Users 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.
S4820T
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, 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 Description
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 — views the information the BGP neighbors exchange.
show ip protocols — views information on routing protocols.
Border Gateway Protocol
353