ATM OAM Ping - Cisco
ATM OAM Ping
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ATM OAM Ping
First Published: 12.0(21)S
Last Updated: February 28, 2006
The ATM OAM Ping feature sends an ATM Operation, Administration, and Maintenance (OAM) packet to confirm the connectivity of a specific permanent virtual circuit (PVC). The status of the PVC is displayed when a response to the OAM packet is received. The ATM OAM Ping feature allows the network administrator to verify PVC integrity and facilitates ATM network troubleshooting.
History for the ATM OAM Ping Feature
This feature was introduced.
This feature was integrated into Cisco IOS Release 12.2(13)T.
This feature was integrated into Cisco IOS Release 12.2(25)S.
12.2(18)SXE
This feature was integrated into Cisco&IOS Release 12.2(18)SXE.
12.2(28)SB
This feature was integrated into Cisco&IOS Release 12.2(28)SB.
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A PVC corresponding to the virtual path identifier (VPI) and virtual channel identifier (VCI) values entered with the ping command should already exist. (For Cisco 827 series routers, the virtual circuit need not exist.)
& in the , Release 12.3.
The ATM OAM Ping feature does not support pings based on the following:
oNetwork service access point (NSAP) addresses
oMultiple-hop loopbacks
oLoopback location identification
To use the ATM OAM Ping, you must understand the following concept:
The ATM OAM Ping feature modifies the ping command, which can be used to send an OAM packet to verify the PVC connectivity. The status of the PVC is displayed when a response to the OAM packet is received. This is a common method for testing the accessibility of the devices.
The ping atm interface atm command provides two ATM OAM ping options:
oEnd loopback--Verifies end-to-end PVC integrity.
oSegment loopback--Verifies PVC integrity to the immediate neighboring ATM device.
The ping atm interface atm command is used to determine the following:
oWhether a remote host is active or inactive.
oThe round-trip delay in communicating with the host.
oPacket loss.
The simpler ping command provides an interactive mode for testing ATM network connectivity. The ping command first sends an OAM command loopback cell to the destination and then waits for an OAM response loopback cell. The ping is successful only when the following criteria are met:
oThe OAM command loopback cell reaches the destination.
oThe destination is able to send an OAM loopback response cell back to the source within a predetermined time called a timeout. The default value of the timeout is 2 seconds on Cisco routers.
See the following sections for tasks that use ping commands to test network connectivity in an ATM network. The tasks in this list are optional.
The task in this section tests network connectivity using the ping atm interface atm co that is, by entering all values for the ping test on the command line.
2. ping atm interface atm interface-number vpi-value vci-value [end-loopback [repeat [timeout]] | seg-loopback [repeat [timeout]]]
Router& enable
Enables privileged EXEC mode.
oEnter your password if prompted.
ping atm interface atm interface-number vpi-value vci-value [end-loopback [repeat [timeout]] | seg-loopback [repeat [timeout]]]
Router# ping atm interface atm 1/1.1 0 500 end-loopback 1 2
Displays a response to confirm the connectivity of a specific PVC.
oatm interface-number--ATM interface name.
ovpi-value--Virtual path identifier. Range: 0 to 255.
ovci-value--Virtual channel identifier. Range: 0 to 65535.
oend-loopback--Sends ATM end loopback cells. This is the default.
oseg-loopback--Sends ATM segment loopback cells.
orepeat--Number of ping packets that are sent to the destination. Range: 1 to 1000. Default: 5.
otimeout--Timeout interval, in seconds. Range: 1 to 30. Default: 2.
The task in this section tests network connectivity using the ping command by providing inputs in
that is, by providing values for the ping test by typing the value after the prompts displayed and pressing the Enter key. Press the Enter key without supplying a value to use the default.
Router& enable
Enables privileged EXEC mode.
oEnter your password if prompted.
Router# ping
Displays a response to confirm the connectivity of a specific PVC.
To terminate a ping session, type the escape sequence--by default, Ctrl-Shift-6.
This section provides the following configuration examples:
The following example helps verify the connectivity of a specific PVC by sending an ATM OAM packet and confirms the connectivity when it is successful:
Router# show atm pvc 0/500
VC 0/500 doesn't exist on interface ATM1/0 - cannot display
ATM1/1.1: VCD: 2, VPI: 0, VCI: 500
UBR, PeakRate: N/A (UBR VC)
AAL5-LLC/SNAP, etype:0x0, Flags: 0xC20, VCmode: 0x0
OAM frequency: 10 second(s), OAM retry frequency: 1 second(s)
OAM up retry count: 3, OAM down retry count: 5
OAM END CC Activate retry count: 3, OAM END CC Deactivate retry count: 3
OAM END CC retry frequency: 30 second(s),
OAM SEGMENT CC Activate retry count: 3, OAM SEGMENT CC Deactivate retry count: 3
OAM SEGMENT CC retry frequency: 30 second(s),
OAM Loopback status: OAM Received
OAM VC state: Verified
ILMI VC state: Not Managed
OAM END CC status: OAM CC Ready
OAM END CC VC state: Verified
OAM SEGMENT CC status: OAM CC Ready
OAM SEGMENT CC VC state: Verified
VC is managed by OAM.
