The confederation peer-as command configures the number of each sub-AS of a confederation.
The undo confederation peer-as command removes the specified sub-AS from the confederation.
By default, no sub-AS number of the confederation is configured.
| Parameter | Description | Value |
|---|---|---|
| as-number |
Specifies an AS number. |
For an integral AS number, the value is an integer ranging from 1 to 4294967295. For an AS number in dotted notation, the value is in the format of x.y, where x and y are integers ranging from 1 to 65535 and from 0 to 65535, respectively. |
Usage Scenario
A large AS may contain a huge number of fully meshed IBGP peer relationships. In this situation, configure a confederation. To configure the number of each sub-AS of the confederation, run the confederation peer-as command.
Prerequisites
A confederation ID has been configured using the confederation id command.
Configuration Impact
The sub-ASs configured in this command belong to the same confederation, and devices in each sub-AS are fully meshed.
Precautions
The old speaker with a 2-byte AS number and the new speaker with a 4-byte AS number cannot exist in the same confederation. AS4_Path does not support the confederation. If a 2-byte AS number and a 4-byte AS number co-exist in the same confederation, routing loops may occur, and the sub-AS numbers in the confederation may be transmitted out of the confederation.
If a confederation ID is configured and the command is run, all the TCP connections of the BGP peer relationships established using the sub-AS numbers specified in the command are torn down, and the BGP peer relationships are reestablished. Therefore, exercise caution when running this command.