Avaya Configuring Bridging Services Manual de usuario descargar pdf (Pagina 208)

Configuring Bridging Services

6-20

117351-B Rev. 00

Assigning a Priority to an Interface

The interface priority, together with the bridge ID (see “Determining Which

Bridge is the Root Bridge” on page 6-18), determine whether a port becomes the

designated port when the spanning tree algorithm converges. The lower a port’s

priority value, the more likely it is that the port will be the designated port.

The default value for the interface priority is 128. To set the interface priority,

navigate to the interface span prompt and enter:

priority

<value>

value

is any number from 1 to 255.

For example, the following command sets the interface priority to 200:

span/ethernet/2/1#

priority 200

Setting the Path Cost for a Spanning Tree Interface

When a port is the root port, the path cost is the contribution of the path through

this port to the total cost of the path to the root bridge. When an interface is not the

root port, the spanning tree adds the value configured as the path cost to the

designated cost for the root port. For more information about how the spanning

tree configures root ports, refer to “Spanning Tree Algorithm” on page 1-8.

To determine the path cost, use this formula:

Interface path cost = 1000/attached LAN speed in Mb/s

The default for the path cost is 1. To set the path cost, navigate to the interface

span prompt and enter:

path-cost

<value>

value

is any number from 1 to 65535.

For example, if the attached LAN is Ethernet, you would enter 100 for the path

cost (1000/10 = 100) with the following command:

span/ethernet/2/1#

path-cost 100

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Avaya Configuring Bridging Services Manual de usuario Pagina 208