InARP frequency: 15 minutes(s)
InPkts: 289035, OutPkts: 217088, InBytes: , OutBytes:
InPRoc: 289039, OutPRoc: 289274
InFast: 0, OutFast: 0, InAS: 1, OutAS: 2
Out CLP=1 Pkts: 0
OAM cells received: 119900
F5 InEndloop: 119809, F5 InSegloop: 0,
F5 InEndcc: 0, F5 InSegcc: 0, F5 InAIS: 92, F5 InRDI: 0
OAM cells sent: 119902
F5 OutEndloop: 119810, F5 OutSegloop: 0,
F5 OutEndcc: 0, F5 OutSegcc: 0, F5 OutAIS: 0, F5 OutRDI: 92
OAM cell drops: 0
Status: UP
The following example shows sample output for the ping atm interface atm command in normal mode:
Router# ping atm interface atm1/1.1 0 500
Type escape sequence to abort.
Sending 5, 53-byte end-to-end OAM echoes, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/16/52 ms
Router# ping atm interface atm1/1.1 0 500 seg-loopback
Type escape sequence to abort.
Sending 5, 53-byte segment OAM echoes, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
Router# ping atm interface atm1/1.1 0 500 end-loopback 100 25
Type escape sequence to abort.
Sending 100, 53-byte end-to-end OAM echoes, timeout is 25 seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (100/100), round-trip min/avg/max = 4/13/180 ms
Router# ping atm interface atm1/1.1 0 500 seg-loopback 50 20
Type escape sequence to abort.
Sending 50, 53-byte segment OAM echoes, timeout is 20 seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (50/50), round-trip min/avg/max = 1/1/4 ms
Router# show atm pvc 0/500
VC 0/500 doesn't exist on interface ATM1/0 - cannot display
ATM1/1.1: VCD: 2, VPI: 0, VCI: 500
UBR, PeakRate: N/A (UBR VC)
AAL5-LLC/SNAP, etype:0x0, Flags: 0xC20, VCmode: 0x0
OAM frequency: 10 second(s), OAM retry frequency: 1 second(s)
OAM up retry count: 3, OAM down retry count: 5
OAM END CC Activate retry count: 3, OAM END CC Deactivate retry count: 3
OAM END CC retry frequency: 30 second(s),
OAM SEGMENT CC Activate retry count: 3, OAM SEGMENT CC Deactivate retry count: 3
OAM SEGMENT CC retry frequency: 30 second(s),
OAM Loopback status: OAM Received
OAM VC state: Verified
ILMI VC state: Not Managed
OAM END CC status: OAM CC Ready
OAM END CC VC state: Verified
OAM SEGMENT CC status: OAM CC Ready
OAM SEGMENT CC VC state: Verified
VC is managed by OAM.
InARP frequency: 15 minutes(s)
InPkts: 290975, OutPkts: 219031, InBytes: , OutBytes:
InPRoc: 290979, OutPRoc: 291219
InFast: 0, OutFast: 0, InAS: 1, OutAS: 2
Out CLP=1 Pkts: 0
OAM cells received: 120881
F5 InEndloop: 120734, F5 InSegloop: 55,
F5 InEndcc: 0, F5 InSegcc: 0, F5 InAIS: 92, F5 InRDI: 0
OAM cells sent: 120882
F5 OutEndloop: 120735, F5 OutSegloop: 55,
F5 OutEndcc: 0, F5 OutSegcc: 0, F5 OutAIS: 0, F5 OutRDI: 92
OAM cell drops: 0
Status: UP
The following is sample output for the ping command in the interactive mode:
Router# ping
Protocol [ip]: atm
ATM Interface: atm1/1.1
VPI value [0]: 0
VCI value [1]: 500
Loopback - End(0), Segment(1) [0]:
Repeat Count [5]:
Timeout [2]:
Type escape sequence to abort.
Sending 5, 53-byte end-to-end OAM echoes, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/9/12 ms
The following sections provide references related to the ATM OAM Ping.
Configuring PVCs and mapping a protocol address to a PVC while configuring ATM
&Creating PVCs& chapter in the , Release 12.3
Configuring ATM
&Configuring ATM& chapter in the , Release 12.3
WAN commands, complete command syntax, command mode, command history, defaults, usage guidelines, and examples
, Release&12.3
Configuring ATM OAM traffic reduction
feature module
Configuring PVCs with or without OAM
sample configuration
Detecting failures when using OAM cells and PVC management
technical note
ITU-T Specification I.610 (ITU-T specification for B-ISDN operation and maintenance principles and functions).
