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Dell PowerEdge FN I/O Module Command Line Reference Guide 9.10(0.0)

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bgp enforce-first-as

Disable (or enable) enforce-first-as check for updates received from EBGP peers.

Syntax

bgp enforce-first-as

To turn off the default, use the no bgp enforce-first-as command.

Defaults

Enabled.

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 10/40GbE Switch IO Module.

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. To view the failed enforce-first-as check counter, use the show ip bgp ipv6 unicast neighbors command.

If you disable enforce-first-as, view it 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.