Cisco 10000-2P2-2DC Software Guide - Page 453
Restrictions for Routed Interworking, Ethernet/VLAN to ATM AAL5 Interworking
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Chapter 21 Configuring L2VPN Interworking Ethernet/VLAN to ATM AAL5 Interworking - 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 AC type ATM Gig POS FE Frame Relay Range of MTUs supported 64-17940 1500-4470 64-9102 64-9192 64-7673 • 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 OL-2226-23 Cisco 10000 Series Router Software Configuration Guide 21-5
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