Re: [Idr] some questions from {RC, LC, EC} analysis presentation in GROW

"Sriram, Kotikalapudi (Fed)" <kotikalapudi.sriram@nist.gov> Wed, 04 August 2021 16:58 UTC

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From: "Sriram, Kotikalapudi (Fed)" <kotikalapudi.sriram@nist.gov>
To: Zhuangshunwan <zhuangshunwan@huawei.com>, "Sriram, Kotikalapudi (Fed)" <kotikalapudi.sriram=40nist.gov@dmarc.ietf.org>, GROW WG <grow@ietf.org>
CC: IDR <idr@ietf.org>
Thread-Topic: some questions from {RC, LC, EC} analysis presentation in GROW
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Date: Wed, 4 Aug 2021 16:58:00 +0000
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Subject: Re: [Idr] some questions from {RC, LC, EC} analysis presentation in GROW
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Hi Shunwan,

Yes, that is a curious thing ... it seems peculiar and specific to AS 3356. 
I have started a discussion on NANOG about 3356:666, 3356:9999, etc. 
Please take a look:
https://mailman.nanog.org/pipermail/nanog/2021-August/thread.html#214447 

Only AS 3356 may be an outlier. Most other AS operators use ASN:666 or WKC 65535:666 for Blackhole Community:
https://www.google.com/search?q=BGP+community+%3A666&rlz=1C1GCEV_enUS847US847&oq=BGP+community+%3A666&aqs=chrome..69i57j69i64.9798j1j15&sourceid=chrome&ie=UTF-8&safe=active&ssui=on 

Also, we'll check -- on slide 12 of my GROW presentation -- out of the roughly 265K count of unique {Prefix, AS Path, RC = Any:666}, how many are with 3356:666. I will let you know.

Sriram 

________________________________________
From: GROW <grow-bounces@ietf.org> on behalf of Zhuangshunwan <zhuangshunwan@huawei.com>
Sent: Tuesday, August 3, 2021 10:37 PM
To: Sriram, Kotikalapudi (Fed); GROW WG
Cc: IDR
Subject: Re: [GROW] some questions from {RC, LC, EC} analysis presentation in GROW

Hi Sriram,

The community attribute example 3356:666 on page 10 may not match the actual function.
"
Example: AS path = 25160 3356 12956 6147 and RC = 3356:666
 This means that the client is at AS 6147 (origin AS) and AS 3356 is the RTBH provider
 AS Distance to RTBH provider = 2
 Propagation (#hops): The Blackhole Community propagated 3 hops in this case (AS 6147 to AS 25160)
"

According to https://onestep.net/communities/as3356/ 
...
--------------------------------------------------------
prefix type communities
--------------------------------------------------------
3356:123 - Customer route
3356:666 - Peer route
--------------------------------------------------------
...
--------------------------------------------------------
customer traffic engineering communities - Blackhole
--------------------------------------------------------
3356:9999 - blackhole (discard) traffic

Traffic destined for any prefixes tagged with this
community will be discarded at ingress to the Level 3
network. The prefix must be one permitted by the
customer's existing ingress BGP filter.
For some router vendors the peering
must be changed to an eBGP multihop session on the Level
3 side of the connection.
...

Regards,
Shunwan