Cabletron Systems 9032578-05 Using the local-pref Option, For router SSR13, local-prefis set to

Chapter 12: BGP Configuration Guide

Using the local-pref Option

For router SSR12’s CLI configuration file, local-prefis set to 194:

bgp set peer-group as901 local-pref 194

For router SSR13, local-prefis set to 204.

bgp set peer-group as901 local-pref 204

Using the set-pref Option

The formula used to compute the local preference is as follows:

Local_Pref = 254 – (global protocol preference for this route) + set-pref metric

Note: A value greater than 254 will be reset to 254. GateD will only send Local_Pref values between 0 and 254.

In a mixed GateD and non-GateD network, the non-GateD IBGP implementation may send Local_Pref values that are greater than 254. When operating a mixed network of this type, you should make sure that all routers are restricted to sending Local_Pref values in the range metric to 254.

In router SSR12’s CLI configuration file, the import preference is set to 160:

#

#Set the set-pref metric for the IBGP peer group

bgp set peer-group as901 set-pref 100

ip-router policy create bgp-import-source as900 autonomous-system 64900 preference 160

Using the formula for local preference [Local_Pref = 254 - (global protocol preference for this route) + metric], the Local_Pref value put out by router SSR12 is 254 - 160+100 = 194.

For router SSR13, the import preference is set to 150. The Local_Pref value put out by router SSR13 is 254 - 150+100 = 204.

ip-router policy create bgp-import-source as900 autonomous-system 64900 preference 150

Note the following when using the set-prefoption:

•All routers in the same should use the set-pref

network that are running GateD and participating in IBGP option, and the set-prefmetric should be set to the same value.

154 SmartSwitch Router User Reference Manual