Policy based routing cisco pdf

Note that pbr will not be triggered if the incoming packet belongs to an existing connection, or if nat is applied. Mediatrace will show statistics of incorrect interfaces with policybased routing pbr if the pbr does not. To configure pbr on an interface, use the following commands beginning in global configuration mode. Next we need to define the interface where will the pbr wait for packets to enter in the process of policy based routing. Allow or deny paths based on the identity of a particular end system, an application protocol, or the. New ccna routing and switching 200125 ccna security and ccna voice best ever ccnp route300101 and 642902 and switch and also best rhcerhcsa linux notes for rhel6 and rhel 7 and also ubuntu and pfsense firewall pdf notes. Traditional ip routing forwards packets based only on the destination ip address in the packet.

Policy based routing can be used to overrule your routing table and change the next hop ip address for traffic meeting certain requirements. No match clause in the route map indicates all packets. Protocolindependent configuration guide, cisco ios xe gibraltar 16. Policy based routing pbr provides a method to forward packets by overriding the information available in the ip routing table. Policy based routing configuration task list, page 253 policy based routing configuration examples, page 255 note for a complete description of the pbr commands in this chapter, refer to the cisco ios quality of service solutions command reference at. Once the local router finds a next hop and a usable interface, it routes the packet.

Policy based routing or pbr is a feature for network administrator to manipulate packet routing and forwarding to follow a defined policy set. Policy based routing is a more flexible mechanism for routing packets than destination routing. Pbr gives you a flexible method of routing packets by allowing you to define policies for traffic flows, lessening reliance on routes derived from routing protocols. The route map itself specifies the match criteria and the resulting action if all of the match clauses are met. Policybased routing part1 ccnp best cisco ccna ccnp.

This chapter describes the tasks for configuring policybased routing pbr on a router. By using pbr, customers can implement policies that selectively cause packets to take different paths. Protocolindependent configuration guide, cisco ios xe fuji 16. Pdf a basic description and presentation of what policy based. By attaching pbr for that route map on selected interface the router knows which packets arriving on what interface will be subject to pbr rule that we created above. In policybased routing pbr, for instance, you may use a route map when traffic has to follow a particular path through the internetwork. To enable policy based routing, you must identify which route map to use for policy based routing and create the route map.