Edge-Core ECS4660-28F Management Manual page 789

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Configuring the Open Shortest Path First Protocol (Version 2)

Figure 484: Configuring OSPF

external network

OSPF looks at more than just the simple hop count. When adding the

shortest path to any node into the tree, the optimal path is chosen on

the basis of delay, throughput and connectivity. OSPF utilizes IP

multicast to reduce the amount of routing traffic required when sending

or receiving routing path updates. The separate routing area scheme

used by OSPF further reduces the amount of routing traffic, and thus

inherently provides another level of routing protection. In addition, all

routing protocol exchanges can be authenticated. Finally, the OSPF

algorithms have been tailored for efficient operation in TCP/IP

OSPFv2 is a compatible upgrade to OSPF. It involves enhancements to

protocol message authentication, and the addition of a point-to-

multipoint interface which allows OSPF to run over non-broadcast

networks, as well as support for overlapping area ranges.

When using OSPF, you must organize your network (i.e., autonomous

system) into normal, stub, or not-so-stubby areas; configure the

ranges of subnet addresses that can be aggregated by link state

advertisements; and configure virtual links for areas that do not have

direct physical access to the OSFP backbone.

To implement OSPF for a large network, you must first organize the

network into logical areas to limit the number of OSPF routers that

actively exchange Link State Advertisements (LSAs). You can then

define an OSPF interface by assigning an IP interface configured on

this router to one of these areas. This OSPF interface will send and

receive OSPF traffic to neighboring OSPF routers.

Autonomous System A

| Unicast Routing

Autonomous System B

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