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 Figure 1.
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.
Finding Feature Information
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" section.
Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn.An account on Cisco.com is not required.
How to Configure Reuse MAC for ATM Route-Bridge Encapsulation
The Reuse MAC for ATM Route-Bridge Encapsulation configuration is available only in the ATM point-to-point sub-interface mode. Only physical Ethernet interfaces can be used as client interfaces whose MAC address can be used for the ATM P2P sub-interface.
3. interface atmslot/port
4. atm ether-mac-address interface interface-name
5. atm ether-mac-address mac-address
7. show running interface atm slot/port
Command or Action
Enables privileged EXEC mode.
•Enter your password if prompted.
Router# configure terminal
Enters global configuration mode.
Router(config)# interface atm 1/0.1
Specifies the ATM interface to be configured and enters ATM point-to-point sub-interface mode, where:
•slot/port—Specifies the location of the interface
Specifies the interface name whose MAC address can be used to configure the ATM point-to-point sub-interfaces. This is option 1, skip step 5 if you prefer to specify the interface name and not the MAC address.
Note Step 4 and step 5 are exclusive of each other.
Specifies the user defined or explicit MAC address that can be used to configure the ATM point-to-point sub-interfaces. This is option 2, skip step 4 if you prefer to specify the MAC address and not the interface name.
Note Step 4 and step 5 are exclusive of each other.
Returns to the privileged EXEC mode.
show running interface atm slot/port
Router# show running interface atm0/0.000
Displays the configuration.
Configuration Examples for Reuse MAC for ATM Route-Bridge Encapsulation
The following example shows how to configure the Reuse MAC for ATM Route-Bridge Encapsulation feature using an interface:
No new or modified RFCs are supported by this feature.
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Feature Information for Reuse MAC for ATM Route-Bridge Encapsulation
Table 1 lists the release history for this feature.
Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Note Table 1 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.
Table 1 Feature Information for Reuse MAC for ATM Route-Bridge Encapsulation
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 VC on each sub-interface that connects each subscriber to the ISP.
This feature was introduced in Cisco IOS RElease 15.1(1)T. The following commands were introduced: atm ether-mac-address.
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