Huawei Quidway S3500 Series Operation Manual page 239

Operation Manual - Routing Protocol
Quidway S3500 Series Ethernet Switches
5.2.16 Configuring BGP AS Confederation Attribute
Confederation provides the method to handle the booming IBGP network connections
inside AS. It divides the AS into multiple sub-AS, in each of which all IBGP peers are
fully connected, and are connected with other sub-AS of the confederation.
The shortcomings of confederation: it is required that the route be re-configured upon
switching from non-confederation to confederation solution, and that the logic topology
be basically changed. Furthermore, the path selected via confederation may not be the
best path if there is no manually-set BGP policy.
I. Configuring confederation_ID
In the eye of the BGP speakers that are not included in the confederation, multiple
sub-ASs that belong to the same confederation are a whole. The external network does
not need to know the status of internal sub-ASs, and the confederation ID is the AS
number identifying the confederation as a whole.
Perform the following configurations in BGP view.
Table 5-35 Configuring confederation_ID
Configure confederation_ID
Canceling confederation_ID
By default, the confederation_ID is not configured.
II. Configuring sub-AS belonging to the confederation
Configure confederation_ID first, and then configure the sub-AS belonging to the
confederation. One confederation includes up to 32 sub-AS. The as-number used upon
configuring sub-AS belonging to the confederation is valid within the confederation.
Perform the following configurations in BGP view.
Table 5-36 Configuring sub-AS belonging to the confederation
Configure
consisting of which sub-ASs
Cancel the specified sub-AS in
the confederation
By default, no autonomous system is configured as a member of the confederation.
Operation
Operation
a confederation
Huawei Technologies Proprietary
Command
confederation id as-number
undo confederation id
Command
confederation peer-as
as-number-n ]
undo confederation peer-as [ as-number-1 ]
[ ...as-number-n ]
5-21
Chapter 5 BGP Configuration
as-number-1 [ ...