Service Manual

Version Description
9.2(1.0) Introduced on the Z9500.
Usage Information
Conguring or un-conguring the command brings down and brings up the BGP Route Manager, this results in
tear down and re-establishment of all active sessions.
Link Bandwidth has to be congured on the router to tell it to associate Link Bandwidth with prexes (paths)
and/or to use Link Bandwidth in BGP Multipath route selection.
This is done under BGP conguration and is supported per address family – for IPv4 and IPv6 address families.
The conguration for a particular address family applies across all VRFs congured.
This command must be performed on the router which is attaching link bandwidth to prexes (typically a border
router) as well as the router which is expected to load share trac 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-specic. 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.
Border Gateway Protocol 353