ethernet loopback (VLAN-aware)

Configures the Ethernet loopback functionality on one or a set of ports in a specific VLAN (VLAN-aware mode).
Syntax
ethernet loopbackethernetunit/slot/port[[tounit/slot/port][ethernetunit/slot/port]...]
no ethernet loopbackethernetunit/slot/port[[tounit/slot/port][ethernetunit/slot/port]...]
ethernet loopbacklaglag-id[tolag-id|ethernetunit/slot/port[[tounit/slot/port][ethernetunit/slot/port]...]]
no ethernet loopbacklaglag-id[tolag-id|ethernetunit/slot/port[[tounit/slot/port][ethernetunit/slot/port]...]]
Command Default

Ethernet loopback is not enabled on any port in a VLAN.

Parameters
ethernet
Specifies the Ethernet interface.
to
Configures the range of ports.
unit/slot/port

Specifies the interface details.

laglag-id
Specifies the LAG virtual interface.
Modes

VLAN configuration mode

Usage Guidelines

The Ethernet loopback functionality on a port in the VLAN-aware mode can be configured either as flow-aware or flow-unaware. The ports on which Ethernet loopback is being enabled must be explicitly assigned as a member of the VLAN.

To enable Ethernet loopback on a port in the VLAN-aware mode as flow-aware, the ethernet loopback test-mac command must be executed for the specific port from the interface mode before enabling Ethernet loopback.

A port cannot be configured as VLAN-aware and VLAN-unaware simultaneously, and the flow configuration must be either flow-aware or flow-unaware.

The ethernet loopback command in VLAN-aware mode is not supported on VLAN Group, VLAN Range, or mult-range VLAN (MVLAN) mode.

The ethernet loopback command VLAN-aware mode cannot be configured on a set of VLANs that share a Layer 2 topology (Topology Group).

The no form of the command disables Ethernet loopback from the ports of the specified VLAN.

Examples

The following example configures Ethernet loopback in VLAN-aware mode as flow-aware. 

device(config)# interface ethernet 1/1/1
device(config-if-e1000-1/1/1)# ethernet loopback test-mac 1111.2222.3333 4444.5555.5555
device(config-if-e1000-1/1/1)# exit
device(config)# vlan 100
device(config-vlan-100)# ethernet loopback ethernet 1/1/1 to 1/1/10

The following example configures Ethernet loopback on a port in VLAN-aware mode as flow-unaware. 

device(config)# vlan 100
device(config-vlan-100)# ethernet loopback ethernet 1/1/1

The following example configures Ethernet loopback on a range of ports in VLAN-aware mode as flow-unaware. 

device(config)# vlan 100
device(config-vlan-100)# ethernet loopback ethernet 1/1/1 to 1/1/10

The following example configures Ethernet loopback on two separate ports in VLAN-aware mode as flow-unaware. 

device(config)# vlan 100
device(config-vlan-100)# ethernet loopback ethernet 1/1/1 ethernet 1/2/3
History
Release version Command history
08.0.30 This command was introduced.
08.0.61 This command was modified to add laglag-id options.
Parent topic: Commands D through H