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[Lsr] Regarding OSPF Extended Prefix Range TLV usage for External/NSSA prefixes defined in RFC 8665

Veerendranatha Reddy V <veerendranatha.reddy.v@ericsson.com> Tue, 18 August 2020 14:40 UTC

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From: Veerendranatha Reddy V <veerendranatha.reddy.v@ericsson.com>
To: "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] Regarding OSPF Extended Prefix Range TLV usage for External/NSSA prefixes defined in RFC 8665
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Date: Tue, 18 Aug 2020 14:40:02 +0000
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Subject: [Lsr] Regarding OSPF Extended Prefix Range TLV usage for External/NSSA prefixes defined in RFC 8665
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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 ?
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

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