Link-Type Support

You can manually configure the OSPFv3 link type for a VLAN. The following table describes the link types.

Table 1. OSPFv3 Link Types
Link Type Number of Routers Description



ExtremeXOS automatically determines the OSPFv3 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 OSPFv3 point-to-point link supports only zero to two OSPFv3 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 OSPFv3 packets.



The number of routers in an OSPFv3 point-to-point link is determined per VLAN, not per link.

All routers in the VLAN must have the same OSPFv3 link type. If there is a mismatch, OSPFv3 attempts to operate, but it may not be reliable.