Policy-Based Routing (Pbr); Overview - Dell S4048–ON Configuration Manual

S-series 10gbe switches

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Policy-based Routing (PBR)

Policy-based Routing (PBR) allows a switch to make routing decisions based on policies applied to an interface.

When a router receives a packet it normally decides where to forward it based on the destination address in the packet, which is

used to look up an entry in a routing table. However, in some cases, there may be a need to forward the packet based on other

criteria: size, source, protocol type, destination, and so on. For example, a network administrator might want to forward a packet that

uses TCP across a different next-hop than packets using ICMP. In these situations, you can a configure switch route packet

according to a policy applied to interfaces.

When the packet comes from this source and wants to go to that destination, then route it to this next-hop or onto that specific

interface. This permits routing over different links or towards different networks even while the destination is the same but

depending on where the packet originates.

To enable a PBR, create a redirect list. Redirect lists are defined by rules, or routing policies. You can define following parameters in

routing policies or rules:

IP address of the forwarding router (next-hop IP address)

Protocol as defined in the header

Source IP address and mask

Destination IP address and mask

Policy-based Routing (PBR)