Users Guide

Version Description
7.7.1.0 Introduced on the C-Series. Added support for the 4-byte format
Usage Information
To accept 4-byte formats before entering a 4-byte AS number, congure your system. All the routers in the
Confederation must be 4 byte or 2 byte identied routers. You cannot mix them.
The autonomous systems congured in this command are visible to the EBGP neighbors. Each autonomous
system is fully meshed and contains a few connections to other autonomous systems. The next hop, MED,
and local preference information is preserved throughout the confederation.
Dell Networking OS accepts confederation EBGP peers without a LOCAL_PREF attribute. The software
sends AS_CONFED_SET and accepts AS_CONFED_SET and AS_CONF_SEQ.
If a local-as is congured, BGP does not allow for the conguration of BGP confederation. Similarly, if BGP
confederation is congured, then BGP does not allow the conguration of local-as.
If the neighbor is an eBGP neighbor, then BGP performs a check on the rst AS number. In this scenario, it
is mandatory that the rst sequence in the AS path is of type AS_SEQUENCE or AS_CONFED_SEQUENCE
(in the case of confederations). If the rst entry appears as an AS_CONFED_SET and the neighbor is not in
the local AS, then this is strictly a problem with the neighbor node.
This command automatically restarts the BGP instance for the conguration to take eect.
Related Commands
bgp four-octet-as-support — enables 4-byte support for the BGP process.
bgp confederation peers
Specify the autonomous systems (ASs) that belong to the BGP confederation.
S4820T
Syntax
bgp confederation peers as-number [...as-number]
To return to the default, use the no bgp confederation peers command.
Parameters
as-number Enter the AS number. The range is from 0 to 65535 (2 byte), from 1 to
4294967295 (4 byte), or from 0.1 to 65535.65535 (dotted format).
...as-number (OPTIONAL) Enter up to 16 confederation numbers. The range is from 0 to 65535
(2 byte), from 1 to 4294967295 (4 byte), or from 0.1 to 65535.65535 (dotted
format).
Defaults Not congured.
Command Modes ROUTER BGP
Command History
This guide is platform-specic. 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.
Border Gateway Protocol
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