Users Guide

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(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.
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
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.
After specifying autonomous systems numbers for the BGP confederation, recycle the peers to update
their configuration.
Related
Commands
● bgp confederation identifier — configure a confederation ID.
290 Border Gateway Protocol