From: Arun Arumuganainar (aarumuga@hotmail.com)
Date: Wed Aug 31 2005 - 22:12:02 GMT-3
Default Maximum reservable bandwidth is 75% . However you can change it via
CLI "max reserved bandwidth " to assign more than 75% of the available
bandwidth .
So if you are not sure of what is the reservable bandwidth ??? Then you can
also use Bandwidth remaining percentage !!! But pls. use it with caution as
this will not give you fixed guarantee . It will give guarantees based on
available bandwidth when the command is applied.
Thanks and Regards
Arun
----- Original Message -----
From: "simon hart" <simon@harttel.com>
To: "Chris Lewis (chrlewis)" <chrlewis@cisco.com>; "simon hart"
<simon@harttel.com>; "ccie2be" <ccie2be@nyc.rr.com>; "Group Study"
<ccielab@groupstudy.com>
Sent: Thursday, September 01, 2005 12:53 AM
Subject: RE: absolute or percentage - will it cost points?
> Hi Chris,
>
> Thanks for the input. I am glad you have pointed this out, as it has
> certainly corrected my understanding of the two commands.
>
> I configured along the same lines as yourself, however I created 3
classes
> under one policy. Each class is given percent 25. The show policy
interface
> certainly shows that 2500 has been allocated as the guaranteed bandwidth.
> If I try and add another class with percent 25 I recieve an error message:
>
> Rack1R5(config-pmap)#class ICMP
> Rack1R5(config-pmap-c)#band
> Rack1R5(config-pmap-c)#bandwidth percent 25
> I/f Ethernet0/0 class ICMP requested bandwidth 25%, available only 0%
>
> From this I take the following assumption. Bandwidth 25% takes 25% of
total
> bandwidth = 2500. However one can never assign more than 75%, i.e. more
> than three bandwidth percent 25 commands (or whatever config that adds up
to
> 75).
>
> Thus bandwidth 2500 and bandwidth percent 25 amount to the same thing if
> the total interface bandwidth is 1000. I believe the reason for the
> introduction of the bandwidth percent command is the transportability of a
> configuration amongst different interfaces, and for interfaces where the
> bandwidth may vary.
>
> Thanks Chris
>
> Simon
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Chris
> Lewis (chrlewis)
> Sent: 31 August 2005 18:53
> To: simon hart; ccie2be; Group Study
> Subject: RE: absolute or percentage - will it cost points?
>
>
> Hello Simon,
>
> I read your reply and it made sense to me, however I tried it out on a
> router and the results do not seem to agree.
>
> In the configuration below, I create an arbitrary class (OK I wouldn't
> use bandwidth for voice traffic in a real deployment, but that's not
> important here) just to see the effects of the bandwidth and bandwidth
> percent, then use show policy-map interface to check what the router is
> doing.
>
> From this output it appears that the two commands do in fact give an
> equivalent result in terms of claiming 2500kbps is reserved for the
> class defined.
>
> How to reconcile the two views?
