On January 25, 2018 at 12:31:16 AM, Shraddha Hegde (shrad...@juniper.net) wrote:
Shraddha: Hi! ... (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. ... (6) 5.1 says that the metrics "MUST be set to MaxLinkMetric...and SHOULD be set to MAX-TE-METRIC". Why is there a difference? <Shraddha> TE is an optional feature so MAX-TE-METRIC needs to be set only when TE is enabled on the node. I think that the use of TE is obvious at the point of setting the metric — IOW, if TE is not used then it doesn’t mater what this document says. But if TE is used, then having a MUST makes it clear that MAX-TE-METRIC is the metric to be used and that there are no other values or circumstances where a different value should be considered. Alvaro.
_______________________________________________ OSPF mailing list OSPF@ietf.org https://www.ietf.org/mailman/listinfo/ospf
