From: Corbin, Kevin (Kevin.Corbin@LibertyMutual.com)
Date: Thu Apr 17 2003 - 18:23:37 GMT-3
Tony,
You are correct about the 75%, an interesting thing to note is the
bandwidth statement, in addition to route metric calculation as you
stated, CBWFQ also uses it to determine what 75% of the link is, in the
example below he can either issue the max-reserved-bandwidth % command,
or manipulate the bandwidth statement on the interface. Keep in mind
there is a reason for the 75% rule which is to account for additional
control and routing overhead on the link. So unless you are going to
account for *ALL* traffic I would opt to not use either method, and go
with absolute Kbps values with the bandwidth statement, and adhere to
the 75% rule. Just my 2 cents
Serial0/0 is up, line protocol is down
Hardware is PowerQUICC Serial
Description: To R2
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
R4#sho queue s0/0
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max active/max total)
Reserved Conversations 1/1 (allocated/max allocated)
Available Bandwidth 1158 kilobits/sec
R4(config)#int s0/0
R4(config-if)#band 1000
R4(config-if)#exit
R4(config)#exit
R4#sho queue
R4#sho queue s0/0
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max active/max total)
Reserved Conversations 1/1 (allocated/max allocated)
Available Bandwidth 750 kilobits/sec
Kevin
-----Original Message-----
From: Tony Schaffran [mailto:tschaffran@cconlinelabs.com]
Sent: Thursday, April 17, 2003 11:23 AM
To: Gogi Kadeishvili; ccielab@groupstudy.com
Subject: Re: bandwith
First of all, the bandwidth statement on the interface is only used for
routing metric calculations. It is not used to set the actual bandwidth
of the interface.
That being said, I assume your serial interface is a standard fast
serial interface. Speeds up to 2MB. With policy mapping, I believe you
can only reserve 75% of the actual bandwith by default. I think there
is a command to set the max bandwidth to be used to get past that 75%
limit.
I hope this gets you in the right direction.
Tony Schaffran
Network Analyst
CCIE #11071
CCNP, CCNA, CCDA,
NNCSS, NNCDS, CNE, MCSE
www.cconlinelabs.com
"Your #1 choice for Cisco rack rentals."
----- Original Message -----
From: "Gogi Kadeishvili" <gogi@greennet.ge>
To: <ccielab@groupstudy.com>
Sent: Thursday, April 17, 2003 6:27 AM
Subject: bandwith
> Hi all!
> I'm trying to adjust bandwith settings on serial interface, like this:
>
> interface serial 0
> bandwith 2048
> service policy output sssss
>
> policy-map sss
> class 1
> bandwith 1024
> class 2
> bandwith 1024
>
> so it will not work, once you attach the policy to interface, it says,
> not enough bandwith. why is that? looks like one needs to assign
> bandwith of 2048+23 to get two classes of 1024
> regards
> gogi
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