Bgp Enforce-First-As - Dell S4810 Reference Manual

bgp enforce-first-as

Disable (or enable) enforce-first-as check for updates received from EBGP peers.
S4810
Syntax
bgp enforce-first-as
To turn off the default, use the no bgp enforce-first-as command.
Defaults Enabled
Command ROUTER BGP
Modes
Command
This guide is platform-specific. For command information about other platforms,
History
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 9.0.2.0
Version
8.3.19.0
Version 8.3.11.1
Version 8.3.7.0
Version 7.8.1.0
Version 7.7.1.0
Version 7.4.1.0
Usage
This command is enabled by default, that is for all updates received from EBGP
Information
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
show ip bgp neighbors
Commands
show ip protocols
390
Introduced on the S6000.
Introduced on the S4820T.
Introduced on the Z9000.
Introduced on the S4810.
Introduced on the S-Series.
Introduced on the C-Series.
Introduced.
— views the information the BGP neighbors exchange.
— views information on routing protocols.
Border Gateway Protocol