PBR - Policy Based Routing


When implementing Policy Based Routing, the `set ip default next-hop` and the `set ip next-hop` commands perform two different functions.  These are described in detail below:

The `set ip default next-hop` command verifies the existence of the destination IP address in the routing table, and…

-   if the destination IP address exists, the command does not policy route the packet, but forwards the packet based on the routing table.
-   if the destination IP address does not exist, the command policy routes the packet by sending it to the specified next hop.

The `set ip next-hop` command verifies the existence of the next hop specified, and…

-   if the next hop exists in the routing table, then the command policy routes the packet to the next hop.
-   if the next hop does not exist in the routing table, the command uses the normal routing table to forward the packet.


Links:

https://forum.networklessons.com/t/how-to-configure-policy-based-routing/945/73?u=lagapides

https://www.cisco.com/c/en/us/support/docs/ip/ip-routed-protocols/47121-pbr-cmds-ce.html

PBR next-hop and default next-hop

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PBR next-hop and default next-hop

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