Re: [Idr] Unknown Attributes seen in the wild

Robert Raszuk <robert@raszuk.net> Sun, 30 October 2016 18:05 UTC

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From: Robert Raszuk <robert@raszuk.net>
Date: Sun, 30 Oct 2016 19:05:49 +0100
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To: Colin Petrie <colin@spakka.net>
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Subject: Re: [Idr] Unknown Attributes seen in the wild
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Colin,

> ​
Perhaps this is some internal SDN thing that leaked publicly ?

You are right ... attribute 243 is Contrail's OriginVnPath attribute useful
for more complex service chaining scenarios.

https://github.com/Juniper/contrail-controller/blob/82cdb6afee49b39e54364f18be8eeca725dd76f4/src/bgp/bgp_attr_base.h

With that let's also not forget about attributes 241 and 242 used for
multicast edge replication. The work on draft describing those last two
temporarily allocated attribute codes is currently being resubmitted. The
good news is that they should not be leaked as they are to be send in their
dedicated SAFIs so unless peer exchanges right capabilities they should be
quite contained.

https://github.com/Juniper/contrail-controller/blob/82cdb6afee49b39e54364f18be8eeca725dd76f4/src/net/bgp_af.h

Thx,
R.


We also found an interesting unknown attribute, code 243. This appeared
> at all our collectors but only during June 2016. We're not sure what it
> is. We saw it for 4500 different prefixes, but all of them had the
> following sequence of AS_PATH:
> "7018 4466 5673"
>
> Looking at the AS graphs on bgp.he.net, at a guess, it was probably
> either AS5673 or AS4466 who originated this.
>
> A bit of googling also reveals a mention of it here:
> https://bugs.launchpad.net/juniperopenstack/+bug/1599588
> "
>    Unknown Attribute (243), length: 8, Flags [OT]:
>      no Attribute 243 decoder
>      0x0000: 8071 369b 0000 0007
> "
>
> ​​
> Perhaps this is some internal SDN thing that leaked publicly?
>