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Q: Why do we need trunking in switches? (and in server NIC as well)
Reason 1. Compete with Stackable LAN switch solution
Reason 2. Provide 4 Fast Ethernet NIC(200Mbps x4) as the alternative for
Gigabit Ethernet NIC (800Mbps~=1000Mbps)
The LAN switch with port trunking feature, user can expand their network by "stack" more switch with existing
one. We called it is a 'pseudo' stackable switch solution. Most of net manager will connect workgroup server
into LAN switch port for better performance. In this case, the trunking feature from the Server NIC not only can
provide aggregate bandwidth, but also provide link redundancy and load balancing. For example, the 4-port
server NIC can have 800Mbps bandwidth capacity to the switch with port trunking feature.
Q: What's the benefit of choicing 4-port server NIC, instead of Gigabit NIC?
User can use current Fast Ethernet technology to enjoy the high bandwidth(800Mbps,max.) near Gigabit Ethernet.
Technical
Q: How does the port trunking function work in DES-5024 and DES-3224 ?
The DES-5024 and DES-3224 support port trunking feature. If there are more than two switches connected together,
the switches can be connected through more than one port. The bandwidth between two switches will not be
constrained to be 100*2 Mbps. Bandwidth constraints depend on how many ports are connected together. Please refer
to the following diagram. Port 1 and 2 of switch #1 are connected to port 1 and 2 of switch #2. Port 9,10,11,12 of
switch #1 are connected to port 5,6,7,8 of switch #3. The bandwidth between switches 1 and 2 can be up to 200*2
Mbps, the bandwidth between switch 1 and 3 can be up to 400*2 Mbps. For DES-3224 or DES-50xx, port trunking
feature is flexible, it can be 2~8 port per trunk group, maximum trunk group can support up to 7.
Switch #2
Switch #1
Inter switch port trunking
Switch #3
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