Service Manual

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
Border Gateway Protocol 446