Reuse MAC for ATM Route-Bridge Encapsulation

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information for Reuse MAC for ATM Route-Bridge Encapsulation.

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When multiple hosts are connected to the Customer Premises Equipment (CPE) that in turn communicate to the Internet Service Provider (ISP) through the Broadband Remote Access Server (BRAS), the hosts are connected to the CPE through Ethernet and legacy ATM between the CPE and the BRAS, and aggregation using DSL Access Multiplexer (DSLAM).

In a standard setup, hosts are connected to the BRAS through sub-interfaces. A host sends a DHCP request to get its IP address from the DHCP server (can be the BRAS), and when the IP address is assigned, the packets start flowing with the IP. The ATM interface in the CPE is configured with Route-Bridge Encapsulation (RBE) to enable packets from the hosts to be bridged across the ATM connection as shown in the figure below.

Figure 1

Sample Topology for Reuse MAC for ATM Route-Bridge Encapsulation

The Reuse MAC for ATM Route-Bridge Encapsulation feature provides for a configurable MAC address for ATM point-to-point sub-interfaces, with the single virtual circuit (VC) on each sub-interface that connects each subscriber to the ISP.

1.    enable

2.    configure terminal

3.    interface atm slot/port

4.    atm ether-mac-address interface-name

5.    atm ether-mac-address mac-address

6.    end

7.    show running interface atm slot /port

The following example shows how to configure the Reuse MAC for ATM Route-Bridge Encapsulation feature using an interface:

Router> enable
Router# configure terminal
Router(config)# interface atm 3/0.100 point-to-point
Router(config-subif)# atm ether-mac-address interface fastEthernet 0/0
Router(config-subif)# end

The following example shows how to configure the Reuse MAC for ATM Route-Bridge Encapsulation feature using an MAC address for the ATM point-to-point sub-interface:

Router> enable
Router# configure terminal
Router(config)# interface atm 3/0.100 point-to-point
Router(config-subif)# atm ether-mac-address 00a1.0b65.87bc

Router(config-subif)# end

3. You can use the show run interface atm slot/port command to display the configuration:

Router# show run interface atm0/0.000
Current configuration : 188 bytes
!
interface ATM3/0.100 point-to-point
 atm route-bridged ip
 atm ether-mac-address interface FastEthernet0/0
 no atm enable-ilmi-trap
 pvc 1/100 
 !
end