I.610 Series I: Integrated Services Digital Network, Maintenance principles
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This section documents a modified command only.
ping atm interface atm
To perform an ATM Operation Administration Maintenance (OAM) ping on a specific permanent virtual circuit (PVC), use the ping atm interface atm command in privileged EXEC mode.
ping atm interface atm interface-number vpi-value vci-value [end-loopback [repeat [timeout]] | seg-loopback [repeat [timeout]]]
Syntax Description
atm interface_number
ATM interface name.
Virtual path identifier. Range: 0 to 255.
Virtual channel identifier. Range: 0 to 65535.
end-loopback
(Optional) Send ATM end loopback cells. This is the default.
seg-loopback
(Optional) Send ATM segment loopback cells.
(Optional) Number of ping packets that are sent to the destination address. Range: 1 to 1000. Default: 5.
(Optional) Timeout interval, in seconds. Range: 1 to 30. Default: 2.
Command Default
End loopbackRepeats: 5Timeout interval: 2 seconds
Command Modes
Privileged EXEC
Command History
This command was introduced on the LightStream 1010.
Support for this command was integrated into Cisco IOS Release 12.0(21)S.
Support for this command was integrated into Cisco IOS Release 12.2(13)T.
Support for this command was integrated into Cisco IOS Release 12.2(25)S.
12.2(18)SXE
This command was integrated into Cisco&IOS Release 12.2(18)SXE.
12.2(28)SB
This command was integrated into Cisco&IOS Release 12.2(28)SB.
Usage Guidelines
The ping atm interface atm command sends an OAM packet and indicates when a response is received. It can be used either in normal mode or in interactive mode. The ping atm interface atm command provides two ATM OAM ping options:
oEnd loopback--Verifies end-to-end PVC integrity.
oSegment loopback--Verifies PVC integrity to the neighboring ATM device.
In the following example, an ATM OAM ping with a 15-second timeout verifies end-to-end connectivity for PVC 0/500 in the normal mode:
Router# ping atm interface atm 1/1.1 0 500 end-loopback 30 15
Type escape sequence to abort.
Sending 30, 53-byte end-to-end OAM echoes, timeout is 15 seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (30/30), round-trip min/avg/max = 1/1/4 ms
In the following example, an ATM OAM ping verifies connectivity to the first-hop ATM switch on PVC 1/100 in the normal mode:
Router# ping atm interface atm 1/1.1 0 500 seg-loopback 30 10
Type escape sequence to abort.
Sending 30, 53-byte segment OAM echoes, timeout is 10 seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (30/30), round-trip min/avg/max = 1/1/4 ms
describes the significant fields shown in the display.
Table&1 ping atm Field Descriptions
Success rate is 100 percent
Percentage of packets successfully echoed back to the router. Anything less than 80 percent is usually considered problematic.
Each exclamation point (!) indicates receipt of a reply. A period (.) indicates that an OAM response cell was not received within the timeout interval.
round-trip min/avg/max = 1/1/4 ms
Round-trip travel time intervals for the OAM loopback cells, including minimum/average/maximum (in milliseconds).
The following example verifies connectivity to the neighboring ATM device for the ATM PVC with the virtual path identifier (VPI)/virtual channel identifier (VCI) value 0/500 in the interactive mode:
Router# ping
Protocol [ip]:atm
ATM Interface:atm1/1.1
VPI value [0]:0
VCI value [1]:500
Loopback - End(0), Segment(1) [0]:1
Repeat Count [5]:
Timeout [2]:
Type escape sequence to abort.
Sending 5, 53-byte segment OAM echoes, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
describes the ping fields shown in the display.
Table&2 ping Field Descriptions for ATM&
Protocol [ip]:
Prompt for a supported protocol.
ATM Interface:
Prompt for the ATM interface.
VPI value [0]:
Prompt for the virtual path identifier. Default: 0.
VCI value [1]:
Prompt for the virtual channel identifier. Default: 1.
Loopback - End(0), Segment(1) [0]:
Prompt to specify end loopback, which verifies end-to-end PVC integrity, or segment loopback, which verifies PVC integrity to the neighboring ATM device. Default: end loopback.
Repeat Count [5]:
Number of ping packets that will be sent to the destination. Default: 5.
Timeout [2]:
Timeout interval, in seconds. Default: 2.
Related Commands
debug atm oam
Displays information about ATM OAM events.
show atm pvc
Displays the OAM status information.
show atm oam auto-detect
Displays ATM OAM autodetect statistics.
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