Re: ICMP Query!!!

As Marko said, moot point:
  An issue that is subject to, or open for discussion or debate;
  originally, one to be definitively determined by an assembly of the
  people.

May be the issue is the lack of a concrete definition of what is a
data plane protocol. We all know what data plane is, control plane too.
But what is a control plane protocol ? And even more confusing,
what would a data plane protocol be ?

How one router treats the traffic seems not to be a good tie breaker,
cause e.g. a multihop BGP session passes through an intermediate router
as data, and that will not make BGP a data plane protocol, would it ?

So I like the view that if a router has to pay attention, it is control
plane. Attention to the packet content that is. So that rules
out the process switching argument.
The name means a lot too, to me at least.

In any case, I don't really see a point in defining a protocol as
data plane protocol. If anyone can come up with a good definition
of that, then we can resume the discussion of ICMP being one such animal
or not...

-Carlos

Tyson Scott @ 13/11/2010 17:24 -0300 dixit:
> ICMP is not control plane traffic. ICMP unreachables go to the CEF
> exception for example. Consider the control plane as protocols that
> glue the network together. ICMP traffic to the router go to the host
> control plane because of being directed to the device thus it must
> handle it. ICMP is data traffic that may be used for management
> purposes
>
> Regards,
>
> Tyson Scott
> CCIE # 13513 (R&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
>
>

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net