ZyXEL Communications ISG50-ISDN User Manual page 408

Chapter 25 Bandwidth Management
Configuration > Bandwidth Management
Table 134
LABEL
DSCP Marking
Bandwidth
Management
Inbound
kbps
Outbound
kbps
Priority
Maximize
Bandwidth
Usage
408
DESCRIPTION
Set how the ISG50 handles the DSCP value of the outgoing packets that match
this policy. Inbound refers to the traffic the ISG50 sends to a connection's
initiator. Outbound refers to the traffic the ISG50 sends out from a connection's
initiator.
Select one of the pre-defined DSCP values to apply or select User Defined to
specify another DSCP value. The "af" choices stand for Assured Forwarding. The
number following the "af" identifies one of four classes and one of three drop
preferences. See Assured Forwarding (AF) PHB for DiffServ on page 299
details.
Select preserve to have the ISG50 keep the packets' original DSCP value.
Select default to have the ISG50 set the DSCP value of the packets to 0.
Configure these fields to set the amount of bandwidth the application can use.
Type how much inbound bandwidth, in kilobits per second, this policy allows the
traffic to use. Inbound refers to the traffic the ISG50 sends to a connection's
initiator.
If you enter 0 here, this policy does not apply bandwidth management for the
matching traffic that the ISG50 sends to the initiator. Traffic with bandwidth
management disabled (inbound and outbound are both set to 0) is automatically
treated as the lowest priority (7).
If the sum of the bandwidths for routes using the same next hop is higher than
the actual transmission speed, lower priority traffic may not be sent if higher
priority traffic uses all of the actual bandwidth.
Type how much outbound bandwidth, in kilobits per second, this policy allows the
traffic to use. Outbound refers to the traffic the ISG50 sends out from a
connection's initiator.
If you enter 0 here, this policy does not apply bandwidth management for the
matching traffic that the ISG50 sends out from the initiator. Traffic with bandwidth
management disabled (inbound and outbound are both set to 0) is automatically
treated as the lowest priority (7).
If the sum of the bandwidths for routes using the same next hop is higher than
the actual transmission speed, lower priority traffic may not be sent if higher
priority traffic uses all of the actual bandwidth.
This field displays when the inbound or outbound bandwidth management is not
set to 0. Enter a number between 1 and 7 to set the priority for traffic that
matches this policy. The smaller the number, the higher the priority.
Traffic with a higher priority is given bandwidth before traffic with a lower priority.
The ISG50 uses a fairness-based (round-robin) scheduler to divide bandwidth
between traffic flows with the same priority.
The number in this field is ignored if the incoming and outgoing limits are both set
to 0. In this case the traffic is automatically treated as being set to the lowest
priority (7) regardless of this field's configuration.
This field displays when the inbound or outbound bandwidth management is not
set to 0. Enable maximize bandwidth usage to let the traffic matching this policy
"borrow" any unused bandwidth on the out-going interface.
After each application or type of traffic gets its configured bandwidth rate, the
ISG50 uses the fairness- based scheduler to divide any unused bandwidth on the
out-going interface amongst applications and traffic types that need more
bandwidth and have maximize bandwidth usage enabled.
for more
ISG50 User's Guide