IP Router Configuration
Router Configuration Guide 45
The user must set resolution to filter to activate the list of tunnel-types configured under
resolution-filter.
If disallow-igp is enabled, the static route will not be activated using IP next-hops in RTM if
no tunnel next-hops are found in TTM.
Static Route ECMP Support
The following is the ECMP behavior of a static route:
• ECMP is supported when resolving in RTM multiple static routes of the same prefix
with multiple user-entered indirect IP next-hops. The system picks as many direct
next-hops as available in RTM beginning from the first indirect next-hop and up to
the value of the ecmp option in the system.
• ECMP is also supported when resolving in TTM a static route to a single indirect
next-hop using a LDP tunnel when LDP has multiple direct next-hops.
• ECMP is supported when resolving in TTM a static route to a single indirect next-
hop using a RSVP-TE tunnel type when there is more than one RSVP LSP with the
same lowest metric to the indirect next-hop.
• ECMP is supported when resolving in TTM a static route to a single indirect next-
hop using a list of user configured RSVP-TE LSP names when these LSPs have the
same metric to the indirect next-hop.
• ECMP is supported when resolving in TTM multiple static routes of the same prefix
with multiple user-entered indirect next-hops each binding to a tunnel type. The
system picks as many tunnel next-hops as available in TTM beginning from the first
indirect next-hop and up to the value of the ecmp option in the system. The spraying
of flow packets is performed over the entire set of resolved next-hops which
correspond to the selected indirect next-hops.
• ECMP is supported when resolving concurrently in RTM and TTM multiple static
routes of the same prefix with multiple user entered indirect tunnel next-hops. There
is no support for mixing IP and tunnel next-hops for the same prefix using different
indirect next-hops. Tunnel next-hops preferred over IP next-hops.
Weighted Load-Balancing over MPLS LSP
The weighted load-balanced, or weighted-ecmp, feature sprays packets of IGP, BGP, and
static route prefixes resolved to a set of ECMP tunnel next-hops proportionally to the weights
configured for each MPLS LSP in the ECMP set.
Weighted load-balancing is supported in the following forwarding contexts:
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