IP Router Configuration
7705 SAR OS Router Configuration Guide 39
ECMP for IP allows load balancing to be configured across all IP interfaces at the system
level or interface level on the network side. IP ECMP has the option to include Layer 4 port
attributes and/or the TEID (tunnel endpoint identifier) attribute in the hashing algorithm.
Configuration at the interface level overrides the system-level settings for the specific
interface.
IP ECMP is supported on all 7705 SAR adapter cards and platforms.
Interfaces on the system can have any mixture of load-balancing configurations, including
having load balancing disabled. Router updates often cause interface load balancing
configuration changes. The 7705 SAR will automatically continue processing packets using
the new interface configuration.
ECMP is configured on the interface but is agnostic to the underlying SAP, spoke SDP, or
VPLS binding. ECMP configuration is maintained even if the binding type changes.
If multiple routes are learned with an identical preference using the same protocol, the
lowest-cost route is used. If multiple routes are learned with an identical preference using the
same protocol and the costs (metrics) are equal, the decision of which route to use is
determined by the configuration of ECMP.
For information on configuring the 7705 SAR for LSR ECMP with the lsr-load-
balancing command, see Router Interface Commands and the 7705 SAR OS Basic
System Configuration Guide, “System Information and General Commands”.
For information on configuring the 7705 SAR for IP ECMP with the l4-load-
balancing and teid-load-balancing commands, see Router Interface Commands,
the 7705 SAR OS Basic System Configuration Guide, “System Information and General
Commands”, and the 7705 SAR OS Services Guide, “IES Command Reference” and “VPRN
Services Command Reference”.
Preferences are set on static routes in the config>router>static-route context.
Preferences are set on OSPF routes in the config>router>ospf context, on RIP routes
in the config>router>rip context, on IS-IS routes in the config>router>isis>
level context, and on BGP routes in the config>router>bgp context (refer to the
7705 SAR OS Routing Protocols Guide for OSPF, IS-IS, and BGP configuration).
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