Cisco Systems A9014CFD manual Understanding Ethernet Loopback, Displaying E-LMI Information, 10-51

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.

Table 10-5	Displaying E-LMI Information
Command		Purpose
show ethernet lmi evc [detail evc-id[interface		Displays details sent to the CE from the status request poll about the
interface-id] map interface type number]		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		Displays information relevant to the specified Ethernet service
efp-identifier interface interface-id interface		instances (EFPs).
interface-id}

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

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09		10-51