Administration of the Avaya G350 Media Gateway - Avaya Support

Configuring policy-based routingModifying rulesTo modify a policy-based routing rule, you must enter the context of the rule and redefine therule criteria.To enter a rule context:1. Enter the context of the PBR list to which the rule belongs.2. Type the command ip-rule, followed by the number of the rule you want to modify. Forexample, to create rule 1, type ip-rule 1.To view the rules that belong to a PBR list, enter the list’s context and type ip show-rule.Rule criteriaThe rule criteria for PBR rules are largely the same as the rule criteria for other policy list rules.Refer to Rule criteria on page 262.In addition, PBR rules can use the packet’s DSCP field as a rule criteria. Use the dscpcommand, followed by a DSCP value (from 0 to 63) to apply the rule to all packets with thespecified DSCP value.Unlike other policy lists, PBR lists do not use composite operations. Thus, there is nooperation command in the context of a PBR rule. Instead, PBR lists use next hop lists. For anexplanation of next hop lists, see Next Hop Lists on page 280.Use the next-hop list command, followed by the list number of a next hop list, to specify anext hop list for the G350 to apply to packets that match the rule. You can specify DestinationBased Routing instead of a next hop list, in which case the G350 applies destination-basedrouting to a packet when the packet matches the rule.If the next hop list specified in the rule does not exist, the G350 applies destination-basedrouting to packets that match the rule.Next Hop ListsPBR rules include a next hop list. When the rule matches a packet, the G350 routes the packetaccording to the specified next hop list.This section describes next hop lists and contains the following topics:● Next hop list overview — an overview of next hop lists● Modifying next hop lists — instructions on how to modify a next hop list280 Administration of the Avaya G350 Media Gateway