Defaults

Command Modes

Command History

Usage Information

Related Commands

Enabled

ROUTER BGP

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.

VersionDescription

9.7(0.0)

Introduced on the S6000–ON.

9.0.2.0Introduced on the S6000.

8.3.19.0Introduced on the S4820T.

8.3.11.1Introduced on the Z9000.

8.3.7.0Introduced on the S4810.

7.8.1.0Introduced on the S-Series.

7.7.1.0Introduced on the C-Series.

7.4.1.0Introduced.

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-ascommand, 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.

show ip bgp neighbors — views the information the BGP neighbors exchange.

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.

S6000

Syntax

bgp fast-external-fallover

 

To disable fast external fallover, use the no bgp fast-external-fallover

 

command.

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Border Gateway Protocol

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Dell 9.7(0.0) manual Bgp fast-external-fallover