Reference Guide

bgp enforce-first-as
Disable (or enable) enforce-first-as check for updates received from EBGP peers.
Z9000
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
This guide is platform-specific. For command information about other platforms, refer to the
relevant Dell FTOS Command Line Reference Guide .
The following is a list of the FTOS version history for this command.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.4.2.1 Introduced on the C-Series and S4810.
Version 8.2.1.0 Introduced on the E-Series ExaScale.
Version 7.4.1.0 Introduced on the E-Series TeraScale.
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.
bgp fast-external-fallover
Enable the fast external fallover feature, which immediately resets the BGP session if a link to a directly connected
external peer fails.
Z9000
Syntax
bgp fast-external-fallover
To disable fast external fallover, use the no bgp fast-external-fallover command.
Defaults Enabled.
Command Modes ROUTER BGP
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