Re: ICMP Query!!!

Of course, based on the assumption that Cisco documentation is never
wrong, a very wise choice.

--
Marko Milivojevic - CCIE #18427
Senior Technical Instructor - IPexpert
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On Sun, Nov 14, 2010 at 02:13, ron wilkerson <ron.wilkerson_at_gmail.com> wrote:
> that's fine..
> i'll stick to what the cisco doc states and others can stick to what they
> believe is correct...agree to disagree.
>
> another item to be added to the list where everyone won't agree due to
> various reasons.
>
>
>
> On Sat, Nov 13, 2010 at 7:10 PM, Tyson Scott
> <tyson.scott_at_advtechracks.com>wrote:
>
>> As I said ICMP unreachables will go to the CEF exception sub interface
>>
>> Regards,
>>
>> Tyson Scott
>> CCIE # 13513 (R&S, Security, SP)
>>
>> Managing Partner/Technical Instructor - IPexpert Inc.
>> tscott_at_ipexpert.com
>>
>>
>> ----- Reply message -----
>> From: "ron wilkerson" <ron.wilkerson_at_gmail.com>
>> Date: Sat, Nov 13, 2010 3:30 pm
>>
>> Subject: ICMP Query!!!
>> To: "Tyson Scott" <tyson.scott_at_advtechracks.com>
>> Cc: "negron.paul_at_gmail.com" <negron.paul_at_gmail.com>, "tron_at_huapi.ba.ar" <
>> tron_at_huapi.ba.ar>, "eliteccie_at_gmail.com" <eliteccie_at_gmail.com>, "
>> ccielab_at_groupstudy.com" <ccielab_at_groupstudy.com>
>>
>>
>> http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6642/prod_white_paper0900aecd805ffde8.html
>>
>> read the 4th paragraph.
>>
>> On Sat, Nov 13, 2010 at 3:24 PM, Tyson Scott <tyson.scott_at_advtechracks.com
>> > wrote:
>>
>>> ICMP is not control plane traffic. B ICMP unreachables go to the CEF
>>> exception for example. B Consider the control plane as protocols that
>>> glue the network together. B ICMP traffic to the router go to the host
>>> control plane because of being directed to the device thus it must
>>> handle it. B ICMP is data traffic that may be used for management
>>> purposes
>>>
>>> Regards,
>>>
>>> Tyson Scott
>>> CCIE # 13513 (R&amp;S, Security, SP)
>>> Managing Partner/Technical Instructor - IPexpert Inc.
>>> tscott_at_ipexpert.com
>>>
>>>
>>> ----- Reply message -----
>>> From: "Paul Negron" <negron.paul_at_gmail.com>
>>> Date: Sat, Nov 13, 2010 2:10 pm
>>> Subject: ICMP Query!!!
>>> To: "ron.wilkerson_at_gmail.com" <ron.wilkerson_at_gmail.com>, "Carlos G
>>> Mendioroz" <tron_at_huapi.ba.ar>
>>> Cc: "CCIE KID" <eliteccie_at_gmail.com>, "Cisco certification"
>>> <ccielab_at_groupstudy.com>
>>>
>>>
>>> Very Interesting Response.
>>>
>>> I guess I primarily viewed ICMP as testing the Control Plane/ Data Plane
>>> with the Majority of ICMP Query types:
>>>
>>> * 0 = Echo Reply (3ping response2)
>>> * 8 = Echo Request (3ping query2)
>>> * 9 = Router Advertisement (RFC 1256)
>>> * 10 = Router Solicitation (RFC 1256)
>>> * 13 = Time Stamp Request
>>> * 14 = Time Stamp Reply
>>> * 17 = Address Mask Request
>>> * 18 = Address Mask Reply
>>>
>>> I know my definition is a little Narrow but it does help differentiate
>>> ICMP
>>> from protocols like RSVP, PIM, EIGRP that strictly represent Control Plane
>>> from a Routing Switching perspective.
>>>
>>> As far as the view that because ICMP uses the CPU being a CLEAR
>>> definition,
>>> this I would disagree with. What would Process Switching be then? Control
>>> Plane or Data Plane activity?
>>>
>>> Carlos and Ron do make a good point to expand my Narrow definition though.
