ZyXEL Communications MSC1000G Series, User Manual

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Chapter 11 Profile Screens
Management Switch Card User’s Guide
401
11.23.5 Reference: IPQoS and Modified IEEE 802.1p to Switch Queue
Mapping
Changing the IEEE 802.1p to switch queue mapping is not recommended since it may result in
unexpected queuing behavior. This is because even if you change the mapping between the IEEE
802.1p priorities and the switch queues, the system still uses the same mapping between the
switch queues and the IPQoS profile queues. Here are some examples.
Queue Id This is the index number of queues listed in the following table according to what you selected in
the
Number of Queues field.
PIR PIR is Peak Information Rate. Enter the maximum data rate (128~32768 kbps) allowed to flow
through this device at peak hour. You must enter the number which is a multiple of 64. See
Section 11.23 on page 385 for more information.
CIR CIR is Committed Information Rate. Enter the maximum data rate (64~65532 kbps) guaranteed
to flow through this device all the time. You must enter the number which is a multiple of 64.
See
Section 11.23 on page 385 for more information.
Note: CIR < PIR <= two times of CIR in a queue. For example, CIR is 1024, you must enter the
PIR in the same queue equal or less than 2048 (2 x 1024).
PBS PBS is Peak Burst Size. Enter the maximum packet size (3072~65536 bytes) allowed to flow
through this device at peak hour. You must enter the number which is a multiple of 256. See
Section 11.23 on page 385 for more information.
CBS CBS is Committed Burst Size. Enter the maximum packet size (3072~65536 bytes) guaranteed
to flow through this device all the time. You must enter the number which is a multiple of 256.
See
Section 11.23 on page 385 for more information.
Note: The CBS should be equal to or less than PBS in a queue.
Level Set the queue’s priority level. The larger the number, the higher the priority.
Weight You can configure different IPQoS profiles with queues that have the same queue priority level.
IPQoS then uses Weighted Round Robin (WRR) scheduling to service these queues on a rotating
basis based on their queue weight. Use these fields to set the priority weight (1~127) of each
queue in an IPQoS profile. The higher a queue’s weight, the more service it gets.
Apply Click Apply to save the changes in this screen to the system’s volatile memory. The system
loses these changes if it is turned off or loses power, so use the Config Save link on the
navigation panel and then the Save button to save your changes to the non-volatile memory
when you are done configuring.
New While you are modifying a profile, you can click New to start configuring a fresh profile without
saving your changes.
Cancel Click Cancel to start configuring the screen again.
Index This is the index number of the IPQoS profile.
Name This is the name of the IPQoS profile.
Modify Select a profile’s Select radio button and click Modify to edit the profile.
Delete Select a profile’s Select radio button and click Delete to remove the profile.
Table 184
IPQoS Profile (continued)
LABEL DESCRIPTION