Alcatel-Lucent 7750 SR OS Service Manual page 800

Service router - mobile gateway

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Table of Contents

IES Service Configuration Commands

policy vrrp-policy-id

config>service>ies>if>vrrp

This command creates VRRP control policies. The VRRP policy ID must be created by the policy

command prior to association with the virtual router instance.

The policy command provides the ability to associate a VRRP priority control policy to a virtual

router instance. The policy may be associated with more than one virtual router instance. The priority

events within the policy either override or diminish the base-priority dynamically affecting the in-use

priority. As priority events clear in the policy, the in-use priority may eventually be restored to the

base-priority value.

The policy command is only available in the non-owner vrrp virtual-router-id nodal context. The

priority of owner virtual router instances is permanently set to 255 and cannot be changed by VRRP

priority control policies. For non-owner virtual router instances, if the policy command is not

executed, the base-priority will be used as the in-use priority.

The no form of this command removes any existing VRRP priority control policy association from

the virtual router instance. All such associations must be removed prior to the policy being deleted

from the system.

vrrp-policy-id — The vrrp-policy-id parameter associated the corresponding VRRP priority control

config>service>ies>if>vrrp

The preempt command provides the ability of overriding an existing non-owner master to the virtual

router instance. Enabling preempt mode is almost required for proper operation of the base-priority

and vrrp-policy-id definitions on the virtual router instance. If the virtual router cannot preempt an

existing non-owner master, the affect of the dynamic changing of the in-use priority is greatly

The preempt command is only available in the non-owner vrrp virtual-router-id nodal context. The

owner may not be preempted due to the fact that the priority of non-owners can never be higher than

the owner. The owner will always preempt all other virtual routers when it is available.

Non-owner virtual router instances will only preempt when preempt is set and the current master has

an in-use message priority value less than the virtual router instances in-use priority.

A master non-owner virtual router will only allow itself to be preempted when the incoming VRRP

Advertisement message Priority field value is one of the following:

policy-id with the virtual router instance. The vrrp-policy-id must already exist in the system for

the policy command to be successful.

7750 SR OS Services Guide