Users Guide

Version Description
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. Added support for the 4-byte format
Usage Information
To accept 4-byte formats before entering a 4-byte AS number, configure your system. All the routers in the
Confederation must be 4 byte or 2 byte identified routers. You cannot mix them.
The autonomous systems configured 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 configured, BGP does not allow for the configuration of BGP confederation. Similarly, if BGP
confederation is configured, then BGP does not allow the configuration of local-as.
If the neighbor is an eBGP neighbor, then BGP performs a check on the first AS number. In this scenario, it is
mandatory that the first sequence in the AS path is of type AS_SEQUENCE or AS_CONFED_SEQUENCE (in the
case of confederations). If the first 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 configuration to take effect.
Related
Commands
• bgp four-octet-as-support — enable 4-byte support for the BGP process.
bgp confederation peers
Specify the autonomous systems (ASs) that belong to the BGP confederation.
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 configured.
Command Modes ROUTER BGP
Command History
This guide is platform-specific. For command information about other platforms, see the relevant Dell Networking
OS Command Line Reference Guide.
Version Description
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.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
318 Border Gateway Protocol