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Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
OL-14127-08
Chapter 7 Configuring the ATM SPAs
Configuration Tasks
PATH TRACE BUFFER : STABLE
BER thresholds: SF = 10e-3 SD = 10e-6
TCA thresholds: B1 = 10e-6 B2 = 10e-6 B3 = 10e-6
Clock source: line
Configuring AToM VP Cell Mode Relay Support
To configure Any Transport over MPLS (AToM) Cell Mode Relay, perform the following procedure
beginning in global configuration mode:
VP Mode Configuration Guidelines
When configuring ATM Cell Relay over MPLS in VP mode, use the following guidelines:
• You do not need to enter the encapsulation aal0 command in VP mode, but only AAL0
encapsulation is supported with MPLS l2transport.
• One ATM interface can accommodate multiple types of ATM connections. VP cell relay and VC cell
relay can coexist on one ATM interface.
• If a VPI is configured for VP cell relay, you cannot configure a PVC using the same VPI.
• VP trunking (mapping multiple VPs to one emulated VC label) is not supported in this release.
Each
VP is mapped to one emulated VC.
• Each VP is associated with one unique emulated VC ID. The AToM emulated VC type is ATM VP
Cell Transport.
• The AToM control word is supported. However, if a peer PE does not support the control word, it is
disabled. This negotiation is done by LDP label binding.
• VP mode (and VC mode) drop idle cells.
VP Mode Configuration Example
The following example transports single ATM cells over a virtual path:
Router(config)# pseudowire-class vp-cell-relay
Command or Action Purpose
Step 1
Router(config)# interface atm
slot/subslot/port.subinterface multipoint
Enters interface configuration mode for the indicated port on the
specified ATM SPA
Step 2
Router(config-if)# no ip address ip-address mask Removes the IP address that is assigned to this interface (if one
has been configured).
Step 3
Router(config-if)# atm pvp vpi l2transport Creates a permanent virtual path (PVP) used to multiplex (or
bundle) one or more virtual circuits (VCs).
Step 4
Router(config-if)# xconnect peer-ip-address
vc-id {encapsulation mpls | pw-class
pw-class-name}
Routes Layer 2 packets over a specified point-to-point VC by
using ATM over multiprotocol label switching (AToM).
Step 5
Router(config-if)# end Exits interface configuration mode and returns to privileged
EXEC mode.
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