Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 409)

explicitly configured for the neighbor. If you do not set a neighbor parameter in the peer group and the
parameter also is not set for the individual neighbor, the neighbor uses the default value.
Peer group configuration rules
The following rules apply to peer group configuration:
• You must configure a peer group before you can add neighbors to the peer group.
• If you remove a parameter from a peer group, the value for that parameter is reset to the default for
all the neighbors within the peer group, unless you have explicitly set that parameter on individual
neighbors. In this case, the value you set on the individual neighbors applies to those neighbors,
while the default value applies to neighbors for which you have not explicitly set the value.
NOTE
If you enter a command to remove the remote AS parameter from a peer group, the software makes
sure that the peer group does not contain any neighbors. If the peer group contains neighbors, the
software does not allow you to remove the remote AS so that the neighbors in the peer group that are
using the remote AS do not lose connectivity to the device.
You can override neighbor parameters that do not affect outbound policy on an individual neighbor
basis:
• If you do not specify a parameter for an individual neighbor, the neighbor uses the value in the peer
group.
• If you set the parameter for the individual neighbor, that value overrides the value you set in the peer
group.
• If you add a parameter to a peer group that already contains neighbors, the parameter value is
applied to neighbors that do not already have the parameter explicitly set. If a neighbor has the
parameter explicitly set, the explicitly set value overrides the value you set for the peer group.
• If you remove the setting for a parameter from a peer group, the value for that parameter changes to
the default value for all the neighbors in the peer group that do not have that parameter individually
set.
Configuring a peer group
To configure a peer group, enter commands such as the following at the BGP4 configuration level.
device(config-bgp-router)# neighbor PeerGroup1 peer-group
device(config-bgp-router)# neighbor PeerGroup1 description "EastCoast Neighbors"
device(config-bgp-router)# neighbor PeerGroup1 remote-as 100
device(config-bgp-router)# neighbor PeerGroup1 distribute-list out 1
device(config-bgp-router)# neighbor PeerGroup1 capability as4 enable|disable
The commands in this example configure a peer group called "PeerGroup1" and set the following
parameters for the peer group:
• A description, "EastCoast Neighbors"
• A remote AS number, 100
• A distribute list for outbound traffic
• The capability of PeerGroup1 to utilize a four-byte AS number
The software applies these parameters to each neighbor you add to the peer group. You can override
the description parameter for individual neighbors. If you set the description parameter for an individual
neighbor, the description overrides the description configured for the peer group.
Syntax: neighbor peer-group-name peer-group
Peer group configuration rules
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