H3C Technologies H3C S12500-X Series Switches - Manual (Page 252)

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Step Command Remarks
1. Enter system view. system-view N/A
2. Enter BGP view or BGP-VPN
instance view.
• Enter BGP view:
bgp as-number
• Enter BGP-VPN instance view:
a. bgp as-number
b. ip vpn-instance
vpn-instance-name
N/A
3. Ignore the ORIGINATOR_ID
attribute. peer { group-name |
ipv6-address } ignore-originatorid
By default, BGP does not ignore
the ORIGINATOR_ID attribute.
Make sure this command does not
result in a routing loop.
After you execute this command,
BGP also ignores the
CLUSTER_LIST attribute.
338B
Configuring a BGP confederation
BGP confederation provides another way to reduce IBGP connections in an AS.
A confederation contains sub-ASs. In each sub-AS, IBGP peers are fully meshed. Sub-ASs establish EBGP
connections in between.
601B
Configuring a BGP confederation
After you split an AS into multiple sub-ASs, configure a router in a sub-AS as follows:
1. Enable BGP and specify the AS number of the router. For more information, see "
1157H
Enabling BGP ."
2. Specify the confederation ID. From an outsider's perspective, the sub-ASs of the confederation is
a single AS, which is identified by the confederation ID.
3. If the router needs to establish EBGP connections to other sub-ASs, you must specify the peering
sub-ASs in the confederation.
A confederation can contain a maximum of 32 sub-ASs. The AS number of a sub-AS is effective only in
the confederation.
To configure a BGP confederation:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter BGP view. bgp as-number N/A
3. Configure a confederation ID. confederation id as-number
By default, no confederation ID is
configured.
4. Specify peering sub-ASs in the
confederation.
confederation peer-as
as-number-list By default, no peering sub-AS is
specified.