The ospf p2mp-mask-ignore command prevents 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, no device on a P2MP network checks the network mask.
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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 to prevent the device from checking the network mask in Hello packets. In this manner, the OSPF neighbor relationship can be established.Prerequisites
A non-fully connected Non-Broadcast Multi-Access (NBMA) network has been changed to common P2MP network using the ospf network-type p2mp command.