Allied Telesis x900-12 Manuale di configurazione del software - Pagina 13
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Full QoS scenario - tiered services for a single customer
In this section, we will build up a relatively complex QoS configuration to support a scenario
requiring quite precise control over the traffic passing through the switch.
The scenario is an ISP providing connectivity for a customer, and offering different levels of service
for different types of traffic.
The customer is connected to port 1 of the switch, and the uplink to the ISP is on port 24 of the
switch.
Customer LAN
Step 1 - Set the egress bandwidth limiting
The service offered by the ISP puts a limit on the total bandwidth of traffic that the customer can
send to the ISP.
This is achieved by setting a maximum bandwidth on the uplink port:
interface port1.0.24
egress-rate-limit 10m
Step 2 - Give better service to some types of traffic than to others
The deal offered to the customer is that their traffic will be treated as belonging to three categories,
and each category of traffic will be given a different level of service:
Gold traffic will be limited to, say, 2Mbps, but the ISP will guarantee delivery of the traffic across
their network, with a low latency.
Silver traffic will have a much higher limit, but when congestion occurs, it will be throttled back in
favour of Gold traffic, if necessary. The ISP will guarantee to deliver up to, say 5Mbps of Silver traffic
across its network 90% of the time, but will give no guarantees about latency.
Bronze traffic will also have a high burst limit, but when congestion occurs, will be throttled back
in favour of Gold traffic, and will share the remaining bandwidth with Silver traffic in a Weighted
Round Robin fashion. The ISP makes no guarantees at all with regard to delivery of Bronze traffic
across their network; it will be delivered on a best-effort basis.
Page 13 | AlliedWare Plus™ OS How To Note: QoS
Full QoS scenario - tiered services for a single customer
ISP
Port 24
uplink to the ISP