Configuring Area Ranges (Route Summarization For Abrs) - Edge-Core ECS4610-24F Management Manual

24-port layer 3 gigabit ethernet switch

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Figure 340: Displaying Information on NSSA and Stub Areas

An OSPF area can include a large number of nodes. If the Area Border

Router (ABR) has to advertise route information for each of these nodes,

this wastes a lot of bandwidth and processor time. Instead, you can use

UMMARIZATION FOR

the Routing Protocol > OSPF > Area Range (Add) page to configure an ABR

to advertise a single summary route that covers all the individual networks

within its area. When using route summaries, local changes do not have to

be propagated to other area routers. This allows OSPF to be easily scaled

for larger networks, and provides a more stable network topology.

Figure 341: Route Summarization for ABRs

Configuring the Open Shortest Path First Protocol (Version 2)

"router ospf" on page 1043

"area range" on page 1049

Use the Area Range configuration page to summarize intra-area routes,

and advertise this information to other areas through Area Border

Routers (ABRs). The summary route for an area is defined by an IP

address and network mask. You therefore need to structure each area

with a contiguous set of addresses so that all routes in the area fall

within an easily specified range. If it is not possible to use one

contiguous set of addresses, then the routes can be summarized for

several area ranges.This router also supports Variable Length Subnet

Masks (VLSMs), so you can summarize an address range on any bit

boundary in a network address.

To summarize the external LSAs imported into your autonomous

system (i.e., local routing domain), use the Summary Address

configuration screen

This router supports up five summary routes for area ranges.

| Unicast Routing

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