Cisco 10000-2P2-2DC Software Guide - Page 413
Configuring OAM Cell Emulation for ATM AAL5 SDU Support over MPLS
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Chapter 20 Configuring L2 Virtual Private Networks Configuration Tasks for L2VPN • 1-port OC-12 To configure ATM-to-ATM PVC local switching, enter the following commands, beginning in global configuration mode: Step 1 Step 2 Step 3 Step 4 Command Router(config)# interface atm slot/port Router(config-if)# pvc vpi/vci l2transport Router(cfg-if-atm-l2trans-pvc)# encapsulation layer-type Router(config)# connect connection-name interface pvc interface pvc Purpose Specifies an ATM interface and enters interface configuration mode. Assigns a virtual path identifier (VPI) and virtual channel identifier (VCI). The l2transport keyword indicates that the permanent virtual circuit (PVC) is a switched PVC instead of a terminated PVC. Specifies the encapsulation type for the PVCs, AAL5 is the only layer type supported. Repeat Steps 1, 2, and 3 for another ATM PVC on the same router. Creates a local connection between the two specified PVCs. Example 20-5 shows how to enable ATM AAL5 SDU mode Layer 2 local switching. Example 20-5 Enabling ATM AAL5 SDU Mode Layer 2 Local Switching interface atm 1/0/0 pvc 0/100 l2transport encapsulation aal5 interface atm 2/0/0 pvc 0/50 l2transport encapsulation aal5 connect conn1 atm 1/0/0 0/100 atm 2/0/0 0/50 Configuring OAM Cell Emulation for ATM AAL5 SDU Support over MPLS If a PE router does not support the transport of Operation, Administration, and Maintenance (OAM) cells across an LSP, you can use OAM cell emulation to locally terminate or loop back the OAM cells. You configure OAM cell emulation on both PE routers, which emulates a VC by forming two unidirectional LSPs. You use the oam-ac emulation-enable and oam-pvc manage commands on both PE routers to enable OAM cell emulation. After you enable OAM cell emulation on a router, you can configure and manage the ATM VC in the same manner as you would a terminated VC. A VC that is configured with OAM cell emulation can send loopback cells at configured intervals toward the local CE router. The endpoint can be either of the following: • End-to-end loopback, which sends OAM cells to the local CE router. • Segment loopback, which responds to OAM cells to a device along the path between the PE and CE routers. OL-2226-23 Cisco 10000 Series Router Software Configuration Guide 20-15
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