Reference Guide

Command
History
This guide is platform-specific. For command information about other platforms,
refer to the relevant Dell Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS 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-failover
Enable the fast external failover feature, which immediately resets the BGP session if a link to a directly
connected external peer fails.
S5000
Syntax
bgp fast-external-failover
To disable fast external failover, use the no bgp fast-external-failover
command.
Defaults Enabled
Command
Modes
ROUTER BGP
Command
History
Version 9.0(1.3) Introduced on the S5000.
IPv6 Border Gateway Protocol (IPv6 BGP)
1075