Cisco IOS Wide-Area Networking Configuration Guide - Free Books

ATM AAL5 SDU over L2TPv3 and Single Cell Relay VC Mode over L2TPv3Restrictions• The ATM AAL5 OAM Emulation over L2TPv3 feature and the ATM Single Cell Relay VC Modeover L2TPv3 feature are supported only on the Cisco 7200, Cisco 7301, Cisco 7304 NSE-100,Cisco 7304 NPE-G100, and Cisco 7500 series routers with ATM Deluxe PA-A3 interfaces.• Sequencing is supported only for ATM adaptation layer 5 (AAL5) service data unit (SDU) framesor ATM cell relay packets. Sequencing of Operation, Administration, and Maintenance (OAM) cellsis not supported.• Sequencing is supported in CEF mode. If sequencing is enabled with dCEF, all L2TP packets thatrequire sequence number processing are sent to the RSP module.• L2TPv3 manual mode configuration does not support ATM alarm signaling over the pseudowire.• The Cisco 7200 series and the Cisco 7500 series ATM driver cannot forward Resource Management(RM) OAM cells over the packet-switched network (PSN) for available bit rate (ABR) ToS. TheRM cells are locally terminated.ATM Port Mode Cell Relay over L2TPv3 Restrictions• Port mode and virtual path (VP) or VC mode cell relay are mutually exclusive. After theATM interface is configured for cell relay, no permanent virtual path (PVP) or PVC commands areallowed on that interface.• ATM port mode cell relay is supported only on the PA-A3-T3, PA-A3-E3, and PA-A3-OC-3 ATMport adapters.• ATM port mode cell relay is not supported on the PA-A3-8T1IMA and PA-A3-8E1IMA portadapters.ATM Cell Packing over L2TPv3 Restrictions• The ATM Cell Packing over L2TPv3 feature is supported only on PA-A3 ATM interfaces onCisco 7200 and Cisco 7500 routers. Cell packing cannot be configured on other platforms orinterface cards.• A minimum of 2 and a maximum of 28 ATM cells can be packed into an L2TPv3 data packet.Protocol Demultiplexing for L2TPv3 Restrictions• IPv6 protocol demultiplexing is supported for Ethernet and terminated DLCI Frame Relayinterfaces, PPP traffic, and HDLC traffic.• Frame Relay demultiplexing is supported for point-to-point or multipoint.• FRF.12 end-to-end fragmentation is supported on the Cisco 7500 and Cisco 12000 series routersonly between the CE and the PE routers.• FRF.9 hardware payload compression is supported on the Cisco 7200 series and Cisco 7500 seriesrouters only between the CE and the PE routers.• FRF.9 software payload compression is supported on the Cisco 7500 series routers only between theCE and the PE routers.24