Brocade Communications Systems FastIron SX 1600, Руководство по настройке, Страница: 375 / 593

• Perform soft-outbound resets (the device updates outgoing route information to neighbors but does not entirely reset the
sessions with those neighbors)
• Clear BGP4 message statistics
• Clear error buffers
Peer group parameters
You can set all neighbor parameters in a peer group. When you add a neighbor to the peer group, the neighbor receives all the parameter
settings you set in the group, except parameter values you have 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
Basic configuration tasks required for BGP4
FastIron Ethernet Switch Layer 3 Routing
53-1003627-04 375