Point-to-Point Support

You can manually configure the OSPF (Open Shortest Path First) link type for a VLAN. The following table describes the link types.

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OSPF Link Types

Link Type Number of Routers Description



ExtremeXOS automatically determines the OSPF link type based on the interface type. This is the default setting.



Routers must elect a designated router (DR) and a backup designated router (BDR) during synchronization. Ethernet is an example of a broadcast link.


Up to 2

This type synchronizes faster than a broadcast link because routers do not elect a DR or BDR. It does not operate with more than two routers on the same VLAN. The Point-to-Point Protocol (PPP) is an example of a point-to-point link. An OSPF point-to-point link supports only zero to two OSPF routers and does not elect a designated router (DR) or backup designated router (BDR). If you have three or more routers on the VLAN, OSPF fails to synchronize if the neighbor is not configured.


A passive link does not send or receive OSPF packets.



The number of routers in an OSPF point-to-point link is determined per VLAN, not per link.

All routers in the VLAN must have the same OSPF link type. If there is a mismatch, OSPF attempts to operate, but it may not be reliable.