On January 30, 2018 at 11:43:53 PM, Shraddha Hegde (shrad...@juniper.net) wrote:
... (3) Section 4.5. mentions that a "new TLV called Graceful-Link-Shutdown is defined" for BGP-LS, but there are no details on the format, etc. The IANA Considerations section suggests a value, not for a TLV but for an NLRI Type! <Shraddha> OK. Refered section 3.1 of RFC 7752 and described the contents of the TLV IANA section seems ok to me. Could you be more specific what needs to change? BGP-LS Link NLRI Registry [RFC7752] >>>>>>>Registry i)Graceful-Link-Shutdown TLV - Suggested 1101 >>>>>>>TLV type Maybe it’s just me and I just don’t understand…which is completely possible. There are two points: (1) It looks like you’re defining a new Graceful-Link-Shutdown TLV for BGP-LS. This TLV (based on the updated description) has no information in it. How does the receiver know which link the sender is referring to? Note that for the OSPF graceful-link-shutdown sub-TLVs, you are indicating where to carry them so that there is an obvious indication of which link is being shutdown. I would like to see explicitly specified how the receiver associates this TLV with the appropriate link. Again, I may be missing the details. (2) The value for the TLV was reserved by IANA in the "BGP-LS NLRI-Types" registry, not in the "BGP-LS Node Descriptor, Link Descriptor, Prefix Descriptor, and Attribute TLVs” register, which is where I would have assumed a modifier to the link would reside. IOW, according to the registry you are defining a new NLRI Type, not a new TLV — and, according to the updated description in the document there’s no information in this NLRI. <Shraddha> The TLV code point registration should be in “BGP-LS Node Descriptor, Link Descriptor, Prefix Descriptor, and Attribute TLVs” I have corrected this in the document. Will e-mail to IANA for correction as well. Does that answer your concerns? That addresses the concern #2 above. I still don’t see anywhere how the receiver associates this (empty) TLV with the right link. Alvaro.
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