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Tuesday, October 26, 2010

Question 155

Explain what technology is being used and determine the packet byte size used? This is from the running-config.

interface FastEthernet0/1
 custom-queue-list 1
!
queue-list 1 protocol ip 2 tcp smtp
queue-list 1 protocol ip 1 tcp www
queue-list 1 protocol ip 1 tcp ftp
queue-list 1 protocol ip 1 tcp ftp-data
queue-list 1 default 3
queue-list 1 queue 1 byte-count 4500
queue-list 1 queue 3 byte-count 9000
!


sh queueing custom
Current custom queue configuration:

List   Queue  Args
1      3      default
1      2      protocol ip          tcp port smtp
1      1      protocol ip          tcp port www
1      1      protocol ip          tcp port ftp
1      1      protocol ip          tcp port ftp-data
1      1      byte-count 4500
1      3      byte-count 9000

1 comments:

Packets Analyzed said...

This is Custom Queuing

The default byte-count is 1500 and therefore the following byte counts in the configuration are

Queue 1 - 4500
Queue 2 - 1500 (does not show up in running-config as it is the default setting)
Queue 3 - 9000

We have decided to make 1500 = %10 and therefore

Queue 1 - %30
Queue 2 - %10
Queue 3 - %60
_______________
All Queues %100

This simplifies the calculation of bandwidth percentages, for example: If the question stated that FTP, FTP-data and WWW should have %30, SMTP %10, and everything else %60, making the default 1500 = %10 simplifies the calculations as we then use this number and multiple it accordingly

%10 X 6 = %60 therefore 1500 X 6 = 9000
%10 X 3 = %30 therefore 1500 X 3 = 3000

The following protocols are assigned to the following queues

Queue 1 – tcp, www, ftp, ftp-data
Queue 2 – tcp, smtp
Queue 3 - All others

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