You can manually configure the OSPFv3 link type for a VLAN. The following table describes the link types.
| Link Type | Number of Routers | Description |
|---|---|---|
|
Auto |
Varies |
ExtremeXOS automatically determines the OSPFv3 link type based on the interface type. This is the default setting. |
|
Broadcast |
Any |
Routers must elect a designated router (DR) and a backup designated router (BDR) during synchronization. Ethernet is an example of a broadcast link. |
|
Point-to-point |
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. |
|
Passive |
A passive link does not send or receive OSPFv3 packets. |
Note
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.