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Cisco 10000 Series Router Software Configuration Guide
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Chapter 21 Configuring L2VPN Interworking
Ethernet/VLAN to Frame Relay Interworking
Ethernet/VLAN to Frame Relay Interworking
The Ethernet VLAN to Frame Relay (FR) Interworking feature is described in the following topics:
• Prerequisites of Ethernet/VLAN to Frame Relay Interworking, page 21-17
• Restrictions for Ethernet/VLAN to Frame Relay Interworking, page 21-17
• FR DLCI to Ethernet Local Switching—Bridged Interworking, page 21-19
• FR DLCI to VLAN 802.1Q Local Switching—Bridged Interworking, page 21-20
• FR DLCI to Ethernet Port AToM—Bridged Interworking, page 21-20
• FR DLCI to Ethernet VLAN 802.1Q AToM—Bridged Interworking, page 21-21
• Frame Relay to Ethernet—Routed Interworking, page 21-22
• Configuration Tasks and Examples, page 21-23
Prerequisites of Ethernet/VLAN to Frame Relay Interworking
Before you configure Ethernet/VLAN to Frame Relay Interworking on a network, you must enable Cisco
Express Forwarding.
Restrictions for Ethernet/VLAN to Frame Relay Interworking
In Cisco IOS Release 12.2(33)SB, the Ethernet/VLAN to Frame Relay LS has the following restrictions:
• The following translations are only supported and other translations are dropped:
–
Ethernet without LAN FCS (0300800080C20007 or 6558)
–
Spanning tree (0300800080C2000E or 4242)
• The PVC status signaling works the same way as in the like-to-like case. The PE router reports the
PVC status to the CE router based on the availability of the other CE router.
• Only FR DLCI mode is supported. FR port mode is not supported.
• If the Ethernet frame 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
FR
CE (Figure 21-10).