[Forces-protocol] Re: Meaning of PACKET *SUBSCRIBE operation type unclear

Robert Haas <rha@zurich.ibm.com> Mon, 25 October 2004 23:54 UTC

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Date: Mon, 25 Oct 2004 23:11:27 +0200
From: Robert Haas <rha@zurich.ibm.com>
Organization: IBM Research Lab
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To: "Khosravi, Hormuzd M" <hormuzd.m.khosravi@intel.com>
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Cc: ram.gopal@nokia.com, "Wang, Weiming" <wmwang@mail.hzic.edu.cn>, forces-protocol@ietf.org, avri@psg.com, Jamal Hadi Salim <hadi@znyx.com>, Ligang Dong <donglg@mail.hzic.edu.cn>
Subject: [Forces-protocol] Re: Meaning of PACKET *SUBSCRIBE operation type unclear
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Hormuzd,

Khosravi, Hormuzd M wrote:

>Robert,
>
>I tried to explain this in my response to Jamal, not sure if you saw
>that ? 
>
>This has been added to support the Requirements RFC section6 #9...
>
> 9) Packet Redirection/Mirroring
>      a) The ForCES protocol MUST define a way to redirect packets from
>         the FE to the CE and vice-versa.  Packet redirection terminates
>         any further processing of the redirected packet at the FE.
>      b) The ForCES protocol MUST define a way to mirror packets from
>         the FE to the CE.  Mirroring allows the packet duplicated by
>         the FE at the mirroring point to be sent to the CE while the
>         original packet continues to be processed by the FE.
>
>   Examples of packets that may be redirected or mirrored include
>   control packets (such as RIP, OSPF messages) addressed to the
>   interfaces or any other relevant packets (such as those with Router
>   Alert Option set).  The ForCES protocol MUST also define a way for
>   the CE to configure the behavior of a) and b) (above), to specify
>   which packets are affected by each.
>
>
>If there is a cleaner/faster way to do this, pls propose and I am happy
>to discuss.
>But lets not make changes to the draft before discussing these issues.
>
>Regards
>Hormuzd
>
>P.s. I first had this as part of Event Type, but based on your comments
>I made this change, I thought this was cleaner...
>  
>
My current thinking is that any LFB that generates PKT_REDIR messages 
will provide attributes that can be configured to decide which packets 
must be redirected or mirrored. A CONFIG msg to the appropriate 
attribute(s) should suffice, no ?

Regards,
-Robert

>-----Original Message-----
>From: Robert Haas [mailto:rha@zurich.ibm.com] 
>
>Hormuzd,
>Could you please explain again the use of PACKET *SUBSCRIBE in the 
>Config msg ?
>Can we use another existing operation type and/or LFB for this ?
>
>Thanks,
>
>
>
>  
>

-- 
Robert Haas
IBM Zurich Research Laboratory
Säumerstrasse 4
CH-8803 Rüschlikon/Switzerland
phone +41-1-724-8698  fax +41-1-724-8578  http://www.zurich.ibm.com/~rha


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