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The Operation, Administration, and Maintenance (OAM) feature performs the following functions:
OAM is supported on point-to-point subinterfaces with a single permanent virtual circuit (PVC) on the PA-A3 ATM interface.
After the feature is enabled, the F5 OAM AIS with the failure equal to AIS(0x6A) is monitored on the PVC. If the number of consecutive OAM AIS cells received is greater than the configured number, the subinterface is brought down. The subinterface is up when no OAM AIS cell is received during a configured interval.
If the PVC has end-to-end OAM loopback enabled, the subinterface is brought down after a configured number of retries. After the OAM loopback succeeds or the far-end router sends a loopback request, the subinterface is brought up.
Command descriptions use these conventions:
This feature is supported on these platforms:
To configure the OAM feature, perform the following tasks beginning in global configuration mode:
| Task | Command | ||
|---|---|---|---|
| interface atm number | ||
| atm oam-man ais-down [number] | ||
| atm oam-man ais-up [number] | ||
| atm oam-man retries [number] | ||
| show atm interface | ||
| show atm vc | ||
| end |
For ATM configuration information and examples, refer to the ATM chapters in the Wide-Area Networking Configuration Guide.
The following example enables the OAM AIS feature. The following is an example on ATM interface 1 in slot 0.
router# configure terminal router(config)# interface a1/0 router(config-if)#atm oam router(config-if)#atm oam-man ais-down 5 ais-up 6 retries 20 router(config-if)#end
This section documents new or modified commands. All other commands used with this feature are documented in the Cisco IOS Release 11.1 command references.
Use the atm oam-man command to specify the number of consecutive OAM AIS cells received before the subinterface is brought down and brought up. This command is also used to specify how many times an OAM loopback is attempted before the subinterface stops functioning. The no form of this command halts OAM AIS function from the configuration.
atm oam-man [ais-down [number] | ais-up [seconds] | retries [number]]ais-down number | Number of consecutive OAM AIS cells received. The range is 3 to 60. The default is 3 OAM AIS cells. |
ais-up seconds | Number of seconds with no OAM AIS cells received. The range is 3 to 60 seconds. The default is 3 seconds. |
retries number | The number of retries range is 1 to 60. The default is 3 retries. |
Interface configuration
This command first appeared in Cisco IOS Release 11.1CC.
The following example shows five consecutive OAM cells received before the sub-interface is brought down, and 6 seconds with no OAM AIS cells received must elapse before the configuration is brought back up. In addition, 60 OAM loopback attempts occur before the interface is brought down.
router(config-if)#atm oam-man ais-down 5 ais-up 6 retries 60
Use the show atm interface command to specify how many times an OAM loopback is attempted before the subinterface stops functioning.
show atm interface slot/port (Cisco 7200 series with ATM port adapter; Cisco 7500 series with AIP)slot/port | ATM slot number and port number on the following:
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slot/port-adapter/port | ATM slot, port adapter, and port number on the Cisco 7500 series with ATM port adapter |
Privileged EXEC
This command first appeared in Cisco IOS Release 11.1.
The following is sample output from the show atm interface command on a Cisco 7500 series router:
Router# show atm interface a1/0
ATM interface ATM1/0: AAL enabled: AAL5 , Maximum VCs: 4096, Current VCCs: 3 Maximum Datagram Size:4528 MIDs/VC: 1024 OAM AIS Down:3, Up:3, Max loopback retries:3 PLIM Type:E3 - 34Mbps, Framing is G.832/G.804, TX clocking: LINE
Scrambling:ON, 566018 input, 568653 output, 0 IN fast, 0 OUT fast, ATM1/0.60: AAL3/4-SMDS address c148.1234.1111 Multicast e180.9999.9999 Config. is ACTIVE
| Field | Description |
|---|---|
ATM interface ATM1/0 | Slot and port number of the interface. |
AAL enabled | Type of AAL. If both AAL5 and AAL3/4 are enabled on the interface, the output includes both AAL5 and AAL3/4. |
Maximum VCs | Maximum number of virtual circuits this interface can support. |
Current VCCs | Number of active virtual circuits. |
Maximum Datagram Size | Size of datagram. |
MIDs/VC | Maximum configured number of message identifiers allowed per virtual circuit on this interface. |
OAM AIS Down | Number of consecutive OAM AIS cells received. |
Up | Number of seconds with no OAM AIS cells received. |
Max loopback retries | Number of loopback retries, ranging from 1 to 60. |
PLIM Type | Type of physical layer interface module. |
Framing is | No framing. |
TX clocking | Clocking on the router. LINE indicates that the ATM switch provides the clocking. |
Scrambling | Indication that scrambling is on or off. |
input | Number of packets received and process-switched. |
output | Number of packets sent from process switch. |
IN fast | Number of input packets fast-switched. |
OUT fast | Number of output packets fast-switched. |
ATM 1/0.60: | Indication that the subinterface supports ATM adaptation layer AAL 3/4 and displays the SMDS E.164 unicast address and the SMDS E.164 multicast address assigned to the subinterface. |
Config. is | ACTIVE or VALID in n SECONDS. ACTIVE indicates that the current AIP or NPM configuration has been loaded into the AIP and is being used. There is a 5-second window when a user changes a configuration and the configuration is sent to the AIP. |
Show atm vc
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