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Re: [IPFIX] [GROW] [OPSAWG] WG adoption poll for draft-li-opsawg-ipfix-bgp-community-02

PJ Aitken <pjaitken@brocade.com> Thu, 16 February 2017 11:15 UTC

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From: PJ Aitken <pjaitken@brocade.com>
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Date: Thu, 16 Feb 2017 11:15:24 +0000
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Subject: Re: [IPFIX] [GROW] [OPSAWG] WG adoption poll for draft-li-opsawg-ipfix-bgp-community-02
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Ignas Bagdonas wrote:


 > The upper limit may be reaching 16000 standard communities per prefix 
- would that fit into resulting IPFIX IE? If there is a limit, how does 
it work?


A quick calculation suggests that the maximum would be 16376 x 4-octet 
ASNs. See the figure below.

The constraining factor is the RFC7011 IPFIX Message Header "Length" 
field, since this is only 16 bits.

Splitting a list across multiple IPFIX messagesis a question which the 
IPFIX community hasn't discussed.Unfortunately the basicList "Semantic" 
field only defines the relationship among the different values within a 
single message; the relationship among values in different messages is 
not defined.

IPFIX Collectors might reasonably assume that information in subsequent 
messages supersedes information in earlier messages, so splitting a list 
across multiple messages would not have the desired effect.


      0                   1                   2                   3      
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1     
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+     
|       Version Number          |        Length = 65532         |     
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+     
|                           Export Time                         |     
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+     
|                       Sequence Number                         |     
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+     
|                    Observation Domain ID                      |     
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+     
|          Set ID = 256         |         Length = 65516        |     
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+     
|      255      |      List Length = 65509      | semantic=allOf|     
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+     | 
      bSCL FieldId = 459       |      bSCL Field Length=4      |     
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+     | 
              bgpSourceCommunityList value 1 = x               |     
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+     | 
              bgpSourceCommunityList value 2 = x               |     
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+      
                               ...     
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+     | 
              bgpSourceCommunityList value 16376 = x           |     
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


P.

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