Carrier Access 770-0125-AB User Manual

Before you can add an interface to a bridge group, you should first create the bridge virtual interface 
(BVI) which attaches the bridge-group to the IP router. There is a one-to-one mapping between a 
BVI and a bridge-group; each BVI supports a single bridge-group. The BVI has an IP address which 
it utilizes to route its bridged traffic into the IP router and which can also be used to manage the 
BROADway system by performing the manage-intf enable command on the BVI. 

You can enable and configure both Network Address Translation (NAT) and the DHCP relay agent 
on a BVI interface.

To create a BVI, use the following PS commands:

PS#configure

PS(NSP-config)#interface bvi 

PS(NSP-config-bvi)#ip address 

<address> <mask>

—The number of the bridge virtual interface. You should use the same number 

that was configured for the bridge group.

—The IP address of the interface.

—The network mask for the interface.

You must create a bridge group before creating the BVI.

For example, to create a bridge group, map the Ethernet interface to the bridge group, associate the 
bridge group with a BVI, assign an IP address to the BVI and enable the BVI IP address as a 
management interface for the system:

NSP1>ps

PS#configure

PS(NSP-config)#bridge addgroup 1

PS(NSP-config)#interface ethernet 0

PS(NSP-config-if)#bridge-group 1

PS(NSP-config-if)#exit

PS(NSP-config)#interface bvi 1

PS(NSP-config-bvi)#ip address 192.9.200.1 255.255.255.0

PS(NSP-config-bvi)#manage-intf enable

To delete a BVI use the following PS commands:

PS#configure

PS(NSP-config)#no interface bvi 1

To change the state of the BVI to “down”, use the following PS commands:

PS#configure

PS(NSP-config)#interface bvi 1

PS(NSP-config-bvi)#shutdown