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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 10 Configuring Ethernet OAM
LCK Expiry Threshold: 3.5
Level to transmit LCK: Default
Defect Condition: No Defect
presentRDI: FALSE
AIS-Status: Enabled
AIS Period: 60000(ms)
AIS Expiry Threshold: 3.5
Level to transmit AIS: Default
Suppress Alarm configuration: Enabled
Suppressing Alarms: No
MIP Settings:
-------------
Local MIPs:
* = MIP Manually Configured
------------------------------------------------------------------------------
Level Port MacAddress SrvcInst Type Id
------------------------------------------------------------------------------
*5 Gi0/3 0021.d7ef.0700 N/A Vlan 2,7
This is an example of output from the show ethernet cfm traceroute command:
Router# show ethernet cfm traceroute
Current Cache-size: 0 Hops
Max Cache-size: 100 Hops
Hold-time: 100 Minutes
Use the commands in Table 10-3 in the privileged EXEC mode to display IP SLA ethernet CFM
information.
Understanding the Ethernet OAM Protocol
The Ethernet OAM protocol for installing, monitoring, and troubleshooting Metro Ethernet networks
and Ethernet WANs relies on an optional sublayer in the data link layer of the OSI model. Normal link
operation does not require Ethernet OAM. You can implement Ethernet OAM on any full-duplex
point-to-point or emulated point-to-point Ethernet link for a network or part of a network (specified
interfaces).
OAM frames, called OAM protocol data units (OAM PDUs) use the slow protocol destination MAC
address 0180.c200.0002. They are intercepted by the MAC sublayer and cannot propagate beyond a
single hop within an Ethernet network. Ethernet OAM is a relatively slow protocol, with a maximum
transmission rate of 10 frames per second, resulting in minor impact to normal operations. However,
when you enable link monitoring, because the CPU must poll error counters frequently, the number of
required CPU cycles is proportional to the number of interfaces that must be polled.
Table 10-3 Displaying IP SLA CFM Information
Command Purpose
show ip sla configuration [entry-number] Displays configuration values including all defaults for all IP SLA
operations or a specific operation.
show ip sla ethernet-monitor configuration
[entry-number]
Displays the configuration of the IP SLA automatic ethernet operation.
show ip sla statistics [entry-number |
aggregated | details]
Display current or aggregated operational status and statistics.