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MPLS Guide
3.18.3 LSPs
The 7705 SAR supports static and dynamic LSPs.
To configure MPLS-signaled (dynamic) LSPs, the LSP must run from an ingress LER
to an egress LER. Configure the dynamic LSP only at the ingress router, and either
configure the LSP to allow the router software to make the forwarding decisions or
configure some or all routers in the LSP path statically. The LSP is set up by
RSVP-TE signaling messages. The 7705 SAR automatically manages label values.
Labels that are automatically assigned have values ranging from 1024 through
1 048 575 (see
A static LSP is a manually configured LSP where the next hop IP address and the
outgoing label are explicitly specified.
To establish a static LSP, an LSP must be configured from an ingress LER to an
egress LER. Labels must be manually assigned and the label values must be within
the range of 32 to 1023 (see
3.18.4 Pseudowires
To configure PW/VLL labels, the PW/VLL service must be configured. PW/VLL labels
can be configured manually as statically allocated labels using any unused label
within the static label range. Pseudowire/VLL labels can also be dynamically
assigned by targeted LDP. Statically allocated labels and dynamically allocated
labels are designated differently in the label information base.
PW/VLL labels are uniquely identified against a 7705 SAR, not against an interface
or module.
As defined in RFC 3036, LDP Specification, and RFC 4447 Pseudowire Setup and
Maintenance Using the Label Distribution Protocol (LDP), label distribution is
handled in the Downstream Unsolicited (DU) mode. Generic Label TLV is used for
all setup and maintenance operations.
3HE 18686 AAAB TQZZA
Label
Values).
Label
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Use subject to Terms available at: www.nokia.com
Values).
MPLS and RSVP-TE
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