Cisco IE 2000 Especificações descarregar pdf (Página 306)

17-48

System Management Software Configuration Guide for Cisco IE 2000U and Connected Grid Switches

Chapter 17 Configuring Ethernet OAM, CFM, and E-LMI

Enabling Ethernet Loopback

• When you configure VLAN loopback by entering the vlan vlan-list keywords, the VLANs are

tunneled into an internal VLAN that is not forwarded to any ports. The tunnel ends at the egress, so

it is transparent to the user.

• VLAN loopback is not supported on nontrunk interfaces.

• Terminal loopback is not supported on routed interfaces.

• You cannot configure SPAN and loopback on the switch at the same time. If you try to configure

SPAN on any port while loopback is configured, you receive an error message.

• If a port is a Flex Link port or belongs to an EtherChannel, it cannot be put into a loopback state. If

loopback is active, you cannot add a port to a Flex Link or EtherChannel.

• Port loopback shares hardware resources with the VLAN mapping feature. If not enough TCAM

resources are available because of VLAN-mapping configuration, when you attempt to configure

loopback, you receive an error message, and the configuration is not allowed.

Configuring Ethernet Facility Loopback

BEFORE YOU BEGIN

Review the “Enabling Ethernet Loopback” section on page 17-47.

DETAILED STEPS

Command Purpose

Step 1

configure terminal Enter global configuration mode.

Step 2

interface interface-id Define an interface, and enter interface

configuration mode.

Step 3

ethernet loopback facility [vlan vlan-list]

[mac-address {swap | copy}] [timeout

{seconds | none}] supported

Configure Ethernet facility loopback on the

interface. The keywords have these meanings:

• (Optional) Enter vlan vlan-list to configure

VLAN loopback for nondisruptive loopback

testing. Other VLANs on the port continue to

switch traffic.

• (Optional) Enter mac-address swap to

configure the switch to swap the MAC source

and destination addresses for the loopback

action.

• (Optional) Enter mac-address copy to

configure the switch to copy the MAC source

and destination addresses for the loopback

action. This is the default action if the

mac-address option is not configured.

• (Optional) Enter timeout seconds to set a

loopback timeout period. The range is from 5 to

300 seconds. The default is 60 seconds.

• (Optional) Enter timeout none to set the

loopback to not time out.

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