Re: [Idr] [GROW] Deprecation of AS_SET and AS_CONFED_SET -- feedback requested

Jared Mauch <jared@puck.nether.net> Thu, 26 September 2019 15:01 UTC

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From: Jared Mauch <jared@puck.nether.net>
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Date: Thu, 26 Sep 2019 11:01:11 -0400
Cc: Susan Hares <shares@ndzh.com>, IDR <idr@ietf.org>, GROW WG <grow@ietf.org>, "sidrops@ietf.org" <sidrops@ietf.org>, Warren Kumari <warren@kumari.net>, Job Snijders <job@ntt.net>, John Heasley <heas@shrubbery.net>, Jeff Haas <jhaas@pfrc.org>
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To: "Sriram, Kotikalapudi (Fed)" <kotikalapudi.sriram@nist.gov>
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Subject: Re: [Idr] [GROW] Deprecation of AS_SET and AS_CONFED_SET -- feedback requested
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> On Sep 25, 2019, at 11:32 PM, Sriram, Kotikalapudi (Fed) <kotikalapudi.sriram@nist.gov> wrote:
> 
> Jared,
> 
>> (Obviously my search in e-mail today went afoul, I see it’s adopted.. 
> 
> Yes, the draft was adopted. You can see the discussion here:
> https://mailarchive.ietf.org/arch/browse/idr/?gbt=1&q=WG%20adoption%20for%20draft-kumari-deprecate-as-set-confed-set  
> 
> One key point of the discussion was about the specification for action at 
> a receiver when an update with AS_SET or AS_CONFED_SET is received.
> The consensus seemed to be: treat as Withdraw.
> We'll soon update the draft to add that.
> 
> You had observed in that thread:
>> We should also (in parallel) reach out to some of the networks 
>> still using as_sets that are visible in the global BGP table.   
> 
> How do we do this? On NANOG, RIPE, etc. lists? Please advise.
> 
>> I did notice after this a few more BGP announcements with AS_SET 
>> occurring on a very regular basis.  I suspect someone is doing some 
>> research on it, perhaps someone reading this e-mail :-)
> 
> The percentage of updates with AS_SET is observed to be about 0.05%.
> This has been in that ballpark for a long time.
> Are you computing the percentages in what you observe? 
> Is it much different from 0.05%?
> 
> Some recent measurements we have at NIST about this are as follow:
> (thanks to Lilia Hannachi - my colleague)

Looking at RIPE RIS Live data, it seems to be very often.  I rewrote my parser to something lazy and the way the RIS Live message shows up in the JSON is array of array which breaks my laziness.  The majority seem to be AS# 27738

