Specifications

oam-pvc
MP-381
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
Command Default OAM management and loop detection are disabled.
Command Modes ATM VC class configuration (for a VC class)
ATM VC configuration (for an ATM PVC or loopback mode detection)
Control-VC configuration (for enabling OAM management on an LC-ATM VC)
PVC-in-range configuration (for an individual PVC within a PVC range)
Command History
Usage Guidelines If OAM management is enabled, further control of OAM management is configured by using the oam
re
try command.
ATM VC or VC Classes
If the oam-pvc command is not explicitly configured on an ATM PVC, the PVC inherits the following
default configuration (in order of precedence):
• Configuration from the oam-pvc command in a VC class assigned to the PVC itself.
• Configuration from the oam-pvc command in a VC class assigned to the ATM subinterface of the
PVC.
• Configuration from the oam-pvc command in a VC class assigned to the ATM main interface of the
PVC.
• Global default: End-to-end F5 OAM loopback cell generation and OAM management are disabled,
but if OAM cells are received, they are looped back. The default value for the frequency argument
is 10 seconds.
Loopback Mode Detection
When a PVC traverses an ATM cloud and OAM is enabled, the router sends a loopback cell to the other
end and waits for a response to determine whether the circuit is up. If an intervening router within the
ATM cloud is in loopback mode, however, the router considers the circuit to be up, when in fact the other
end is not reachable.
When enabled, the Loopback Mode Detection Through OAM feature detects when an intervening router
is
in loopback mode, in which case it sets the OAM state to NOT_VERIFIED. This prevents traffic from
being routed on the PVC for as long as any intervening router is detected as being in loopback mode.
Release Modification
11.3 This command was introduced.
12.1(5)T This command was implemented in PVC-in-range configuration mode.
12.3(2)T This command was implemented for LC-ATM VCs.
12.0(30)S This command was integrated into Cisco IOS Release 12.0(30)S, and the
l
oop-detection keyword was added.
12.2(28)SB This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(33)SRA This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX This command is supported in the Cisco IOS Release 12.2SX train. Support
i
n a specific 12.2SX release of this train depends on your feature set,
platform, and platform hardware.