loopback remote swap-mac
Function
The loopback remote swap-mac command enables remote MAC swap loopback.
The undo loopback remote swap-mac command disables remote MAC swap loopback.
By default, remote MAC swap loopback is disabled on an interface.
Format
Models excluding the S5735-L, S5735S-L, S5735S-L-M, S5735-S, S5735-S-I, and S5735S-S:
loopback remote swap-mac source-mac source-mac-address dest-mac dest-mac-address vlan vlan-id [ inner-vlan inner-vlan-id ] [ timeout { time-value | none } ]
undo loopback remote swap-mac
S5735-L, S5735S-L, S5735S-L-M, S5735-S, S5735-S-I, and S5735S-S:
loopback remote swap-mac [ timeout { time-value | none } ]
undo loopback remote swap-mac
Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support the inner-vlan inner-vlan-id parameter.
Parameters
Parameter |
Description |
Value |
|---|---|---|
source-mac source-mac-address |
Specifies the source MAC address of test packets. |
The value is in H-H-H format. An H is a hexadecimal number of 1 to 4 digits. The source and destination MAC addresses must be unicast MAC addresses. |
dest-mac dest-mac-address |
Specifies the destination MAC address of test packets. |
The value is in H-H-H format. An H is a hexadecimal number of 1 to 4 digits. The source and destination MAC addresses must be unicast MAC addresses. |
vlan vlan-id |
Specifies the VLAN ID of test packets. |
The value is an integer that ranges from 1 to 4094. |
inner-vlan inner-vlan-id |
Specifies the inner VLAN ID of test packets. |
The value is an integer that ranges from 1 to 4094. |
timeout time-value |
Specifies the timeout period of a loopback test. If the loopback swap-mac start command is run to enable MAC swap loopback, a MAC swap loopback test stops after the timeout period of the loopback test expires. |
The value is an integer that ranges from 5 to 300, in seconds. The default value is 60. |
timeout none |
Indicates that the loopback test timeout function is disabled. If the loopback swap-mac start command is run to enable MAC swap loopback, a MAC swap loopback test cannot automatically stop after its timeout period expires. Instead, you must run the loopback swap-mac stop command to manually stop the MAC swap loopback test. |
- |
Views
Ethernet interface view, GE interface view, XGE interface view, 25GE interface view, 40GE interface view, 100GE interface view, MultiGE interface view, Eth-Trunk interface view
Usage Guidelines
Usage Scenario
Before using the Switch to provide services for users, perform a remote MAC swap loopback test to check whether the Switch can provide services properly. This test checks connectivity and performance of the network between the Switch uplink interface and a remote device. The remote MAC swap loopback test can also check whether VLAN mapping and VLAN stacking are configured successfully on the uplink interface.
A remote MAC swap loopback test checks connectivity and performance of the network between a tester and a tested switch but does not check performance of the tested switch.
In a remote MAC swap loopback test, a tester sends test packets to the Switch. When test packets reach the uplink interface, the Switch swaps the source and destination MAC addresses of test packets and sends the packets back to the tester through this interface.
Follow-up Procedure
Run the loopback swap-mac start command to enable the MAC swap loopback function.
Precautions
An Eth-Trunk interface supports the MAC swap loopback function but an Eth-Trunk member interface does not.
The port is not a Layer 3 port. If the port is a Layer 3 port, run the portswitch command to switch the port to the Layer 2 mode.
- The loopback remote swap-mac and single-fiber enable commands cannot be used on the same interface.
- If the switch does not receive any test packet within the timeout period after the remote MAC swap loopback test starts, perform the test again. And then run the loopback swap-mac start command.
- If timeout none is specified in the command, you can perform a loopback test at any time until the MAC swap loopback function is disabled by using the loopback swap-mac stop command.