Which identifiers can PBR use to forward traffic to the firewall?

Policy-Based Routing (PBR) is a technique that allows network administrators to customize the routing decisions based on policies set for the network traffic. In the context of forwarding traffic to a firewall, the most suitable identifier that PBR can use is the IP address.

The IP address serves as a fundamental attribute that defines the source and destination of the network packets. By utilizing IP addresses, PBR can effectively make decisions on how to route the traffic through the firewall based on predetermined policies associated with those specific addresses. For instance, traffic coming from a certain IP address can be directed to the firewall for inspection or filtering before reaching its intended destination.

While other identifiers such as VLANs and MAC addresses play roles in network topology and addressing, they do not provide the granularity of control and specificity that IP addresses offer in PBR scenarios. Serial numbers are not tied directly to traffic routing decisions and are generally used for device identification or management rather than traffic flow.