Chapter 20: Configuring Policy-Based Routing; Policy-Based Routing Overview - Avaya G250 Administration

Chapter 20: Configuring policy-based routing

This chapter provides information about configuring policy-based routing on the G250/G350
and contains the following sections:

Policy-based routing overview

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Applications
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Configuring policy-based routing
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PBR rules
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Next hop lists
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Editing and Deleting PBR lists
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Displaying PBR lists
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Application example
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Policy-based routing overview
Policy-based routing allows you to configure a routing scheme based on traffic's source IP
address, destination IP address, IP protocol, and other characteristics. You can use
policy-based routing (PBR) lists to determine the routing of packets that match the rules defined
in the list. Each PBR list includes a set of rules, and each rule includes a next hop list. Each next
hop list contains up to 20 next hop destinations to which the G250/G350 sends packets that
match the rule. A destination can be either an IP address or an interface.
Policy-based routing takes place only when the packet enters the interface, not when it leaves.
Policy-based routing takes place after the packet is processed by the Ingress Access Control
List and the Ingress QoS list. Thus, the PBR list evaluates the packet after the packet's DSCP
field has been modified by the Ingress QoS List. See
Packets on page 448.
Note:
The Loopback 1 interface is an exception to this rule. On the Loopback 1
Note:
interface, PBR lists are applied when the packet leaves the interface. This
enables the PBR list to handle packets sent by the G250/G350 device itself, as
explained below.
Note:
ICMP keepalive provides the interface with the ability to determine whether a
Note:
next hop is or is not available. See
— an overview of policy-based routing
— a description of common policy-based routing applications
— instructions on how to configure rules
— instructions on how to configure next hop lists
— instructions on how to modify and delete PBR lists
— instructions on how to view the configuration of PBR lists
— an example of a policy-based routing application
— instructions on how to configure policy-based routing
Figure 48: Applying Policy Lists to
ICMP keepalive on page 167.
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