Configuring Bgp Gr; Configuring A Bgp Confederation - 3Com S7906E Configuration Manual

Configuring a BGP Confederation

Configuring a BGP confederation is another way for reducing iBGP connections in an AS.
A confederation contains sub ASs. In each sub AS, iBGP peers are fully meshed. Between sub ASs,
eBGP connections are established.
If routers not compliant with RFC 3065 exist in the confederation, you can use the confederation
nonstandard command to make the local router compatible with these routers.
Configure a BGP confederation
After you split an AS into multiple sub ASs, you can configure a router in a sub AS in the following way:
1) Enable BGP and specify the AS number of the router.
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 need to specify the
peering sub ASs in the confederation.
A confederation contains 32 sub ASs at most. The AS number of a sub AS is effective only in the
confederation.
Follow these steps to configure a BGP confederation:
Enter system view
Enter BGP view
Configure a confederation ID
Specify peering sub ASs in the
confederation
Configure confederation compatibility
If some other routers in the confederation do not comply with RFC 3065, you need to enable
confederation compatibility to allow the router to work with those routers.
Enter system view
Enter BGP view
Enable compatibility with routers not
compliant with RFC 3065 in the
confederation

Configuring BGP GR

Perform the following configuration on the GR Restarter and GR Helper respectively.
To do...
To do...
Use the command...
system-view
bgp as-number
confederation id as-number
confederation peer-as
as-number-list
Use the command...
system-view
bgp as-number
confederation nonstandard
1-41
Remarks
—
—
Required
Not configured by
default.
Required
Not configured by
default.
Remarks
—
—
Optional
Not enabled by default