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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 10 Configuring Ethernet OAM
Understanding Ethernet Loopback
Use the show ethernet lmi commands to display information that was sent to the CE from the status
request poll. Use the show ethernet service commands to show current status on the device.
Displaying E-LMI Information
Use the following commands in privileged EXEC mode to display E-LMI information.
Understanding Ethernet Loopback
The local aggregated Ethernet, Fast Ethernet, Tri-Rate Ethernet copper, and Gigabit Ethernet interfaces
connect to a remote system. The Loopback command is used to place the interface in loopback mode.
You can use per-port and per EFP Ethernet loopback to test connectivity at initial startup, to test
throughput, and to test quality of service in both directions. The RFC2544 for latency testing specifies
that the throughput must be measured by sending frames at increasing rate, representing the percentage
of frames received as graphs, and reporting the frames dropping rate. This rate is dependent on the frame
size. This throughput measurement at traffic generator requires the ethernet loopback support on the
responder.
Ethernet loopback can be achieved with External or Internal loopback. External loopback is the process
of looping frames coming from the port on the wire side. Internal loopback is the process of looping
frames coming from the port on the relay side.
Configuring Ethernet Loopback
This section contains the following topics:
• Restrictions
• Enabling Ethernet Loopback
• Configuration Example
Table 10-5 Displaying E-LMI Information
Command Purpose
show ethernet lmi evc [detail evc-id [interface
interface-id] | map interface type number]
Displays details sent to the CE from the status request poll about the
E-LMI EVC.
show ethernet lmi parameters interface interface-id Displays Ethernet LMI interface parameters sent to the CE from the
status request poll.
show ethernet lmi statistics interface interface-id Displays Ethernet LMI interface statistics sent to the CE from the
status request poll.
show ethernet lmi uni map interface [interface-id] Displays information about the E-LMI UNI VLAN map sent to the CE
from the status request poll.
show ethernet service instance {detail | id
efp-identifier interface interface-id | interface
interface-id}
Displays information relevant to the specified Ethernet service
instances (EFPs).