From: Jongsoo.Kim@Intelsat.com
Date: Thu Oct 28 2004 - 11:08:55 GMT-3
I think WREQ or queue-limit can be used with Fair Queue, which is of course
subject of critic audit.
Fair Queue defines queue depth (congestive-discard-threshold, DF=64 )and
WRED or Queue limit define how packets should be dropped when the queue
depth exceeds. With WRED, the packet will be dropped based on WRED feature
and with queue limit, the packet will be dropped based on FIFO
By the way, I am taking lab tomorrow and hope this doesn't show up.
Regards
Jongsoo
-----Original Message-----
From: AK Singh [mailto:singh.anand@gmail.com]
Sent: Thursday, 28 October, 2004 3:16 AM
To: John Matus
Cc: Cisco Net; Group Study
Subject: Re: WRED without fairq / cb-wfq ?
I am still not clear if fair queuing needs to be enabled before
configuring WRED (say on ethernet interface)
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fqos
_c/fqcprt3/qcfwred.htm#22292
The documentation and example doesn't say that. I also observe that
both fair-queue and random detect seems to be mutually exclusive and
if you configure one other is gone, In fact if "random detect" is
configured, IOS won't let you configure "fair-queue". See the log
below. Can someone clear this doubt for me:
R2#sh running-config interface e0/2
Building configuration...
Current configuration : 216 bytes
!
interface Ethernet0/2
ip address 169.1.27.2 255.255.255.0
no ip mroute-cache
half-duplex
end
R2#c
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#interface ethernet 0/2
R2(config-if)#fair-queue
R2(config-if)#^Z
R2#sh running-config interface e0/2
*Mar 6 05:47:03.976: %SYS-5-CONFIG_I: Configured from console by console
R2#sh running-config interface e0/2
Building configuration...
Current configuration : 228 bytes
!
interface Ethernet0/2
ip address 169.1.27.2 255.255.255.0
no ip mroute-cache
half-duplex
fair-queue
end
R2#sh queueing interface e0/2
Interface Ethernet0/2 queueing strategy: fair
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 0/0 (allocated/max allocated)
Available Bandwidth 7500 kilobits/sec
R2#c
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#int e0/2
R2(config-if)#ran
R2(config-if)#random-detect
R2(config-if)#^Z
R2#sh queueing interface e0/2
Interface Ethernet0/2 queueing strategy: random early detection (WRED)
Exp-weight-constant: 9 (1/512)
Mean queue depth: 0
class Random drop Tail drop Minimum Maximum Mark
pkts/bytes pkts/bytes thresh thresh prob
0 0/0 0/0 20 40 1/10
1 0/0 0/0 22 40 1/10
2 0/0 0/0 24 40 1/10
3 0/0 0/0 26 40 1/10
4 0/0 0/0 28 40 1/10
5 0/0 0/0 31 40 1/10
6 0/0 0/0 33 40 1/10
7 0/0 0/0 35 40 1/10
rsvp 0/0 0/0 37 40 1/10
R2#sh running-config interface e0/2
Building configuration...
Current configuration : 232 bytes
!
interface Ethernet0/2
ip address 169.1.27.2 255.255.255.0
no ip mroute-cache
half-duplex
random-detect
end
R2#c
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#in
R2(config)#interface e0/2
R2(config-if)#fa
R2(config-if)#fair-queue
Must remove RED configuration first.
R2(config-if)#^Z
R2#
*Mar 6 05:47:56.596: %SYS-5-CONFIG_I: Configured from
On Wed, 27 Oct 2004 22:16:14 -0700, John Matus <jmatus@pacbell.net> wrote:
> now, a question that has come up is weather you have to specify a queue
size
> when you configure 'fair-queue'. from what i'm told the default queue
size
> is zero so unless you create queues the whole thing doesn't practically
> work......
> anyone care to comment on this?
>
>
>
>
> Regards,
>
> John D. Matus
> MCSE, CCNP
> Office: 818-782-2061
> Cell: 818-430-8372
> jmatus@pacbell.net
> ----- Original Message -----
> From: "Cisco Net" <network.cisco@gmail.com>
> To: "Group Study" <ccielab@groupstudy.com>
> Sent: Wednesday, October 27, 2004 7:13 PM
> Subject: WRED without fairq / cb-wfq ?
>
> > Hi
> > Is fairq or cb-wfq is a requirement for wred... ?
> > So far i was thinking this is the requirement until somebody mentioned
me
> > it is not a requirement.So i am seeking help here to verify this..
> >
> > 1) Can i enable wred on an ethernet interface without changing the fifo
to
> > fairq
> > queueing. I tried and it dows not complain but i am not whether i
> > am doing right
> > or wrong.
> > 2) I know that in MQC i can enable on class-default. Also the default
> > q is fair q here
> > How about if i have a class with cbwfq (bandwith) and LLQ
> > (priority). Can i use
> > wred on these classes...
> >
> > Thank you for your help..
> > Regards
> > Cert
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
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