From: marvin greenlee (marvin@ccbootcamp.com)
Date: Sat Nov 06 2004 - 00:00:53 GMT-3
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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