CLI Guide

Version Description
7.7.1.0 Introduced on the C-Series.
7.4.1.0 Introduced.
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. Use the show ip
bgp neighbors command to view the “failed enforce-first-as check” counter.
If you disable the enforce-first-as command, it can be viewed using the show
ip protocols
command.
In the event of an enfore-first-as check failure, the existing BGP session is flapped.
Related
Commands
• show ip bgp neighbors — view the information the BGP neighbors exchange.
• show ip protocols — view 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.
Syntax
bgp fast-external-fallover
To disable fast external fallover, use the no bgp fast-external-fallover
command.
Defaults Enabled
Command Modes ROUTER BGP
Command History
This guide is platform-specific. For command information about other platforms,
see the relevant Dell Networking OS Command Line Reference Guide.
Version Description
9.8(2.0) Introduced on the S3100 series.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000–ON.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
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Border Gateway Protocol