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Re: [Idr] [GROW] Measurements on Regular, Extended, and Large Communities

"Sriram, Kotikalapudi (Fed)" <kotikalapudi.sriram@nist.gov> Wed, 29 April 2020 23:05 UTC

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From: "Sriram, Kotikalapudi (Fed)" <kotikalapudi.sriram@nist.gov>
To: Colin Petrie <colin@spakka.net>, Nick Hilliard <nick@foobar.org>
CC: "idr@ietf.org" <idr@ietf.org>, GROW WG <grow@ietf.org>, "Hannachi, Lilia (IntlAssoc)" <lilia.hannachi@nist.gov>, "draft-heitz-idr-wklc@ietf.org" <draft-heitz-idr-wklc@ietf.org>
Thread-Topic: [GROW] Measurements on Regular, Extended, and Large Communities
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Date: Wed, 29 Apr 2020 23:04:58 +0000
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Subject: Re: [Idr] [GROW] Measurements on Regular, Extended, and Large Communities
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Thanks Nick and Colin. Insights you shared are helpful.

Colin:

>If you are analysing Route-Views table dumps (and not updates) then you
>won't see ECs because Quagga/FRR only dumps selected attributes into the
>MRT files [0]. ECs are not on the list of dumped attributes. LCs were
>added to the list as part of the LC implementation patch.

Our analysis sees LCs in both Quagga and FRR RouteViews collectors in RIBs and Updates.
We don't see ECs at all in any of these cases.
Some Quagga collectors show LCs in RIB (e.g., route-views3) and others don't (e.g., route-views2).

>RIPE's RIS implementation records all the received attributes opaquely
>so you will see ECs in there. They are also present within the
>route-views updates files (as these are dumped raw by Quagga).

Our measurements show LCs in RIPE-RIS but no ECs. 
Yep, we don't see ECs (in RIBs or Updates) in RIPE-RIS or Routeviews.
May be Nick is right about lack of compelling reason to use EC.
Examples (RIPE-RIS):
*********************************************************************
Community ANALYSIS (Collector : rrc00 2020-04-25:02)
*********************************************************************
# Updates = 366516 (Total)
# COMMUNITY = 293050 (79%)
AS path length distribution =    2: 1480 (0%)    3: 7177 (2%)    4: 20212 (6%)    5: 23894 (8%)    6: 17841 (6%)    7: 8023 (2%)    8: 2317 (0%)    9: 539 (0%)    10: 197 (0%)    11: 150 (0%)    12: 102 (0%)    13: 32 (0%)    14: 12 (0%)
# LARGE_COMMUNITY = 222778 (60%)
AS path length distribution =    2: 534 (0%)    3: 5066 (2%)    4: 18288 (8%)    5: 75891 (34%)    6: 76389 (34%)    7: 33773 (15%)    8: 9108 (4%)    9: 2151 (0%)    10: 833 (0%)    11: 247 (0%)    12: 232 (0%)    13: 54 (0%)    14: 6 (0%)    16: 1 (0%)
# EXTENDED COMMUNITIES = 0 (0%)

*********************************************************************
Community ANALYSIS (Collector : rrc15 2020-04-25:02)
*********************************************************************
# Updates = 115386 (Total)
# COMMUNITY = 92189 (79%)
AS path length distribution =    1: 67 (0%)    2: 5996 (6%)    3: 23925 (25%)    4: 26179 (28%)    5: 16973 (18%)    6: 10503 (11%)    7: 4418 (4%)    8: 1153 (1%)    9: 305 (0%)    10: 79 (0%)    11: 55 (0%)    12: 38 (0%)    13: 19 (0%)    14: 6 (0%)
# LARGE_COMMUNITY = 2555 (2%)
AS path length distribution =    2: 89 (3%)    3: 1312 (51%)    4: 609 (23%)    5: 429 (16%)    6: 104 (4%)    7: 9 (0%)    8: 3 (0%)
# EXTENDED COMMUNITIES = 0 (0%)

Sriram

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