Wireshark-bugs: [Wireshark-bugs] [Bug 10304] BGP: ISIS TLV 14 (Originating LSP Buffer Size) and
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Mon, 27 Apr 2015 08:36:10 +0000

Comment # 12 on bug 10304 from 
Thanks a lot for adding decode for TLV 149!

Based on draft-previdi-isis-segment-routing-extensions-05, Section 2.4.3:


   The 'Range' field provides the ability to specify a range of
   addresses and their associated Prefix SIDs.  It is essentially a
   compression scheme to distribute a continuous Prefix and their
   continuous, corresponding SID/Label Block.  If a single SID is
   advertised then the range field MUST be set to one.  For range
   advertisements > 1, the number of addresses that need to be mapped
   into a Prefix-SID and the starting value of the Prefix-SID range.


Therefore, value '0' for 'Range' is illegal. I think, Wireshark should flag
that as illegal (I just opened some pcap file that contains TLV 149 with
range=0, and it is not flagged).

In fact, we have open bug with Juniper as well, as Junos uses range=0. They
agreed that it is wrong, and they are working to change that in Junos as well.

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