What Is Ip Policy Routing (Ippr) - ZyXEL Communications P-660R-Tx v3 Series Support Notes

What is IP Policy Routing (IPPR)?

17.
Traditionally, routing is based on the destination address only and the router
takes the shortest path to forward a packet. IP Policy Routing (IPPR) provides
a mechanism to override the default routing behavior and alter the packet
forwarding based on the policy defined by the network administrator.
Policy-based routing is applied to incoming packets on a per interface basis,
prior to the normal routing. Network administrators can use IPPR to distribute
traffic among multiple paths. For example, if a network has both the Internet
and remote node connections, we can route the Web packets to the Internet
using one policy and route the FTP packets to the remote LAN using another
policy. See the figure below.
Use IPPR to distribute traffic among multiple paths

Benefits
Source-Based Routing - Network administrators can use policy-based
routing to direct traffic from different users through different connections.
Quality of Service (QoS)- Organizations can differentiate traffic by setting the
precedence or TOS (Type of Service) values in the IP header at the periphery
of the network to enable the backbone to prioritize traffic.
Cost Savings- IPPR allows organizations to distribute interactive traffic on
high-bandwidth, high-cost path while using low-path for batch traffic.
Load Sharing- Network administrators can use IPPR to distribute traffic
among multiple paths.
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