Re: cos rewriting on switch

Thanks, that answers my questions !

On 10 November 2010 12:40, Narbik Kocharians <narbikk_at_gmail.com> wrote:

>
>
>
>
> * *
>
> * May be this will help:*
>
> **
>
> *` TOS Byte **_*
>
>
>
> *IPP*
>
> *IPP*
>
> *IPP*
>
> *D*
>
> *T*
>
> *R*
>
> *ECN*
>
> *ECN*
>
> *Decimal*
>
> *IPP Level*
>
> *TOS Levels*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *0  31*
>
> *0*
>
> *0*
>
> *1*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *32*
>
> *1*
>
> *32  63*
>
> *0*
>
> *1*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *64*
>
> *2*
>
> *64  95*
>
> *0*
>
> *1*
>
> *1*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *96*
>
> *3*
>
> *96  127*
>
> *1*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *128*
>
> *4*
>
> *128  159*
>
> *1*
>
> *0*
>
> *1*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *160*
>
> *5*
>
> *160  191*
>
> *1*
>
> *1*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *192*
>
> *6*
>
> *192  223*
>
> *1*
>
> *1*
>
> *1*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *0*
>
> *224*
>
> *7*
>
> *224 - 255*
>
> * *
>
>
> On Wed, Nov 10, 2010 at 9:04 AM, Jack Router <pan.router_at_gmail.com> wrote:
>
>> Thanks Mark. You pointed me to the right direction to undestand this.
>>
>> Just a question: why you used value "101111000" for the ping test? All
>> that
>> counts are first three bits 101, decimal 5. The rest of the TOS byte can
>> be
>> anything. I just did extended ping from R2 with Type of service 160, 170
>> and
>> 191 (all tose numbers begin 101 in binary) and it is received on R1 as
>> cos5,
>> as expected. Does it make sense ?
>>
>>
>> On 10 November 2010 10:50, <mwcombs_at_comcast.net> wrote:
>>
>> > Jack,
>> >
>> >
>> >
>> > I specified in my previous email that you have to mark your service
>> class
>> > 184 on your ping tests. I meant TOS (type of service) not to be
>> confused
>> > with dscp values.
>> >
>> >
>> >
>> > TOS values:
>> >
>> > binary 101110, the full TOS value is 101111000 which is decimal 184, or
>> in
>> > hex 0xB8.
>> >
>> > - Mark
>> >
>> > ----- Original Message -----
>> > From: mwcombs_at_comcast.net
>> > To: "Jack Router" <pan.router_at_gmail.com>
>> > Cc: ccielab_at_groupstudy.com
>> > Sent: Wednesday, November 10, 2010 9:30:45 AM
>> > Subject: Re: cos rewriting on switch
>> >
>> > Jack,
>> >
>> >
>> >
>> > Your traffic leaving R2 must mark it's traffic with cos5 or 0x2e in hex
>> > which
>> > equates to an precedence 5.B Is your router2 even marking your traffic
>> > properly?B I would setup a monitoring port on port 2 which connects to
>> > router
>> > 2 to validate the packets coming in are indeed marked properly.B My
>> guess
>> >
>> > they are not.
>> >
>> >
>> >
>> > Another thought is why are you trying to look for a greated cos value
>> then
>> > 0
>> > on an ICMP packet?B When you do your pings are you using extended
>> options
>> > commands and specifing service class 184?B You will need to do this if
>> you
>> > want to mark your packet with cos vaule of 5.B If not your pings will
>> just
>> > be
>> >
>> > normal pings.
>> >
>> >
>> >
>> > - Mark Combs
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> > ----- Original Message -----
>> > From: "Jack Router" <pan.router_at_gmail.com>
>> > To: ccielab_at_groupstudy.com
>> > Sent: Tuesday, November 9, 2010 10:31:18 PM
>> > Subject: cos rewriting on switch
>> >
>> > Hello all,
>> >
>> > I have a question about cos rewriting on a switch. Here is scenario:
>> >
>> > R1(f0/0.100)-----dot1q------(f0/1)SW1(f0/2)------access-------(f0/0)R2
>> >
>> > On R1 I configured class maps and policy map to identify what cos is
>> > received.
>> > SW1 has NO mls qos enabled or any cos configuration.
>> >
>> > When I ping R1 from R2 i see that R1 receives packets marked with cos0.
>> Why
>> > ? Packets that leave R2 are not tagged with cos value, why then R1
>> receives
>> > packets cos0 ?
>> > Is cos0 a synonym of no cos marking ?
>> >
>> >
>> > Blogs and organic groups at http://www.ccie.net
>> >
>> > _______________________________________________________________________
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>> >
>> >
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>> >
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>>
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>>
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>>
>>
>>
>>
>>
>>
>>
>>
>
>
> --
> *Narbik Kocharians
> *CCSI#30832, CCIE# 12410 (R&S, SP, Security)
> www.MicronicsTraining.com <http://www.micronicstraining.com/>
> Sr. Technical Instructor
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Received on Thu Nov 11 2010 - 10:46:40 ART