Trunking - EverFocus ES0812-31 User Manual

4.9 Trunking

Port trunk allows multiple links to be bundled together and act as a single physical
link for increased throughput. It provides load balancing, and redundancy of links in a
switched inter-network. Actually, the link does not have an inherent total bandwidth
equal to the sum of its component physical links.
Traffic in a trunk is distributed across an individual link within the trunk in a
deterministic method that called a hash algorithm. The hash algorithm automatically
applies load balancing to the ports in the trunk. A port failure within the trunk group
causes the network traffic to be directed to the remaining ports. Load balancing is
maintained whenever a link in a trunk is lost or returned to service. This switch may
use Source MAC Address or a combination of Source MAC Address and Destination
MAC Address to be the selection for Trunk Hash Algorithm.
Traffic pattern on the network should be considered carefully before applying it.
When a proper hash algorithm is used, traffic is kind of randomly decided to be
transmitted across either link within the trunk and load balancing will be seen.
This switch supports one trunk group, port 9 and Port 10. Trunk hash algorithm
support Source MAC, Source&Destination MAC Address.
System Priority: This column allows you to enable or disable Loopback

Detection function.
Link Aggregation Algorithm:

MAC Src: Hash Algorithm based on Source MAC Address.

MAC Src&Dst: Hash Algorithm based on Source & Destination MAC

Address XOR result.
Figure 9-1
42
PoE Switch