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Label Distribution Protocol
If IGP shortcuts are used, they must be enabled under the OSPF or IS-IS routing
protocol. As well, they must be enabled under the MPLS LSP context, using the
command config>router>mpls>lsp>igp-shortcut.
For information on LFA and IGP shortcut support for OSPF and IS-IS, refer to the
7705 SAR Routing Protocols Guide, "LDP and IP Fast Reroute for OSPF Prefixes"
and "LDP and IP Fast Reroute for IS-IS Prefixes".
Both LDP FRR and IP FRR are supported; for information on IP FRR, refer to the
7705 SAR Router Configuration Guide, "IP Fast Reroute (FRR)".
5.1.14 LDP-to-Segment Routing Stitching for IPv4 /32
This feature provides stitching between an LDP FEC and an SR node SID route for
the same IPv4 /32 IS-IS prefix by allowing the export of SR tunnels from the Tunnel
Table Manager (TTM) to LDP (IGP). In the LDP-to-SR data path direction, the LDP
tunnel table route export policy supports the exporting of SR tunnels from the TTM
to LDP.
A route policy option is configured to support LDP-to-SR stitching using the
config>router>policy-options context. Refer to the 7705 SAR Router
Configuration Guide, "Configuring LDP-to-Segment Routing Stitching Policies", for a
configuration example and to "Route Policy Command Reference" for information on
the commands that are used.
After the route policy option is configured, the SR tunnels are exported from the TTM
into LDP (IGP) using the config>router>ldp>export-tunnel-table command. See
LDP Command Reference
When configuring a route policy option, the user can restrict the exporting of SR
tunnels from the TTM to LDP from a specific prefix list by excluding the prefix from
the list.
The user can also restrict the exporting of SR tunnels from the TTM to a specific IS-IS
IGP instance by specifying the instance ID in the from protocol statement. The from
protocol statement is valid only when the protocol value is isis. Policy entries with
any other protocol value are ignored when the route policy is applied. If the user
configures multiple from protocol statements in the same policy or does not include
the from protocol statement but adds a default-action of accept, then LDP routing
uses the lowest instance ID in the IS-IS protocol to select the SR tunnel.
388
Prefixes (IS-IS)
Use subject to Terms available at: www.nokia.com
for more information on this command.
© 2022 Nokia.
MPLS Guide
3HE 18686 AAAB TQZZA
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