多选题What are two characteristics of the OSPF process identifier?（）AIt is needed to identify a unique instance of an OSPF database.BIt is an optional parameter only necessary if multiple OSPF processes are used.CIt is locally significant.DIt is globally insignificantEAll routers in the same OSPF area must have the same process ID to exchange routing information.
多选题
What are two characteristics of the OSPF process identifier?（）
A
It is needed to identify a unique instance of an OSPF database.
B
It is an optional parameter only necessary if multiple OSPF processes are used.
C
It is locally significant.
D
It is globally insignificant
E
All routers in the same OSPF area must have the same process ID to exchange routing information.
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