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DES-7200 Configuration Guide Chapter 7 Policy-based Routing
Configuration
7-4
Note
For details on the next hop of PBR set actions, refer to Rns&track Configuration
Guide and Rns&track Command Reference (for switches) or Link Detection
Configuration Guide and DLDP Command Reference (for routers). IPv6 PBR is
not supported at present.
For linkup of PBR and BFD, refer to BFD Configuration Guide and BFD
Command Reference.
7.1.3 Enable Track Function
Track function can increate the insight of policy-based routing in the change of
networks. When the device perceives that the next hop for forwarding failed,
policy-based routing will rapidly hand the traffic over to the next valid next hop (in
redundant backup mode) or all other valid next hops (in load balancing mode).
For track configuration, refer to Rns&track Configuration Guide. IPv6 PBR does
not support linkup with track.
7.1.4 Enable BFD Function
Linkup of policy-based routing and BFD avoids setting the policy-based routing as
forwarding path when it is not reachable. If the backup forwarding path is
available, the system rapidly hands over to this path.
7.1.5 VRF Selection using Policy-based Routing
The PBR implementation of the VRF selection feature allows you to filter the
packets received on the ports that PBR is applied based on match criteria. Match
criteria is defined in an IP access list or based on packet length. Users can
balance traffic on different VRF instances as required.
In general, the packets received on an interface of a VRF are routed and
forwarded through this VRF. The packets received on an interface of the global
routing table are routed and forward through the global routing table. VRF
selection using policy based routing can remove this limit. This feature supports
VRF successor route, the route across VRFs and the route from VRF to the
global routing table. In VRF successor route, the packets received on an interface
of a VRF are routed and forwarded by the routing table of this VRF. In the route
across VRFs mode, the packets received on an interface of a VRF are routed and
forwarded by the routing table of another VRF. In the route from VRF to the global
routing table mode, the packets received on an interface of a VRF are routed and
forwarded by the global routing table.
7.1.6 Operation Principles
For policy-based routing, first of all, you need to define a route map used to