The ospf p2mp-mask-ignore command configures the device not to check the network mask on a P2MP network.
The undo ospf p2mp-mask-ignore command configures the device to check the network mask on a Point-to-Multipoint (P2MP) network.
By default, the device on a P2MP network checks the network mask.
Ethernet interface view, Ethernet sub-interface view, Eth-Trunk interface view, Eth-Trunk sub-interface view, Tunnel interface view, Dialer interface view, VLANIF interface view, Virtual-Template interface view, BDIF interface view
Usage Scenario
OSPF checks the network masks carried in Hello packets. If the network mask carried in a received Hello packet is different than the network mask of the local device, the Hello packet is discarded.
On a P2PM network, when the lengths of device masks are different, the check of network masks in Hello packets can be ignored using this command. In this case, the OSPF neighbor relationship is established. If high network security is required, you can run the undoospf p2mp-mask-ignore command to configure the device not to check the network mask on the P2MP network.
Prerequisites
Since P2MP is not a link layer protocol, the P2MP network is forcibly changed from a network of another type. A common P2MP network is changed from a non-fully-connected Non-Broadcast Multi-Access (NBMA) network running the ospf network-type p2mp command.