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Chapter 3: Getting Started
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Port Trunking Configuration
Port trunking allows using multiple Ethernet network ports in parallel to increase the link speed
beyond the limits of any one single port. The CPC5565 BIOS setup allows enabling or disabling
of port trunking and the selection of a distribution algorithm. Port trunking is disabled by default.
Selecting the Port Trunking Configuration option on the Switch Configuration submenu brings
up the screen shown in
Figure 3-8 where this option can be configured.
Figure 3-8: Port Trunking Configuration Screen
Port trunking provides for higher bandwidth when the links are operational and it also provides
for link redundancy. If one link fails, the traffic is automatically moved to the other link. The on-
board devices may be grouped in A/B pairs (ENET-A and ENET-B, or PMC-A and PMC-B,
etc.). Both of the trunked ports must be of the same speed.
By performing a dynamic hashing algorithm on the SA and/or DA MAC addresses, each packet
destined for the trunk group is forwarded to one of the valid ports within the trunk group. This
method has several key advantages. By dynamically performing this function, the traffic
patterns can be balanced across the ports within a trunk. In addition, the MAC-based algorithm
also provides dynamic fail-over. If a port within the trunk group fails, the other port automatically
assume all traffic designated for the trunk group. It allows for a seamless, automatic
redundancy scheme. This hashing function can be performed on the DA, SA, or DA and SA.
This mechanism does not involve the use of Link Aggregation Control Protocol (LACP). The
ports are statically configured as a two-port trunk. The device that connects to the CPC5565
must be compatible with this configuration.
BIOS SETUP UTILITY
Port Trunking Configuration
ESC
Save and Exit
Select Item
F10
General Help F1
Enable/Disable
port trunking
Enter
Port Trunking
[Disabled]
Select Screen
Change Option
Exit
Advanced