Hi Peter, It is not related to SRMS. If there exist ISIS/OSPF or two instances of OSPF in same device, and all are supporting ST, then I can redistribute SR Prefix information to OSPF from other OSPF instance or from ISIS. In this case, I may use range TLV to reduce the number of Prefix TLVs, by using Range TLV, if prefixes and SID are able to convert to Range TLV.
Thanks & Regards, Veerendranath -----Original Message----- From: Peter Psenak <[email protected]> Sent: Wednesday, August 19, 2020 1:23 PM To: Veerendranatha Reddy V <[email protected]>; [email protected] Subject: Re: [Lsr] Regarding OSPF Extended Prefix Range TLV usage for External/NSSA prefixes defined in RFC 8665 Hi Veerendranatha, On 19/08/2020 06:23, Veerendranatha Reddy V wrote: > Hi Peter, > While redistributing prefix Sid for the prefixes from other protocols (Ex: > from ISIS or other OSPF instances), we can consider as range TLV for the > prefixes which are advertised in the range TLV in that protocol. I don't follow. Are you talking about redistribution of SRMS advertisement between protocols? Such thing has not been defined. thanks, Peter > If it is NSSA, then we need to advertise these redistributed prefixes as area > scope, so Range TLV also need to be part of area scope Opaque LSA. > > Thanks & Regards, > Veerendranath > > -----Original Message----- > From: Peter Psenak <[email protected]> > Sent: Tuesday, August 18, 2020 11:06 PM > To: Veerendranatha Reddy V <[email protected]>; > [email protected] > Subject: Re: [Lsr] Regarding OSPF Extended Prefix Range TLV usage for > External/NSSA prefixes defined in RFC 8665 > > Veerendranath, > > On 18/08/2020 16:40, Veerendranatha Reddy V wrote: >> Hi Authors, All, >> >> OSPF Extended Prefix Range TLV defined in RFC 8665 has IA flag to >> distinguish between Intra and Inter Area scope prefixes. >> >> Whether any restrictions to not to use Prefix Range TLV for >> external/NSSA prefixes ? > > I don't see how you can use OSPF Extended Prefix Range TLV for NSSA, the > usage of OSPF Extended Prefix Range TLV has only been defined in the context > of RFC 8665. > > thanks, > Peter > > >> >> For External Prefixes, we can able to use Prefix Range TLV by using >> LSA type (based on AS scope Opaque Type , so the TLV is for External >> Prefixes) >> >> But If we need to use the Prefix Range TLV for NSSA prefixes (Type-7) >> , which are in area scope, there is no flag/route-type field in this >> TLV to distinguish between Intra or NSSA prefixes( as IA flag will >> not be set anyway). >> >> Thanks & Regards, >> >> Veerendranath >> > > > _______________________________________________ Lsr mailing list [email protected] https://www.ietf.org/mailman/listinfo/lsr
