Re: ICMP Query!!!

I concur with Sadiq's assessment.

In terms of the way ICMP traffic is classified (control vs data) from
the perspective of a router, it depends entirely on whether it is
destined for that router or simply being passed through it.

I can't think of a ICMP packet type that triggers a response by an
intermediate/transit system, aside from oddball things like IDS/IPS.
Can anyone else? By design, It's all about signalling to/from
endpoints.

And the PAK priority thing doesn't hold water either as last time I
checked (12.4(15)T), IKE traffic - very much a control plane protocol
when a SA is terminated on the local router - wasn't given any special
treatment (no PAK priority, no DSCP marking).

Happy to stand corrected.

Cheers
Dale
(apologies for top-post and lack of quoting and trimming)

On Monday, November 15, 2010, Marko Milivojevic <markom_at_ipexpert.com> wrote:
> Of course, based on the assumption that Cisco documentation is never
> wrong, a very wise choice.
>
> --
> Marko Milivojevic - CCIE #18427
> Senior Technical Instructor - IPexpert
>
> FREE CCIE training: http://bit.ly/vLecture
>
> Mailto: markom_at_ipexpert.com
> Telephone: +1.810.326.1444
> Web: http://www.ipexpert.com/
>
> 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<>>> >>> 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
>>>> >
>>>> >
>>>> > Blogs and organic groups at http://www.ccie.net
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>>>
>>>
>>>
>>> --
>>> stop talking
>>>
>>
>>
>>
>> --
>> stop talking
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> _______________________________________________________________________
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>
>
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Received on Mon Nov 15 2010 - 03:09:22 ART