>>> :-)
>>>
>>> Paul
>>>
>>>
>>> --
>>> Paul Negron
>>> CCIE# 14856 CCSI# 22752
>>> Senior Technical Instructor
>>> www.micronicstraining.com
>>>
>>>
>>>
>>> > From: <ron.wilkerson_at_gmail.com>
>>> > Reply-To: <ron.wilkerson_at_gmail.com>
>>> > Date: Fri, 12 Nov 2010 23:58:17 +0000
>>> > To: Paul Negron <negron.paul_at_gmail.com>, Carlos G Mendioroz <
>>> tron_at_huapi.ba.ar>
>>>
>>> > Cc: CCIE KID <eliteccie_at_gmail.com>, Cisco certification
>>> > <ccielab_at_groupstudy.com>
>>> > Subject: Re: ICMP Query!!!
>>> >
>>> > Agree with carlos...
>>> > I've always thought of control plane as anything that the cpu has to
>>> look at.
>>> > Some icmp packets require the cpu, so I'd classify those icmp as control
>>> plane
>>> > packets.
>>> >
>>> >
>>> > Sent from my Verizon Wireless BlackBerry
>>> >
>>> > -----Original Message-----
>>> > From: Paul Negron <negron.paul_at_gmail.com>
>>> > Sender: nobody_at_groupstudy.com
>>> > Date: Fri, 12 Nov 2010 16:39:10
>>> > To: Carlos G Mendioroz<tron_at_huapi.ba.ar>
>>> > Reply-To: Paul Negron <negron.paul_at_gmail.com>
>>> > Cc: CCIE KID<eliteccie_at_gmail.com>; Cisco certification<
>>> ccielab_at_groupstudy.com>
>>> > Subject: Re: ICMP Query!!!
>>> >
>>> > It is true that they help convey information or make sure a path is
>>> clear to
>>> > send larger packets, but ICMP is not intended to help create state
>>> within
>>> > the control plane.
>>> >
>>> > Like I said....
>>> >
>>> >
>>> > IGMP helps to create a path in which Traffic will use.
>>> > ICMP uses the data plane that a control plane protocol created.
>>> >
>>> > Does anyone else have anything useful to contribute?
>>> >
>>> > I would always love to hear another explanantion that can be useful and
>>> I'm
>>> > sure CCIE KID would too, unless the "KID" already gets it.
>>> >
>>> >
>>> > Narbik?
>>> >
>>> >
>>> > --
>>> > Paul Negron
>>> > CCIE# 14856 CCSI# 22752
>>> > Senior Technical Instructor
>>> > www.micronicstraining.com
>>> >
>>> >
>>> >
>>> >> From: Carlos G Mendioroz <tron_at_huapi.ba.ar>
>>> >> Date: Fri, 12 Nov 2010 17:39:56 -0300
>>> >> To: Paul Negron <negron.paul_at_gmail.com>
>>>
>>> >> Cc: CCIE KID <eliteccie_at_gmail.com>, Cisco certification
>>> >> <ccielab_at_groupstudy.com>
>>> >> Subject: Re: ICMP Query!!!
>>> >>
>>> >> I would call ICMP redirect packets a control thing though.
>>> >> And when using ICMP probes (echo request/reply) as part of a IP SLA
>>> >> construct, they are a control thing too.
>>> >> What about packet too big ?
>>> >>
>>> >> In fact, Internet Control Message Protocol sounds a lot to control :)
>>> >>
>>> >> -Carlos
>>> >>
>>> >> Paul Negron @ 10/11/2010 14:21 -0300 dixit:
>>> >>> I apologize, B I meant to state:
>>> >>>
>>> >>>> IGMP packets are used to create state on the Router that receives
>>> them.
>>> >>>> Since it is used to create state, it is a part of the Control Plane
>>> >>>> process.
>>> >>>> It joins so that trees can be built, Although it is PIM that builds
>>> them.
>>> >>>>
>>> >>>> ICMP is generating traffic and is not associated with building
>>> ANYTHING. It
>>> >>>> is considered Data Plane traffic. It uses paths that have already
>>> been
>>> >>>> setup
>>> >>>> by a Control Plane Protocol, like OSPF or EIGRP or PIM for that
>>> matter.
>>> >>>
>>> >>> I accidentally stated ICMP twice.
>>> >>>
>>> >>> Paul
>>> >>
>>> >> --
>>> >> Carlos G Mendioroz B <tron_at_huapi.ba.ar> B LW7 EQI B Argentina
>>> >
>>> >
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>>
>>
>>
>> --
>> stop talking
>>
>
>
>
> --
> stop talking
>
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