The ospf p2mp-mask-ignore command disables a device from checking the network mask on a Point-to-Multipoint (P2MP) network.
The undo ospf p2mp-mask-ignore command configures the device to check the network mask on a P2MP network.
By default, devices on a P2MP network do not check the network mask.
Usage Scenario
OSPF checks the network masks carried in Hello packets. If the network mask carried in a received Hello packet is not the same as the network mask of the local device, the Hello packet is discarded.
On a P2MP network, when the mask lengths of devices are different, you can use the ospf p2mp-mask-ignore command on devices to disable them from checking the network mask in Hello packets. In this manner, the OSPF neighbor relationship can be established.
Prerequisites
Because P2MP is not a link layer protocol, each P2MP network is forcibly changed from a network of another type. A common P2MP network is changed from a non-fully connected non-broadcast multiple access (NBMA) network through the ospf network-type p2mp command.
# Disable a device from checking the network mask on a P2MP network.
<HUAWEI> system-view
[HUAWEI] interface vlanif 100
[HUAWEI-Vlanif100] ospf network-type p2mp
[HUAWEI-Vlanif100] ospf p2mp-mask-ignore
# Disable a device from checking the network mask on a P2MP network.
<HUAWEI> system-view [HUAWEI] interface gigabitethernet 0/0/1 [HUAWEI-GigabitEthernet0/0/1] undo portswitch [HUAWEI-GigabitEthernet0/0/1] ospf network-type p2mp [HUAWEI-GigabitEthernet0/0/1] ospf p2mp-mask-ignore