KB.15.15

Assigning value of infinity to routes missing MED attribute

Syntax:

[no] bgp bestpath med-missing-as-worst

To configure a Border Gateway Protocol (BGP) routing process to assign a value

of infinity (max possible) to routes that are missing the Multi Exit Discriminator (MED)

attribute (making the path without a MED value the least desirable path), use the

bgp bestpath med missing-as-worst command in router configuration

mode. To return the router to the default behavior (assign a value of 0 to the missing

MED), use the no form of this command.

Setting BGP MED on routes when advertised to peers

Syntax:

[no] bgp default-metric med-out

Causes a BGP MED to be set on routes when they are advertised to peers. This

value applies to all BGP peers. It can be overridden on a per-peer basis. The no

form of this command, no default-metric, removes the configured value.

Specifying a route's preference

Syntax:

[no] distance bgp ext-dist int-dist loc-dist

A route’s preference specifies how active routes that are learned from BGP

(compared to other protocols) will be selected. When a route has been learned

from more than one protocol, the active route will be selected from the protocol

with the lowest preference. Each protocol has a default preference in this selection.

This preference can be overridden by a preference value specified on the peer.

Enabling client-to-client route reflection

Syntax:

[no] bgp client-to-client-reflection

Enables or disables client-to-client route reflection. When acting as a route-reflector,

this functionality is enabled by default.

Specifying cluster ID when BGP router is route-reflector

Syntax:

[no] bgp cluster-id ip-address

Specifies the cluster ID to be used when the BGP router is used as a route-reflector.

The cluster ID default is the router ID.

294 Border Gateway Protocol (BGP)