Trunk load balancing using port layers

Trunk load balancing using port layers allows the use of TCP/UDP source and destination port number for trunk load balancing. This is in addition to the current use of source and destination IP address and MAC addresses. Configuration of Layer 4 load balancing would apply to all trunks on the switch. Only non-fragmented packets will have their TCP/UDP port number used by load balancing. This ensures that all frames associated with a fragmented IP packet are sent through the same trunk on the same physical link.

The priority for using layer packet information when this feature is enabled is as follows:

Procedure
  1. L4-based: If the packet protocol is an IP packet, use Layer 4, or Layer 3, or Layer 2 information, whichever is present, in that order.
  2. L3-based: If the packet protocol is an IP packet, use Layer 3, or Layer 2 information, whichever is present, in that order.
  3. L2-based: If the packet protocol is an IP packet use Layer 2 information.
  4. For all options, if the packet is not an IP packet, use Layer 2 information.