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Re: [Idr] I-D Action: draft-previdi-idr-segment-routing-te-policy-07.txt

Eric C Rosen <erosen@juniper.net> Mon, 09 October 2017 22:44 UTC

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To: Robert Raszuk <robert@raszuk.net>
Cc: Nandan Saha <nandan@arista.com>, stefano previdi <stefano@previdi.net>, idr wg <idr@ietf.org>
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From: Eric C Rosen <erosen@juniper.net>
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Subject: Re: [Idr] I-D Action: draft-previdi-idr-segment-routing-te-policy-07.txt
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On 10/9/2017 5:07 PM, Robert Raszuk wrote:
> How do you generate MP_UNREACH_NLRI to send withdraw if you did not 
> completely parsed all NLRIs sitting in MP_REACH_NLRI attribute in the 
> first place ?

Suppose the MP_REACH had 3 NLRIs in it, each one 16 octets long. The 
first octet of each (the NLRI length field) has value 120 (120 bits == 
15 octets).

These NLRIs are not of legal length according to the sr-te-policy draft, 
but I don't see why you couldn't put each into an MP_UNREACH.  Certainly 
there's no reason to reset the BGP session.

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