bgp enforce-first-asDisable (or enable) enforce-first-as check for updates received from EBGP peers.S4810Syntax bgp enforce-first-asTo turn off the default, use the no bgp enforce-first-as command.Defaults EnabledCommandModesROUTER BGPCommandHistoryThis 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 9.0.2.0 Introduced on the S6000.Version8.3.19.0Introduced on the S4820T.Version 8.3.11.1 Introduced on the Z9000.Version 8.3.7.0 Introduced on the S4810.Version 7.8.1.0 Introduced on the S-Series.Version 7.7.1.0 Introduced on the C-Series.Version 7.4.1.0 Introduced.UsageInformationThis command is enabled by default, that is for all updates received from EBGPpeers, BGP ensures that the first AS of the first AS segment is always the AS of thepeer. If not, the update is dropped and a counter is increments. Use the show ipbgp 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 showip protocols command.In the event of an enfore-first-as check failure, the existing BGP session is flapped.RelatedCommandsshow ip bgp neighbors — views the information the BGP neighbors exchange.show ip protocols — views information on routing protocols.390 Border Gateway Protocol
