From: Scott M Vermillion (scott_ccie_list@it-ag.com)
Date: Sat Oct 25 2008 - 18:37:29 ARST
Hi Roger,
QoS tools reference the *configured* bandwidth according to the 'bandwidth
nnn' command _OR_ the default BW, which as you noted would be 1544 kbps for
all serial interfaces; QoS mechanisms do not reference the actual clock rate
of a serial interface. The need to decouple bandwidth from clock rate
becomes apparent when you consider a FR circuit that's being
clocked/signaled at a speed several times that of the contracted CIR.
So yes, whenever you're implementing any kind of QoS in your network and you
have serial interfaces involved, manually set the bandwidth according to the
service you reasonably expect to receive end-to-end in the network, whether
that be higher than the tail circuit clock rate or lower.
Now for lab purposes, I'd be paying a visit to my friendly neighborhood
proctor! ;-)
Cheers,
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Roger RPF
Sent: Saturday, October 25, 2008 3:32 AM
To: ccielab@groupstudy.com
Subject: question regarding QoS on serial interfaces
Hi group,
I have a question regarding QoS on serial links, I need confirmation. If a
task says for example: Apply 10% of the interface bandwidth to telnet and
20% to www, and the whole story has to be applied to Ser0/0 interface."
class-map telnet
match protocol telnet
class-map www
match protocol www
!
policy-map test
class telnet
bandwidth percent 10
class www
bandwidth percent 20
!
int ser0/0
service-policy output test
Question:
--------------
What about the bandwidth statement? If I check the clock rate of the
interface with sh control ser0/0, I see that the clock is set to 2Mb (for
example). Per default, my s0/0 interface has a bandwidth of 1.544Mb.
So what do you do in order to fulfill the task? Under the interface, set the
command bandwidt 2000? Leave it as it is, but then I guess the percentage
values are not calculated correctly, isn't it?
To me, if I'm using percentage values in such a scenario, I must set the
bandwidth command, isn't it?
regards
Roger
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