>
> Router1(config)#class-map voice
> Router1(config-cmap)#match ip rtp 16383 16383
> Router1(config-cmap)#exit
> Router1(config)#policy-map pm1
> Router1(config-pmap)#class voice
> Router1(config-pmap-c)#bandwidth percent 25
> Router1(config-pmap-c)#int e0/0
> Router1(config-if)#service-pol out pm1
> Router1(config-if)#do sho policy int
> Ethernet0/0
>
> Service-policy output: pm1
>
> Class-map: voice (match-all)
> 0 packets, 0 bytes
> 5 minute offered rate 0 bps, drop rate 0 bps
> Match: ip rtp 16383 16383
> Queueing
> Output Queue: Conversation 265
> Bandwidth 25 (%)
> Bandwidth 2500 (kbps) Max Threshold 64 (packets)
> (pkts matched/bytes matched) 0/0
> (depth/total drops/no-buffer drops) 0/0/0
>
> Class-map: class-default (match-any)
> 1 packets, 60 bytes
> 5 minute offered rate 0 bps, drop rate 0 bps
> Match: any
> Router1(config-if)#no service-pol out pm1
> Router1(config-if)#no policy-map pm1
> Router1(config)#policy-map pm2
> Router1(config-pmap)#class voice
> Router1(config-pmap-c)#bandwidth 2500
> Router1(config-pmap-c)#exit
> Router1(config-pmap)#int e0/0
> Router1(config-if)#service-pol out pm2
> Router1(config-if)#do sho policy-map int
> Ethernet0/0
>
> Service-policy output: pm2
>
> Class-map: voice (match-all)
> 0 packets, 0 bytes
> 5 minute offered rate 0 bps, drop rate 0 bps
> Match: ip rtp 16383 16383
> Queueing
> Output Queue: Conversation 265
> Bandwidth 2500 (kbps) Max Threshold 64 (packets)
> (pkts matched/bytes matched) 0/0
> (depth/total drops/no-buffer drops) 0/0/0
>
> Class-map: class-default (match-any)
> 0 packets, 0 bytes
> 5 minute offered rate 0 bps, drop rate 0 bps
> Match: any
>
> Config of router this was run on (no max reserved bandwidth configured).
>
> policy-map pm2
> class voice
> bandwidth 2500
> !
> !
> !
> interface Loopback0
> ip address 192.168.1.1 255.255.255.0
> !
> interface Ethernet0/0
> ip address 172.16.136.1 255.255.255.192
> service-policy output pm2
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> simon hart
> Sent: Tuesday, August 30, 2005 2:06 PM
> To: ccie2be; Group Study
> Subject: RE: absolute or percentage - will it cost points?
>
> Hey Tim,
>
> Getting into the swing of things again.
>
> Your question below will depend on other factors, however looking
> straight off they are not the same.
>
> When applying a policy to an ethernet interface the IOS will default the
> available bandwidth to the 75% of the actual interface bandwidth.
> Therefore
>
> Bandwidth 2500 does not equate to 25% of the bandwidth but will equate
> to
> (2500/7500) * 100 = 33.33%
>
> Whereas applying Bandwidth percent 25 will equate to 25% of 75% of
> available interface bandwidth = 1875
>
> Now if you were to apply the following command to interface e0
>
> max-reserved-bandwidth 100
>
> Then both bandwidth 2500 and bandwidth percent 25% would be equivalent
>
> In the exam I would err on the side of caution and use the bandwidth
> percent 25. Also for good measure would probably ask the proctor for
> clarity.
>
> Simon
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> ccie2be
> Sent: 29 August 2005 20:06
> To: Group Study
> Subject: absolute or percentage - will it cost points?
>
>
> Hi guys,
>
> Here's another interpretation question.
>
> If told to reserve 25% of the bandwidth on a ethernet interface for a
> certain type of traffic, will both of the below config's score points?
>
> policy-map
> class xxx
> bandwidth percent 25
>
>
> policy-map
> class xxx
> bandwidth 2500
>
>
> From a network point of view, they both accomplish the same exact thing,
> but from a lab scoring point of view, are they both equal?
>
> TIA, Tim
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
> --
> No virus found in this incoming message.
> Checked by AVG Anti-Virus.
> Version: 7.0.344 / Virus Database: 267.10.16/83 - Release Date:
> 26/08/2005
>
> --
> No virus found in this outgoing message.
> Checked by AVG Anti-Virus.
> Version: 7.0.344 / Virus Database: 267.10.17/84 - Release Date:
> 29/08/2005
>
> _______________________________________________________________________
> 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
> --
> No virus found in this incoming message.
> Checked by AVG Anti-Virus.
> Version: 7.0.344 / Virus Database: 267.10.17/85 - Release Date: 30/08/2005
>
> --
> No virus found in this outgoing message.
> Checked by AVG Anti-Virus.
> Version: 7.0.344 / Virus Database: 267.10.17/85 - Release Date: 30/08/2005
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Sun Sep 04 2005 - 17:01:20 GMT-3