API Guide

Version Description
9.7(0.0) Introduced on the S-Series.
9.2(1.0) Introduced on the Z9500.
Usage
Information
Configuring or un-configuring 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 configured on the router to tell it to associate Link Bandwidth with prefixes
(paths) and/or to use Link Bandwidth in BGP Multipath route selection.
This is done under BGP configuration and is supported per address family – for IPv4 and IPv6 address
families.
The configuration for a particular address family applies across all VRFs configured.
This command must be performed on the router which is attaching link bandwidth to prefixes (typically a
border router) as well as the router which is expected to load share traffic proportional to the bandwidth
of the external links.
bgp enforce-first-as
Disable (or enable) enforce-first-as check for updates received from EBGP peers.
Syntax
bgp enforce-first-as
To turn off the default, use the no bgp enforce-first-as command.
Defaults Enabled
Command Modes ROUTER BGP
Command
History
This guide is platform-specific. For command information about other platforms, see the relevant Dell
EMC Networking OS Command Line Reference Guide.
Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.10(0.0) Introduced on the S3148.
9.8(2.0) Introduced on the S3100 series.
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 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.
352 Border Gateway Protocol