Reference Guide

402 | Border Gateway Protocol
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bgp enforce-first-as
c e
Disable (or enable) enforce-first-as check for udates 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
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 neighbors command to view the “failed enforce-first-as check
counter.
If enforce-first-as is disabled, it can be viewed via the show ip protocols command.
Related
Commands
Command
History
bgp fast-external-fallover
c e
Enable the fast external fallover feature, which immediately resets the BGP session if a link to a
directly connected external peer fails.
Syntax
bgp fast-external-fallover
To disable fast external fallover, enter no bgp fast-external-fallover.
Defaults
Enabled
Command Modes
ROUTER BGP
Command
History
Usage
Information
The bgp fast-external-fallover command appears in the show config command output.
show ip bgp neighbors View the information exchanged by BGP neighbors
show ip protocols View Information on routing protocols.
Version 8.2.1.0 Introduced on E-Series ExaScale
Version 7.4.1.0 Introduced
Version 8.2.1.0 Introduced on E-Series ExaScale
Version 7.4.1.0 Introduced