Firewall Filter Actions

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The class-of-service (CoS) settings of a packet determine how that packet should be prioritized and handled by the network. When packets traverse a network device with a firewall filter applied, certain actions taken by the filter may affect the CoS settings of the packet.

The two firewall filter actions that may affect a packet's CoS settings are:

A. Forwarding-class: This action sets the forwarding class of the packet to a specific value, which can be used by the network to prioritize the packet. For example, a packet with a forwarding class of "voice" may be given higher priority than a packet with a forwarding class of "data" to ensure that voice traffic is not interrupted by other network traffic.

B. Scheduler: This action specifies the transmit scheduler to be used for the packet. The scheduler determines the order in which packets are transmitted from the device, which can impact the latency and delay of the packet. By specifying a specific scheduler for the packet, the filter can control the transmission behavior of the packet and influence its CoS settings.

C. Queue: This action directs the packet to a specific output queue based on the packet's destination address or other criteria. This can be used to ensure that packets with certain CoS settings are sent to specific queues that are configured to prioritize traffic with those settings.

D. Loss-priority: This action sets the loss priority of the packet to a specific value, which can be used to indicate the importance of the packet relative to other traffic. Packets with a higher loss priority may be more likely to be delivered, while packets with a lower loss priority may be dropped in favor of higher-priority traffic.

In summary, the firewall filter actions that may affect a packet's CoS settings are forwarding-class and scheduler. These actions can be used to control the prioritization and transmission behavior of the packet based on its CoS settings.