OSPF Edge Mode
OSPF Edge Mode is a subset of OSPF available on platforms with an Advanced Edge license.
There are two restrictions on OSPF Edge Mode:
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At most, four Active OSPF VLAN interfaces are permitted. There is no restriction on the number of Passive interfaces.
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The OSPF Priority on VLANs is 0, and is not configurable. This prevents the system from acting as a DR or BDR.