Re: [Idr] Review of draft-ietf-large-community-06.txt

"Jakob Heitz (jheitz)" <jheitz@cisco.com> Sun, 06 November 2016 06:26 UTC

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From: "Jakob Heitz (jheitz)" <jheitz@cisco.com>
To: Zhuangshunwan <zhuangshunwan@huawei.com>
Thread-Topic: [Idr] Review of draft-ietf-large-community-06.txt
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Date: Sun, 6 Nov 2016 06:26:53 +0000
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Subject: Re: [Idr] Review of draft-ietf-large-community-06.txt
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Shunwan,

On Nov 5, 2016, at 3:35 AM, Job Snijders <job@instituut.net<mailto:job@instituut.net>> wrote:

On Sat, Nov 05, 2016 at 10:28:58AM +0000, Zhuangshunwan wrote:

Some customers from IDC/OTT complain that ISPs can not transmit their
community attributes, because ISPs do not transmit community
attributes in most cases.

I find it hard to make or accept quantative statements in this context,
I know some ISP that scrub all communities, and I know some ISPs that
pass on as much communities as possible. The market will decide.

Another reason is that some ISPs use private ASNs rather than their own ASN in the first 16 bits of the community, because there is not enough leftover bits to express the action. That makes it impossible for an ISP to transmit them to another ISP, because of name space clashes. That should no longer be a problem with large communities.
See https://onestep.net/communities<https://onestep.net/communities/>/ for examples of communities. BTW, I don't recognize any Chinese ISPs on that site. Can you share some community specifications for any Chinese ISPs, please?

谢谢,
Jakob.