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21-5
Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 21 Configuring L2VPN Interworking
Ethernet/VLAN to ATM AAL5 Interworking
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ATM and FR point-to-point—By default, inverse ARP does not run in the point-to-point FR or
ATM subinterfaces. The IP Address and subnet mask define the connected prefix therefore,
configuration is not required in the CE devices.
• Interworking using pseudowire at L2 requires that the MTUs in both attachment circuits match, for
the pseudowire to come up. The default MTU in one AC requires to be changed, so that it matches
with other AC.
Table 21-1 lists the range of MTUs that can be configured on the Cisco 10000 series
router for different ACs.
Table 21-1 Range Of MTUs For Different ACs
• The CEs with Ethernet attachment VCs running OSPF must be configured with the ospfIfType
option so that the OSPF protocol treats the underlying physical broadcast link as a P2P link.
Restrictions for Routed Interworking
Routed interworking has the following restrictions:
• Maximum numbers of AC supported are 16K.
• Fragmentation is not supported.
• Multipoint FR and ATM interface ACs are not supported.
• Both bridged and routed interworking do not support QinQ interworking.
• QoS classification on IP tos, dscp and other IP header fields is not supported.
• Security ACL, LI and other features based on IP header fields parsing is not supported.
The following routed interworking features are explained in the chapter:
• Ethernet/VLAN to ATM AAL5 Interworking, page 21-5
• Ethernet/VLAN to Frame Relay Interworking, page 21-17
• ATM to Frame Relay—Routed Interworking, page 21-27
• Verifying L2VPN Interworking, page 21-30
Ethernet/VLAN to ATM AAL5 Interworking
The Ethernet/VLAN to ATM AAL5 Interworking feature is described in the following topics:
• Prerequisites of Ethernet/VLAN to ATM AAL5 Interworking, page 21-6
• Restrictions of Ethernet/VLAN to ATM AAL5 Interworking, page 21-6
AC type Range of MTUs supported
ATM 64-17940
Gig 1500-4470
POS 64-9102
FE 64-9192
Frame Relay 64-7673