Information Technology Reference
In-Depth Information
OSPF Stub Network Types
Table 8-5
OSPF Area Stub Type
Description
LSA Type Not Permitted
Stub area
No OSPF External LSA
Type 5
Totally stubby
No OSPF External and Summary LSA
Type 3 and Type 5
NSSA
No OSPF External, Type 7 produced by
NSSA
Type 5
OSPF Summary
The characteristics of OSPF are summarized as follows:
•
Link-state routing protocol.
•
Uses IP protocol 89.
•
Classless Protocol (supports VLSMs).
•
Metric is cost (based on interface bandwidth).
•
Sends partial route updates only when there are changes.
•
Routes labeled as intra-area, interarea, external type-1, or external type-2.
•
Support for authentication (cleartext and md5).
•
Uses Dijkstra algorithm to calculate SPF tree.
•
Default administrative distance is 110.
•
Uses multicast 224.0.0.5 (ALLSPFrouters).
•
Uses multicast 224.0.0.6 (ALLDRrouters.
IS-IS Summary
The characteristics of IS-IS are summarized as follows:
•
Link-state protocol.
•
Uses OSI PDUs between ISs.
•
Classless Protocol (supports VLSMs).
•
Default metric is set to 10 for all interfaces.
•
Arbitrary metric: single link max = 64, path max = 1024.
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