Administrator Guide
This command must be performed on the router which is attaching link bandwidth to prexes (typically a border
router) as well as the router which is expected to load share trac proportional to the bandwidth of the external
links.
bgp enforce-rst-as
Disable (or enable) enforce-rst-as check for updates received from EBGP peers.
Syntax
bgp enforce-first-as
To turn o the default, use the no bgp enforce-first-as command.
Defaults Enabled
Command Modes ROUTER BGP
Command History
This guide is platform-specic. For command information about other platforms, see the relevant Dell Networking
OS Command Line Reference Guide.
Version Description
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.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
7.8.1.0 Introduced on the S-Series.
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 rst
AS of the rst 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-rst-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-rst-as check failure, the existing BGP session is apped.
Related Commands
• show ip bgp neighbors — view the information the BGP neighbors exchange.
• show ip protocols — view information on routing protocols.
Border Gateway Protocol 361