Avaya Configuring IP, ARP, RIP, and OSPF Services Instrukcja Użytkownika Pobierz pdf (Strona 178)

Configuring IP, ARP, RIP, and OSPF Services

6-8

117356-E Rev 00

Configuring the Metric Type for an ASE Advertisement

Each ASE that a boundary router injects into the AS includes a type 1 or type 2

metric. The type 1 metric is equivalent to the metric of the non-OSPF route. The

type 2 metric is either the metric of the non-OSPF route or the weight value

calculated for that route.

Figure 6-1

, for example, shows three routers in an OSPF domain. Router A and

router B are both configured to generate ASE routes using the route weight as the

type 2 metric. Router A and router B both learn a route to destination X. The

following steps occur:

1. Boundary router A learns a route to destination X via EGP.

2. Boundary router A advertises the route to the internal router as an OSPF ASE

route. The type 2 metric in the advertisement contains the route weight value

calculated for the EGP route to destination X.

3. Boundary router B learns a route to destination X via BGP.

4. Boundary router B advertises the route to the internal router as an OSPF ASE

route. The type 2 metric in the advertisement contains the route weight value

calculated for a BGP route.

5. To determine the preferred route, the internal router compares the type 2

metrics -- the EGP route weight and the BGP route weight.

6. The internal router chooses the BGP route -- the route with the lower weight.

5. Set the

AS Boundary Router

parameter.

Click on

Help

or see the parameter

description on page A-36

6. Click on

. You return to the Configuration Manager

window.

Note:

This parameter applies to boundary routers only.

Site Manager Procedure

(continued)

You do this System responds

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Avaya Configuring IP, ARP, RIP, and OSPF Services Instrukcja Użytkownika Strona 178