Unparsable AS_PATH: /[196753, 3356, 2914, 12252, 23487, 27738, [27738]]/196753 3356 2914 12252 23487 27738 [27738]/ {'type': 'ris_message', 'data': {'timestamp': 1569509923.51, 'peer': '217.29.67.51', 'peer_asn': '196753', 'id': '217.29.67.51-1569509923.51-9791488', 'host': 'rrc10', 'type': 'UPDATE', 'path': [196753, 3356, 2914, 12252, 23487, 27738, [27738]], 'community': [[2914, 410], [2914, 1009], [2914, 2000], [2914, 3000], [3356, 2], [3356, 22], [3356, 86], [3356, 505], [3356, 666], [3356, 2074], [17152, 1]], 'origin': 'igp', 'aggregator': '23487:200.124.247.2', 'announcements': [{'next_hop': '217.29.67.51', 'prefixes': ['201.183.255.0/24']}]}}
Unparsable AS_PATH: /[57381, 42708, 2914, 12252, 23487, 27738, [27738]]/57381 42708 2914 12252 23487 27738 [27738]/ {'type': 'ris_message', 'data': {'timestamp': 1569509924.6, 'peer': '193.150.22.240', 'peer_asn': '57381', 'id': '193.150.22.240-1569509924.6-9205783', 'host': 'rrc00', 'type': 'UPDATE', 'path': [57381, 42708, 2914, 12252, 23487, 27738, [27738]], 'community': [[2914, 410], [2914, 1009], [2914, 2000], [2914, 3000], [42708, 200], [42708, 208]], 'origin': 'incomplete', 'aggregator': '23487:200.124.247.2', 'announcements': [{'next_hop': '193.150.22.240', 'prefixes': ['201.183.255.0/24']}]}}
Unparsable AS_PATH: /[14061, 3356, 6762, 23487, 27738, 27738, 27738, 27738, 27738, 27738, [27738]]/14061 3356 6762 23487 27738 27738 27738 27738 27738 27738 [27738]/ {'type': 'ris_message', 'data': {'timestamp': 1569509923.5, 'peer': '198.32.176.147', 'peer_asn': '14061', 'id': '198.32.176.147-1569509923.5-38413780', 'host': 'rrc14', 'type': 'UPDATE', 'path': [14061, 3356, 6762, 23487, 27738, 27738, 27738, 27738, 27738, 27738, [27738]], 'community': [[3356, 3], [3356, 22], [3356, 86], [3356, 575], [3356, 666], [3356, 2011], [6762, 1], [6762, 92], [6762, 10110], [14061, 402], [14061, 2000], [14061, 2005], [14061, 4000], [14061, 4004]], 'origin': 'igp', 'aggregator': '23487:200.124.224.2', 'announcements': [{'next_hop': '198.32.176.147', 'prefixes': ['200.124.229.0/24', '201.183.252.0/24', '200.124.225.0/24', '200.124.231.0/24', '200.124.227.0/24', '201.183.248.0/24', '200.124.228.0/24', '200.124.230.0/24', '201.183.243.0/24']}]}}
Unparsable AS_PATH: /[49605, 9002, 6762, 23487, 27738, 27738, 27738, 27738, 27738, 27738, [27738]]/49605 9002 6762 23487 27738 27738 27738 27738 27738 27738 [27738]/ {'type': 'ris_message', 'data': {'timestamp': 1569509924.54, 'peer': '91.206.52.102', 'peer_asn': '49605', 'id': '91.206.52.102-1569509924.54-9415897', 'host': 'rrc20', 'type': 'UPDATE', 'path': [49605, 9002, 6762, 23487, 27738, 27738, 27738, 27738, 27738, 27738, [27738]], 'community': [[9002, 9002], [9002, 64615], [49605, 9002]], 'origin': 'igp', 'aggregator': '23487:200.124.224.2', 'announcements': [{'next_hop': '91.206.52.102', 'prefixes': ['200.124.230.0/24', '201.183.248.0/24', '200.124.227.0/24', '200.124.231.0/24', '200.124.226.0/24', '200.124.229.0/24', '201.183.252.0/24', '201.183.243.0/24', '200.124.225.0/24', '200.124.224.0/24', '200.124.228.0/24']}]}}
Unparsable AS_PATH: /[60501, 196753, 6762, 23487, 27738, 27738, 27738, 27738, 27738, 27738, [27738]]/60501 196753 6762 23487 27738 27738 27738 27738 27738 27738 [27738]/ {'type': 'ris_message', 'data': {'timestamp': 1569509924.52, 'peer': '217.29.66.138', 'peer_asn': '60501', 'id': '217.29.66.138-1569509924.52-24972855', 'host': 'rrc10', 'type': 'UPDATE', 'path': [60501, 196753, 6762, 23487, 27738, 27738, 27738, 27738, 27738, 27738, [27738]], 'community': [[6762, 1], [6762, 31], [6762, 40], [6762, 10110], [17152, 1]], 'origin': 'igp', 'aggregator': '23487:200.124.224.2', 'announcements': [{'next_hop': '217.29.66.138', 'prefixes': ['201.183.252.0/24', '200.124.227.0/24', '200.124.230.0/24', '201.183.243.0/24', '200.124.225.0/24', '200.124.229.0/24', '200.124.228.0/24', '200.124.231.0/24', '201.183.248.0/24']}]}}