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Cisco 10000 Series Router Software Configuration Guide
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Chapter 21 Configuring L2VPN Interworking
Ethernet/VLAN to ATM AAL5 Interworking
• ATM AAL5 to Ethernet Local Switching—Bridged Interworking, page 21-8
• ATM AAL5 to VLAN 802.1Q Local Switching—Bridged Interworking, page 21-9
• ATM AAL5 to Ethernet Port AToM—Bridged Interworking, page 21-9
• ATM AAL5 to Ethernet VLAN 802.1Q AToM—Bridged Interworking, page 21-10
• ATM to Ethernet—Routed Interworking, page 21-11
• Configuration Tasks and Examples, page 21-12
Prerequisites of Ethernet/VLAN to ATM AAL5 Interworking
Before you configure Ethernet/VLAN to ATM AAL5 Interworking on a network, you must enable
Cisco
Express Forwarding.
Restrictions of Ethernet/VLAN to ATM AAL5 Interworking
In Cisco IOS Release 12.2(33)SB, the Ethernet/VLAN to ATM AAL5 local switching has the following
restrictions:
• The following translations are only supported and other translations are dropped:
–
Ethernet without LAN FCS (AAAA030080C200070000)
–
Spanning tree (AAAA030080C2000E)
• ATM encapsulation type supported for bridged interworking is aal5snap. However, ATM
encapsulation types supported for routed interworking are aal5snap and mux.
• The existing QoS functionality for ATM is supported, including setting the ATM CLP bit.
• Only ATM AAL5 virtual circuit (VC) mode is supported. ATM VP and port mode are not supported.
• The non-AAL5 traffic is punted, for example, OAM cells. The end-to-end F5 loopback cells are
looped back onto the PE router.
• If the Ethernet frame arriving from Ethernet CE includes a 802.1Q header (VLAN header), due to
the type of endpoint attachment (Ethernet port mode), the VLAN header stays in the frame and it is
forwarded to the ATM CE, as shown in
Figure 21-1.