CLI Guide

Command Modes ROUTER BGP

Supported Modes Full–Switch

Command History

Version Description

9.9(0.0) Introduced on the FN IOM.

9.2(0.0) Introduced on the MXL 10/40GbE Switch IO Module.

Usage Information

This command 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. To view the “failed

enforce-first-as check” counter, use the show ip bgp neighbors command.

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 the BGP neighbors exchange.

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.

Syntax

bgp fast-external-failover

To disable fast external failover, use the no bgp fast-external-failover

command.

Defaults Enabled