Alcatel-Lucent 7450 Configuration Manual page 114

Router Global Commands
Description
This command configures the autonomous system (AS) number for the router. A router can only
belong to one AS. An AS number is a globally unique number with an AS. This number is used to
exchange exterior routing information with neighboring ASs and as an identifier of the AS itself.
If the AS number is changed on a router with an active BGP instance, the new AS number is not used
until the BGP instance is restarted either by administratively disabling/enabling (shutdown/
no shutdown) the BGP instance or rebooting the system with the new configuration.
Default
No autonomous system number is defined.
Parameters autonomous-system — The autonomous system number expressed as a decimal integer.
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.
members member-as-num — The AS number(s) of members that are part of the confederation,
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.
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Values
1 — 4294967295
Values 1 — 65535
expressed as a decimal integer. Up to 15 members per confed-as-num can be configured.
Values
1 — 65535
7450 ESS Router Configuration Guide