ZyXEL Communications P-660R-T1 Support Notes page 96

T raditionally, routing is based on the destination address only and the router takes the
s hortest path to forward a packet. IP Policy Routing (IPPR) provides a mechanism to
override the default routing behavior and alter the packet
policy defined by the network administrator. Policy-based routing is applied to
incoming packets on a per interface basis, pr
administrators can use IPPR to distribute traffic among multiple
a network has both the Internet and re
packets to the Internet using one polic
using another policy. See th
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 se
precedence or TOS (Type of Service) values in the IP header at the periphery o
network to enable the backbone to prioritize traffic.
Cost Savings- IPPR allows organizations to distribute interactive traffic on
hig h-b ndwidth, high-cost path while usin a
Load Sharing- Network administrato
multiple paths.
•
How does the IPPR work?
A policy defines the matching criteria and the action to take when a packet meets the
criteria. The action is taken only whe
source address and port, IP protocol (ICMP, UDP, TCP,etc), destination address and
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ior to the normal routing. Network
mote node connections, we can route the Web
y and route the FTP packets to the remote LAN
e figure below.
g low-path for batch traffic.
rs can use IPPR to distribute traffic among
n all the criteria are met. The criteria include the
P-660 series Support Notes
forwarding based on the
paths. For example, if
tting the
f the
95