Reference Guide

bgp enforce-first-as
Disable (or enable) enforce-first-as check for updates received from EBGP peers.
S5000
Syntax
bgp enforce-first-as
To turn off the default, use the no bgp enforce-first-as command.
Defaults Enabled.
Command
Modes
ROUTER BGP
Command
History
Version 9.0(1.3) Introduced on the S5000.
Usage
Information
This is enabled by default; that is, for all updates received from EBGP peers, BGP
ensures that the first AS of the first AS segment is always the AS of the peer. If not,
the update is dropped and a counter is incremented. Use the show ip bgp ipv6
unicast neighbors
command to view the failed enforce-first-as check counter.
If you disable enforce-first-as, it can be viewed using the show ip
protocols
command.
Related
Commands
show ip bgp ipv6 unicast neighbors – displays IPv6 routing information exchanged
by BGP neighbors.
show ip protocols – views information on routing protocols.
bgp fast-external-failover
Enable the fast external failover feature, which immediately resets the BGP session if a link to a directly
connected external peer fails.
S5000
Syntax
bgp fast-external-failover
To disable fast external failover, use the no bgp fast-external-failover
command.
Defaults Enabled
Command
Modes
ROUTER BGP
Command
History
Version 9.0(1.3) Introduced on the S5000.
IPv6 Border Gateway Protocol (IPv6 BGP)
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