From: Joseph D. Phillips (josephdphillips@fastmail.us)
Date: Sat Nov 06 2004 - 04:11:00 GMT-3
Well, that's what the config says. That's what confused me.
I guess I'd have to lab it up again and see if a show policy reveals it
as percentage of bandwidth versus absolute bps.
marvin greenlee wrote:
>You have a total of 4 queues
>queue 1 5000 bytes
>queue 2 3000 bytes
>queue 3 500 bytes
>queue 4 1500 bytes (default byte-count for custom queueing)
>
>Assuming that there is traffic in all the queues, the traffic will be sent
>round robin, based on the queue sizes. For one cycle, a total of 10000
>bytes is sent. Of that cycle, 5000 is www (queue 1), so www would receive
>50% of the bandwidth (5000/10000). The other queues are also calculated
>based on the byte count's relation to the total bytes sent in the cycle.
>
>30% - queue 2 (FTP / FTP data)
>5% - queue 3 (telnet)
>15% - queue 4 (default)
>
>You don't need to reserve bandwidth for the default traffic, but the other
>reservations are made, bringing the total for the service policy to 85%, and
>the max-reserved bandwidth must be adjusted since the default is to only
>allow you to reserve 75% of the interface bandwidth. The default queue
>length for a queue is 20 packets. Since the WWW queue had a limit of 30,
>that was brought to the class.
>
>Are you sure that the answer values aren't bandwidth percent values?
>
>With the bandwidth values in K, the reservation would be a total of 85K.
>
>- Marvin Greenlee, CCIE#12237
>Network Learning Inc
>marvin@ccbootcamp.com
>www.ccbootcamp.com (Cisco Training)
>
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>Joseph D. Phillips
>Sent: Friday, November 05, 2004 6:35 PM
>To: group study
>Subject: QoS [bcc][faked-from]
>Importance: Low
>
>Regarding Internetworkexpert Lab 15:
>
>Could someone please explain to me the math used to equate the following
>custom queueing config (or at least send me a Cisco link explaining it)....
>
>interface e0/1
> custom-queue-list 1
>queue-list 1 protocol ip 1 tcp www
>queue-list 1 protocol ip 2 tcp ftp
>queue-list 1 protocol ip 2 tcp ftp-data
>queue-list 1 protocol ip 3 tcp telnet
>queue-list 1 default 4
>queue-list 1 queue 1 byte-count 5000 limit 30
>queue-list 1 queue 2 byte-count 3000
>queue-list 1 queue 3 byte-count 500
>
>...to this...........
>
> class-map match-all migrate-ftp
> match protocol ftp
> class-map match-all migrate-www
> match protocol http
> class-map match-all migrate-telnet
> match protocol telnet
> policy-map migrate
> class migrate-www
> bandwidth 50
> queue-limit 30
> class migrate-ftp
> bandwidth 30
> class migrate-telnet
> bandwidth 5
>interface Ethernet0/1
> max-reserved-bandwidth 85
> service-policy output migrate
>
>(By the way I couldn't do bandwidth 5 under the policy-map.. the lowest
>value was 8.)
>
>
>????????
>
>If the byte-count is used to determine the bandwidth, www traffic, for
>instance, would be limited to 40,000 bps which is .0004 of the
>transmission rate the link supports (Ethernet).
>
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