D-Link DGS-6608 — руководство по настройке BGP с использованием deterministic-med [89/1106]

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DGS-6600 Series Switch bgp deterministic-med

CLI Reference Guide

bgp deterministic-med

Use this command to include the Multi Exit Discriminator (MED) value for

comparison of the best path selection between all paths received from the same

autonomous system. Use the no form of the command to prevent BGP from

considering the MED attribute in path comparison.

bgp deterministic-med

no bgp deterministic-med

Syntax None.

Default The default value is disabled.

Command Mode Router configuration.

Usage Guideline The bgp always-compare-med command on page 71 is used to enable the

comparison of the MED value for paths from neighbors in different autonomous

systems. After the bgp always-compare-med is enabled, all paths for the same

prefix that are received from different neighbors in the same autonomous

system, will be grouped together and sorted by the ascending MED value

(received-only paths are ignored and not grouped or sorted).

The best path selection algorithm then picks the best paths using the existing

rules; the comparison is first made on a per neighbor autonomous system basis

and then on a global basis. The grouping and sorting of paths occurs

immediately after this command is entered. For correct results, all routers in the

local autonomous system must have this command enabled (or disabled).

The bgp deterministic-med command is used to enforce deterministic

comparison of the MED value between all paths received from within the same

autonomous system. When enabled, the result of the selection algorithm is the

same regardless of the order in which the paths are received on the local router.

Example This example shows how to configure to enable comparison of MED values for

autonomous system 65534:

Switch(config)# router bgp 65534

Switch(config-router)# bgp deterministic-med