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

李振强 <13911635816@139.com> Thu, 16 February 2017 12:02 UTC

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Subject: Re: [IPFIX] [GROW] [OPSAWG] WG adoption poll fordraft-li-opsawg-ipfix-bgp-community-02
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Thank you P.J. Aitken.

The length of IPFIX message is sufficient for BGP standard communities, since the length of standard community is 4 octets. But the sizes of extended community, large community and wide community are bigger than the size of standard community. If the working group agrees to cover the above all kinds of communities in this draft, do you think we should open the discussion for IPFIX and basicList message splitting?

Sorry for the duplicate mails.

Best Regards
Zhenqiang Li



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在2017-02-16 19:59:59
李振强<13911635816@139.com>写道:


发件人:PJ Aitken<pjaitken@brocade.com>;
日期:2017-02-16 19:16:00
收件人:lizhenqiang@chinamobile.com<lizhenqiang@chinamobile.com>, grow-bounces<grow-bounces@ietf.org>;, zhoutianran<zhoutianran@huawei.com>;
主题:Re: [IPFIX] [GROW] [OPSAWG] WG adoption poll fordraft-li-opsawg-ipfix-bgp-community-02


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 value16376= x      |   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+





P.



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