GarrettCom 6K25e 사용자 설명서

Magnum 6K25e Gigabit Fiber Switch            Installation and User Guide (10/07) 

 

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Quality of Service means providing consistent predictable data delivery to 

users from datagram paths that go all across a network.  As a LAN device, the Magnum 

6K25e can do its part to prevent any QOS degradation while it is handling Ethernet 

traffic through its ports and buffers. 

 

The Magnum 6K25e switching hardware supports the IEEE 802.1p standard 

and fulfills its role in support of QOS, giving packet processing priority to priority tagged 

packets according to the 802.1p standard.  In addition to hardware support for QOS, the 

MNS software (R2) supports two priority queues that can be shared across the eight 

levels of defined packet priorities for application-specific priority control by the user 

through software configuration settings. 

Magnum 6K25e’s are store-and-forward switches.  Each frame (or packet) is 

loaded into the Switch’s memory and inspected before forwarding can occur.  This 

technique ensures that all forwarded frames are of a valid length and have the correct 

CRC, i.e., are good packets.  This eliminates the propagation of bad packets, enabling all 

of the available bandwidth to be used for valid information.  

 

While other switching technologies (such as "cut-through" or 

"express") impose minimal frame latency, they will also permit bad frames to propagate 

out to the Ethernet segments connected.  The "cut-through" technique permits collision 

fragment frames (which are a result of late collisions) to be forwarded which add to the 

network traffic.  Since there is no way to filter frames with a bad CRC (the entire frame 

must be present in order for CRC to be calculated), the result of indiscriminate cut-

through forwarding is greater traffic congestion, especially at peak activity.  Since 

collisions and bad packets are more likely when traffic is heavy, the result of store-and-

forward operation is that more bandwidth is available for good packets when the traffic 

load is greatest.  

When the Magnum 6K25e Switch detects that its free buffer queue space is 

low, the Switch sends industry standard (full-duplex only) PAUSE packets out to the 
devices sending packets to cause “flow control”. This tells the sending devices to 
temporarily stop sending traffic, which allows a traffic catch-up to occur without 
dropping packets.  Then, normal packet buffering and processing resumes. This flow-
control sequence occurs in a small fraction of a second and is transparent to an observer.  

Another feature implemented in Magnum 6K25e Switches is a collision-based flow-
control mechanism (when operating at half-duplex only). When the Switch detects that