[PSAMP] configuration of hash function in PSAMP

["DUFFIELD, NICHOLAS G (NICK)" <duffield at research.att.com>]

Benoit and I started a discussion on how hash function parameters are to be specified in the IPFIX/PSAMP configuration draft, which Juergen suggested we move to the mailing list.

-------


Benoit,

Thanks.

More generally, I think the mapping between SELECTOR_PARAMETERS items in PSAMP-tech, and the corresponding elements in the configuration model, should be unambiguously recorded in the standard.

Possible options: (i) uniformize the names across both drafts, or (ii) have comments in the configuration document that make it clear which item from psamp-tech is referred to.

Nick



> -----Original Message-----
> From: Benoit Claise [mailto:bclaise at cisco.com]
> Sent: Thursday, November 20, 2008 5:23 PM
> To: DUFFIELD, NICHOLAS G (NICK)
> Cc: 'Juergen Quittek'; Zseby, Tanja; Gerhard Muenz; Benoit Claise
> Subject: Re: configuration of hash function in PSAMP
>
> Nick,
>
> > Actually this may well be is OK as is: the initvalues for hash functions
> are specified in PSAMP-tech (32bit number when used), and the config draft
> appears include all the items needed to specify
> >
> > mask for hash input
> > (headerBits, payloadBytes, payloadBits)
> >
> > initvalues
> > Benoit: is this inputBits? Please confirm.
> >
> These inputBits come from "Input bits" in PSAMP-TECH.
> Please post this to the mailing list so that everybody is aware.
>
> Regards, Benoit.
> >
> > draft-ietf-ipfix-configuration-model-01.txt:
> > container filterHash {
> >           description "In PSAMP-MIB, function and funcParam are OIDs.";
> >           leaf addrType { type inet:ip-version; }
> >           leaf headerBits { type string; }
> >           leaf payloadBytes { type uint32; }
> >           leaf payloadBits { type string; }
> >           leaf function { type string; }
> >           leaf funcParam { type string; }
> >           leaf inputBits { type uint32; }
> >           leaf outputBits { type uint32; }
> >           leaf outputMask { type string; }
> >           leaf selection { type string; }
> >         }
> >
> > draft-ietf-psamp-sample-tech-11.txt:
> > Case Hashing:
> >        - Hash Domain (Input bits from packet)
> >             - <Header type = IPv4>
> >             - <Input bit specification, header part>
> >             - <Header type =  IPv6>
> >             - <Input bit specification, header part>
> >             - <payload byte number N>
> >             - <Input bit specification, payload part>
> >        - Hash Function
> >             - Hash function name
> >             - Length of input key (eliminate 0x bytes)
> >             - Output value (length M and bitmask)
> >             - Hash Selection Range, as a list of non overlapping
> >               intervals [start value, end value] where value is in
> >               [0,2^M-1]
> >             - Additional parameters dependent on specific Hash
> >               Function (e.g. hash input bits (seed))
> >
> >
> >

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