Command Line 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 increments. Use the show ip bgp neighbors command to view the

“failed enforce-first-as check” counter.

If you disable the enforce-first-as command, it can be viewed using the show ip

protocols command.

Commands

show ip bgp neighbors – views the 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.