stack size of the primary path of the SR-TE LSP
Values 1 to 11
Default 6
additional-frr-labels labels — sets the number of additional labels inserted by remote
LFA for the backup next hop of the SR-TE LSP
Values 0 to 4
Default 1
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