The ignore-mtu-match command enables the device to ignore the MTU matching check and re-encapsulate the sent VPLS packets.
The undo ignore-mtu-match command disables the device from ignoring the MTU matching check and re-encapsulating the sent VPLS packets.
By default, the device does not ignore the MTU matching check or re-encapsulate sent VPLS packets.
Usage Scenario
In the communication in Kompella mode with devices of other vendors, you can use the ignore-mtu-match command to ignore the MTU check for VSIs if the devices of other vendors do not support the check. By default, the PE device checks whether MTUs of the VSIs on both ends are matched. If the MTUs of the VSIs on two ends are different, the VC cannot go Up.
As defined by the latest RFC, the encapsulation type of PW in the Kompella VPLS is 19. Huawei devices support only the Ethernet encapsulation and VLAN encapsulation. In the communication in Kompella mode with devices of other vendors, you can use the ignore-mtu-match command if the devices of other vendors require to receive a VPLS packet with the encapsulation type as 19. After the ignore-mtu-match command is run, the sent VPLS packet adopts encapsulation type 19.
Prerequisites
Precautions
This command is valid only for the VPLS in Kompella mode and does not take effect in the VPLS in Martini mode. In the Martini VPLS, the MTU values of the VSIs on two ends must be the same.
Huawei devices can interwork with devices of other vendors only when the ignore-mtu-match command is used together with the vpls bgp encapsulation command.
# Disable the MTU matching check of a VSI named bgp1 and use encapsulation type 19 for the sent VPLS packet so that a Huawei device is connected to devices of other vendors.
<HUAWEI> system-view [HUAWEI] vsi bgp1 auto [HUAWEI-vsi-bgp1] pwsignal bgp [HUAWEI-vsi-bgp1-bgp] route-distinguisher 100:1 [HUAWEI-vsi-bgp1-bgp] quit [HUAWEI-vsi-bgp1] ignore-mtu-match