From: Scott Morris (swm@emanon.com)
Date: Fri Apr 22 2005 - 13:45:51 GMT-3
Correct. Which would make it "otherwise unclassified traffic". :)
Just for some perspective, if you are really taking up 25% of your link
bandwidth on a consistent basis for hellos, keepalives, routing updates and
things like that, you have some design problems.
The intent of the 25% was certainly to include those, but was geared mostly
to make sure that people didn't starve out the rest of the traffic! Routing
updates are marked internally (with IP Prec 6, but also with a
"pak_priority" information to indicate the importance of the traffic. If
not matched by a queue, these (like anything else unclassified) are placed
into the class class-default. Which gets 25% of a link's bandwidth.
If you have special needs for your routing and such, Cisco recommends that
you create a queue specifically for it. Layer 2 keepalives and such
generally occur outside this queuing mechanism and aren't anything to worry
about.
FYI:
http://www.cisco.com/en/US/tech/tk543/tk544/technologies_tech_note09186a0080
094612.shtml
Cheers,
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Daniel Paes
Sent: Friday, April 22, 2005 12:02 PM
To: Scott Morris; 'mani poopal'; 'John Matus'; ccielab@groupstudy.com
Subject: Re: precedence int cbwfq
Hi,
Just for clarification, the 25% is not the amount for the unclassified. It's
the reserved part for hellos, keepalives, routing updates, Integated
Services signaling and other specific traffic from the routers inner
processes. And the 25% reserve for that can be used by other traffic as long
as the legitime owners (the stated processes) don't use them.
The class default doesn't have any guaranteed bandwidth at all by default,
unless you use the "bandwidth percent %" or "bandwidth Kbps" in the default
class configuration Just follow my previous post.
Regards
Daniel
----- Original Message -----
From: "Scott Morris" <swm@emanon.com>
To: "'mani poopal'" <mani_ccie@yahoo.com>; "'John Matus'"
<john_matus@hotmail.com>; <ccielab@groupstudy.com>
Sent: Friday, April 22, 2005 4:13 PM
Subject: RE: precedence int cbwfq
> 1. Yes, by default you can reserve up to 75% of a link's bandwidth
> 2. That 25% is set aside for 'otherwise unclassified' (aka class
> class-default) traffic
> 3. Yes, anything not otherwise guaranteed. The default class gets the
> leftovers. If you change the max reserved bandwidth you are sort of
> reducing the amount that the default class will get. I do know that some
> people will set max-reserve to 100 and then make sure they set aside
> bandwidth for the default class in their policy.
>
> That's a personal choice, but IOS tries to make sure that you don't hose
> yourself TOO badly. :)
>
> Scott
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
mani
> poopal
> Sent: Friday, April 22, 2005 8:36 AM
> To: Scott Morris; 'John Matus'; ccielab@groupstudy.com
> Subject: RE: precedence int cbwfq
>
> Hi Scott and GS member;
>
> I have a small(but important) doubt in MQC. Even after studying MQC a lot,
> (1.)What is the default bandwidth for MQC is it 75% of interface
bandwidth.
> (2.)Say the interface bandwidth is 100MB,is it only 75 MB available for
MQC,
> In that case is there is any default bandwidth allocated for class
default.
> (3.)Is there is any default bandwidht for class class-default and is it
> 75MB(assuming no classes are defined), If any classes are defined, what
is
> the bandwidith for class class-default (4.)the command
> -if)#max-reserve-bandwidth 90, the purpose, is it increases the bandwidth
> available for MQC or bandwidth available for class class-default
>
> thanks
>
> Mani
>
> Scott Morris <swm@emanon.com> wrote:
> Don't forget that "?" is your friend.
>
> Emanon-R1(config)#policy-map Set-This
> Emanon-R1(config-pmap)#class Who-Knows
> Emanon-R1(config-pmap-c)#?
> QoS policy-map class configuration commands:
> bandwidth Bandwidth
> compression Activate Compression
> drop Drop all packets
> exit Exit from QoS class action configuration mode no Negate or set
default
> values of a command police Police priority Strict Scheduling Priority for
> this Class queue-limit Queue Max Threshold for Tail Drop random-detect
> Enable Random Early Detection as drop policy service-policy Configure QoS
> Service Policy set Set QoS values shape Traffic Shaping
>
>
> Emanon-R1(config-pmap-c)#set ?
> atm-clp Set ATM CLP bit to 1
> cos Set IEEE 802.1Q/ISL class of service/user priority
> discard-class Discard behavior identifier
> dscp Set DSCP in IP(v4) and IPv6 packets
> fr-de Set FR DE bit to 1
> ip Set IP specific values
> mpls Set MPLS specific values
> precedence Set precedence in IP(v4) and IPv6 packets
> qos-group Set QoS Group
>
> Emanon-R1(config-pmap-c)#
> -----Total Telnet Time 8.54 seconds-----
>
> Scott
> ;)
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
John
> Matus
> Sent: Thursday, April 21, 2005 6:26 PM
> To: ccielab@groupstudy.com
> Subject: precedence int cbwfq
>
> is there a way to mark precedence in cbwfq?
>
> _________________________________________________________________
> Express yourself instantly with MSN Messenger! Download today - it's FREE!
> http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
> B.ENG,A+,CCNA,CCNP,CCNP-VOICE, CSS1,CNA,MCSE
> (416)431 9929
> MANI_CCIE@YAHOO.COM
> __________________________________________________
> Do You Yahoo!?
> Tired of spam? Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Tue May 03 2005 - 07:55:07 GMT-3