IP Router Configuration
Router Configuration Guide 103
confederation
Syntax confederation confed-as-num members as-number [as-number...up to 15 max]
no confederation [confed-as-num members as-number...up to 15 max]
Context config>router
Description This command creates confederation autonomous systems within an AS.
This technique is used to reduce the number of IBGP sessions required within an AS. Route reflection
is another technique that is commonly deployed to reduce the number of IBGP sessions.
The no form of the command deletes the specified member AS from the confederation.
When no members are specified in the no statement, the entire list is removed and confederation is
disabled.
When the last member of the list is removed, confederation is disabled.
Default no confederation - no confederations are defined.
Parameters confed-as-num — The confederation AS number expressed as a decimal integer.
Values 1 to 65535
members member-as-num — The AS number(s) of members that are part of the confederation,
expressed as a decimal integer. Up to 15 members per confed-as-num can be configured.
Values 1 to 65535
ecmp
Syntax ecmp max-ecmp-routes
no ecmp
Context config>router
Description This command enables ECMP and configures the number of routes for path sharing; for example, the
value 2 means two equal cost routes will be used for cost sharing.
ECMP can only be used for routes learned with the same preference and same protocol.
When more ECMP routes are available at the best preference than configured in max-ecmp-routes,
then the lowest next-hop IP address algorithm is used to select the number of routes configured in max-
ecmp-routes.
The no form of the command disables ECMP path sharing. If ECMP is disabled and multiple routes
are available at the best preference and equal cost, then the route with the lowest next-hop IP address
is used.
Default no ecmp
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