Using GMAC Ping to Monitor Link Connectivity on a Layer 2 Network

Generic MAC (GMAC) ping applies to a part of or a whole network for monitoring connectivity without configuring a maintenance domain (MD), maintenance association (MA), or maintenance association end point (MEP).

Context

GMAC ping has principles similar to those of 802.1ag MAC ping. The difference is that a source device does not need to be a MEP, and a destination device does not need to be a MEP or maintenance association intermediate point (MIP). In other words, GMAC ping can be implemented without the need to configure an MD, MA, or MEP on the source, intermediate, or destination device.

Enable the GMAC ping function on the source and destination devices. The intermediate devices must have the bridge function to directly forward messages.

Procedure

Run system-view
The system view is displayed.
Run ping mac enable
The GMAC ping function is enabled globally.

If the GMAC ping function is enabled:
- A source device starts the GMAC ping function by sending a loopback message (LBM) to a destination device.
- After receiving the LBM, the destination device replies to the source device with a loopback reply (LBR).
Run commit
The configuration is committed.

(Optional) In a VLAN scenario: Run ping mac mac-address vlan vlan-id [ interface interface-type interface-number | -c count | -s packetsize | -t timeout -p priority-value ] ^*

The VLAN network connectivity is checked.

The following shows an example:

<HUAWEI> system-view 
[~HUAWEI] ping mac enable 
[*HUAWEI] commit 
[~HUAWEI] ping mac 00e0-fc12-3456 vlan 10 -c 2 -s 112 
Reply from 00e0-fc12-3456: bytes = 112 time < 1ms 
Reply from 00e0-fc12-3456: bytes = 112 time < 1ms 
Packets: Sent = 2, Received = 2, loss = 0 (0.00% loss) 
Minimum = 1ms, Maximum = 1ms, Average = 1ms

(Optional) In a VLL scenario: Run ping mac mac-address l2vc l2vc-id { raw | tagged } [ interface interface-type interface-number | { pe-vid pe-vid ce-vid ce-vid | dot1q-vlan vlan-id } -c count | -s packetsize | -t timeout | -p priority-value ] ^*

The VLL network connectivity is checked.

The following shows an example:

<HUAWEI> system-view
[~HUAWEI] ping mac enable
[*HUAWEI] commit
[~HUAWEI] ping mac 00e0-fc12-3456 l2vc 1 raw -c 2 -s 112
Reply from 00e0-fc12-3456: bytes = 112 time < 1ms
Reply from 00e0-fc12-3456: bytes = 112 time < 1ms
Packets: Sent = 2, Received = 2, loss = 0 (0.00% loss)
Minimum = 1ms, Maximum = 1ms, Average = 1ms

(Optional) In a VPLS scenario: Run ping mac mac-address vsi vsi-name [ interface interface-type interface-number | { pe-vid pe-vid ce-vid ce-vid | dot1q-vlan vlan-id } -c count | -s packetsize | -t timeout | -p priority-value ] ^*

The VPLS network connectivity is checked.

The following shows an example:

<HUAWEI> system-view
[~HUAWEI] ping mac enable
[*HUAWEI] commit
[~HUAWEI] ping mac 00e0-fc12-3456 vsi vsi1 -c 2 -s 112
Reply from 00e0-fc12-3456: bytes = 112 time < 1ms
Reply from 00e0-fc12-3456: bytes = 112 time < 1ms
Packets: Sent = 2, Received = 2, loss = 0 (0.00% loss)
Minimum = 1ms, Maximum = 1ms, Average = 1ms