Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Instrukcja Użytkownika Pobierz pdf (Strona 81)

Configuring Global BGP Parameters

308628-15.0 Rev 00

3-37

Assigning Weight Classes and Values to an AS

You can assign a weight class to any AS number and a weight value to a weight

class. Weights provide a way either to prefer or to avoid routes that pass through

certain ASs. The weights of each AS in a path are added, and the path with the

smallest total weight is the preferred path. An assigned weight can range from 1

through 15 plus an infinity value. Any path containing an AS weight of infinity is

avoided.

AS weight classes allow you to assign multiple weight values to the same AS.

This feature allows you to consider an AS path differently for different networks.

For example, consider a situation in which two networks—192.32.1.0 and

192.32.2.0—are both reachable by two paths. The first path to each network

shares a common AS—AS 5. The second path to each network also shares a

common AS—AS 10. If you want to favor AS 5 in the path to 192.32.1.0 and AS

10 in the path to 192.32.2.0, you can assign one weight class to AS 5 in the path to

network 192.32.1.0 and another class to AS 5 in the path to 192.32.2.0.

When a BGP router receives a new route, it evaluates the route against any

existing accept policies. If after this evaluation the path still is to be used, the

router calculates the total weight of the path. Configure the same AS weights on

all BGP routers in an AS.

You can use Site Manager to assign a weight and a weight class to an AS by

completing the following steps:

Site Manager Procedure

You do this System responds

1. In the Configuration Manager window,

choose

Protocols

The Protocols menu opens.

2. Choose

. The IP menu opens.

3. Choose

BGP

. The BGP menu opens.

4. Choose

Weights

. The BGP AS Weight Parameters window

opens.

5. Click on

Add

. The BGP AS Weights window opens.

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