User Manual
UMN:CLI
V8102
619
12.1.17.2
Peer Group
As the number of external BGP groups increases, the ability to support a large number of
BGP sessions may become a scaling issue. In principle all members of BGP routers with-
in a single AS must connect to other neighboring routers. The preferred way to configure
a large number of BGP neighbors is to configure a few groups consisting of multiple
neighbors per group. Supporting fewer BGP groups generally scales better than support-
ing a large number of BGP groups. This becomes more evident in the case of dozens of
BGP neighboring groups when compared with a few BGP groups with multiple peers in
each group. If the routers belong to same group, they can be applied by same configura-
tion. This group is called as Peer Group.
After peer relationships have been established, the BGP peers exchange update mes-
sage to advertise network reachability information. You can arrange BGP routers into
groups of peers.
To create a BGP Peer Group, use the following command.
Command
Mode
Description
neighbor
NAME
peer-group
Router
Create a BGP peer group.
NAME: peer group name
no neighbor
NAME
peer-group
Delete the BGP peer group created before.
To specify neighbor to the created peer group, use the following command.
Command
Mode
Description
neighbor
{
A.B.C.D |
X:X::X:X
}
peer-group
NAME
Router
Includes BGP neighbor to specified peer group using
IP address.
A.B.C.D: BGP neighbor IP address
X:X::X:X: BGP neighbor IPv6 address
NAME: peer group name
no neighbor
{
A.B.C.D |
X:X::X:X
}
peer-group
NAME
Removes BGP neighbor from the specified Peer
Group.
12.1.17.3
Route Map
You can apply the specific route map on neighboring router that the exchange route in-
formation between routers or blocking the IP address range is configured on route map.
To make BGP Neighbor router exchange the routing information using Route-map, use
the following command.
Command
Mode
Description
neighbor
{
A.B.C.D
|
X:X::X:X
|
WORD
}
route-map
NAME
{
in
|
out
}
Router
Applies a route map to incoming or outgoing routes on
neighboring router or peer group and exchange the
route information.
A.B.C.D: BGP neighbor IP address
X:X::X:X: BGP neighbor IPv6 address
WORD: peer group name
