Configuring IP Router Parameters
44 Router Configuration Guide
If tunnel-next-hop context is configured and resolution is set to disabled, the binding to
tunnel is removed and resolution resumes in RTM to IP next-hops.
If resolution is set to any, any supported tunnel type in static route context will be selected
following TTM preference.
The following tunnel types are supported in a static route context: RSVP-TE, LDP, Segment
Routing (SR) Shortest Path, and Segment Routing Traffic Engineering (SR-TE).
•LDP
The ldp value instructs the code to search for an LDP LSP with a FEC prefix
corresponding to the address of the indirect next-hop.
• RSVP-TE
The rsvp-te value instructs the code to search for the set of lowest metric RSVP-TE
LSPs to the address of the indirect next-hop. The LSP metric is provided by MPLS
in the tunnel table. The static route treats a set of RSVP-TE LSPs with the same
lowest metric as an ECMP set.
The user has the option of configuring a list of RSVP-TE LSP names to be used
exclusively instead of searching in the tunnel table. In that case, all LSPs must have
the same LSP metric in order for the static route to use them as an ECMP set.
Otherwise, only the LSPs with the lowest common metric value are selected.
A P2P auto-lsp that is instantiated via an LSP template can be selected in TTM when
resolution is set to any. However, it is not recommended to configure an auto-lsp
name explicitly under the rsvp-te node as the auto-generated name can change if the
node reboots, which will blackhole the traffic of the static route.
• SR Shortest Path
When the sr-isis or sr-ospf value is enabled, an SR tunnel to the indirect next-hop is
selected in the TTM from the lowest preference ISIS or OSPF instance, and if many
instances have the same lowest preference, it is selected from the lowest numbered
IS-IS or OSPF instance.
•SR-TE
The sr-te value instructs the code to search for the set of lowest metric SR-TE LSPs
to the address of the indirect next-hop. The LSP metric is provided by MPLS in the
tunnel table. The static route treats a set of SR-TE LSPs with the same lowest metric
as an ECMP set.
The user has the option of configuring a list of SR-TE LSP names to be used
exclusively instead of searching in the tunnel table. In that case, all LSPs must have
the same LSP metric in order for the static route to use them as an ECMP set.
Otherwise, only the LSPs with the lowest common metric value are selected.
If one or more explicit tunnel types are specified using the resolution-filter option, then only
these tunnel types will be selected again following the TTM preference.
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