ZyXEL Communications NXC5200 User Manual page 270

Chapter 19 Application Patrol
Priority Effect
Here the configured rates total more than the available bandwidth. Because server
A has higher priority, it gets up to it's configured rate (800 kbps), leaving only 200
kbps for server B.
Table 97 Priority Effect
POLICY
A
B
Maximize Bandwidth Usage Effect
With maximize bandwidth usage enabled, after each server gets its configured
rate, the rest of the available bandwidth is divided equally between the two. So
server A gets its configured rate of 300 kbps and server B gets its configured rate
of 200 kbps. Then the NXC divides the remaining bandwidth (1000 - 500 = 500)
equally between the two (500 / 2 = 250 kbps for each). The priority has no effect
on how much of the unused bandwidth each server gets.
So server A gets its configured rate of 300 kbps plus 250 kbps for a total of 550
kbps. Server B gets its configured rate of 200 kbps plus 250 kbps for a total of
450 kbps.
Table 98 Maximize Bandwidth Usage Effect
POLICY
A
B
Priority and Over Allotment of Bandwidth Effect
Server A has a configured rate that equals the total amount of available
bandwidth and a higher priority. You should regard extreme over allotment of
traffic with different priorities (as shown here) as a configuration error. Even
though the NXC still attempts to let all traffic get through and not be lost,
regardless of its priority, server B gets almost no bandwidth with this
configuration.
Table 99 Priority and Over Allotment of Bandwidth Effect
POLICY
A
B
270
CONFIGURED RATE MAX. B. U. PRIORITY ACTUAL RATE
800 kbps
1000 kbps
CONFIGURED RATE
300 kbps
200 kbps
CONFIGURED RATE
1000 kbps
1000 kbps
Yes 1
Yes 2
MAX. B. U. PRIORITY ACTUAL RATE
Yes 1
Yes 2
MAX. B. U. PRIORITY
Yes 1
Yes 2
800 kbps
200 kbps
550 kbps
450 kbps
ACTUAL RATE
999 kbps
1 kbps
NXC5200 User's Guide