11-29-2007 09:33 AM - edited 03-05-2019 07:43 PM
Guys,
Please can someone let us kow a couple of things about this command.
1. Is this command setting a percentage of the port buffer (say 14MB for TX on a WS-X6704-10GE) or a weight of the buffer space. Cisco documentation says weight, but SRND says its a percentage?
2. What is the default percentage of the priority queue for for various port types? is it 15% or 30%
3. in the following URL
http://www.cisco.com/en/US/products/hw/switches/ps708/products_white_paper09186a0080131086.shtml
lets say again for the WS-X6704-10GE card on transmit, it has the following TX Queue Sizes, are these just defaults that can be set with the "wrr-queue queue-limit" command?
Tx Queue Sizes
SP-2.2MB
Q7-10KB
Q6-10KB
Q5-10KB
Q4-10KB
Q3-2.2MB
Q2-2.9MB
Q1-7.2MB
This is not very clear atall and if anyone has experience of this, pls could you help.
Many thx,
Ken
11-29-2007 10:47 AM
Also, another important factor that ties into this from the SRND is the following
For CatOS, you specifically set the PQ so even if this was percentage or ratio, this would eqaute to the same figure
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Example 2-75 Catalyst 6500 (PFC3) CatOS-1P3Q8T Queuing Example
CAT6500-PFC3-CATOS> (enable) set qos txq-ratio 1p3q8t 5 25 40 30
! Allocates 5% for Q1, 25% for Q2, 40% for Q3 and 30% for Q4 (PQ)
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but for IOS, you donot set the PQ queue-limit (see below), so is the command below, a weighted ratio, ie 5 over 70 (3.5%), 25 over 70 (17.5%) and 40 over 70 (28%)
or the actual percentage figure?
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Example 2-76 Catalyst 6500 IOS-1P3Q8T Queuing Example
CAT6500-PFC3-IOS(config)# interface range GigabitEthernet1/1 - 48
CAT6500-PFC3-IOS(config-if)# wrr-queue queue-limit 5 25 40
! Allocates 5% for Q1, 25% for Q2 and 40% for Q3
------------------------------------------------------------------------------------------------------------------------
Many thx indeed,
Ken
11-29-2007 10:55 AM
Take a look at this link for definitiion about "wrr-queue queue limit" and usage.
hth,
hieu
11-29-2007 11:03 AM
Hi there :)
Yes, I have seen it, but compare that to the SRND guide http://www.cisco.com/application/pdf/en/us/guest/netsol/ns432/c649/ccmigration_09186a008049b062.pdf
and it does not become clear as they refer to percentages rather than weights?
I am very confused?
Many thx for the reply hieu :)
Ken
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