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Today's Topics:
1. Re: Fix for communities starting with 0: (Faidon Liambotis)
----------------------------------------------------------------------
Message: 1
Date: Thu, 06 Nov 2014 15:29:30 +0200
From: Faidon Liambotis <parav...@debian.org>
To: Daryl Collins <da...@htb.com.au>, irrtoolset@lists.isc.org
Subject: Re: Fix for communities starting with 0:
Message-ID: <545b77ba.8050...@debian.org>
Content-Type: text/plain; charset=utf-8; format=flowed
Hi Daryl,
On 09/30/14 05:24, Daryl Collins wrote:
> I'm still developing the odd patch for RtConfig as we encounter issues
> in our environment. In general I'd be keen to work with the community
> to get as many of our patches as possible (specifically XR support) into
> a new release of IRRToolSet.
>
> Latest issue we've found is that if you do something like:
> community= {0:20000}
>
> The output for Cisco IOS & Cisco XR drops the 0:
>
> Patch to fix is below.
Well, first of all, the code is incorrect here; "high" is an unsigned
int, so the < 0 check is superfluous. As you can see from the code,
though this isn't an off-by-one error or some other accidental mistake:
the code explicitly checks for 0 and 0xFFFF.
RFC 1997 (BGP Communities Attribute) says on the matter: "The community
attribute values ranging from 0x0000000 through 0x0000FFFF and
0xFFFF0000 through 0xFFFFFFFF are hereby reserved.". JunOS doesn't
accept those two values either.
I think this may be a configuration mistake on your part and a too
relaxed, non-RFC-compliant implementation on Cisco's part.
Faidon
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End of irrtoolset Digest, Vol 49, Issue 1
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