Policy-Based Routing (Pbr); Overview - Dell Z9500 Configuration Manual

Z-series core and aggregation switche

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

When a router receives a packet, the router decides where to forward the packet 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 transmission control protocol (TCP) across a different next-hop than packets using Internet

control message protocol (ICMP). In these situations, you can a configure switch route packet according to a policy applied to

In another scenario, when the packet comes from one source and wants to go to another 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 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

Destination port

Policy-based Routing (PBR)