Configuring a bgp confederation, Configuring confederation compatibility, Configuring bgp gr – H3C Technologies H3C S5560 Series Switches User Manual
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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.
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 "
."
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 confederation peer
sub-ASs in the confederation.
confederation peer-as
as-number-list
By default, no confederation peer
sub-AS is specified.
Configuring confederation compatibility
If any routers in the confederation do not comply with RFC 3065, enable confederation compatibility to
allow the router to work with those routers.
To configure confederation compatibility:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter BGP view.
bgp as-number
N/A
3.
Enable confederation
compatibility.
confederation nonstandard
By default, confederation
compatibility is disabled.
Configuring BGP GR
Graceful Restart (GR) ensures forwarding continuous when a routing protocol restarts or an
active/standby switchover occurs. Two routers are required to complete a GR process. The following are
router roles in a GR process:
•
GR restarter—Performs GR upon a BGP restart or active/standby switchover.