WAGO 852-1305 Manual page 56

56 Enhanced Features
Queuing Algorithms
"Queuing Algorithms" can be used to maintain separate "Queues" for packets that
can be derived from any single source or any data flow, thus preventing a source
from monopolizing the bandwidth.
SPQ
With SPQ ("Strict Priority Queuing"), the four "Hardware Priority Queues" are
processed sequentially – the highest priority (3) first and the lowest (0) last. Each
"Hardware Queue" transmits all packets in the buffer before the next lower
priority is allowed to transmit its packets. If the lowest "Hardware Priority
Queue" transmits all its packets, the highest starts to transmit its packets again that
it received in the meantime.
WRR
RR ("Round Robin") is a scheduling service that queues packets on a rotating
basis and is only activated when a port has more traffic than it can handle. A
"Queue" is given an amount of bandwidth irrespective of the incoming traffic on
that port. This "Queue" then moves to the back of the list. The next "Queue" is
given an equal amount of bandwidth and then moves to the end of the list and so
on until all "Queues" are processed. The entire process works in a looping fashion
until a "Queue" is empty.
WRR ("Weighted Round Robin") scheduling uses the same algorithm as "Round
Robin" scheduling, but services "Queues" based on their priority and queue
weight (the number you configure in the "Weight Value" field) rather than a fixed
amount of bandwidth. WRR is activated only when a port has more traffic than it
can handle. "Queues" with larger weights get more service than those with
smaller weights. This queuing mechanism is highly efficient in that it divides any
available bandwidth across the different "Traffic Queues" and returns to queues
that have not yet emptied.
DiffServ Function
DiffServ is disabled on the industrial managed switch.
If the DiffServ is disabled, the "802.1p Tag Priority" is used.
WAGO-ETHERNET-Zubehör 852
852-1305 8/4-Port 100BASE-T/1000BASE-SX/LX
Manual
1.1.0