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

Veerendranatha Reddy V <veerendranatha.reddy.v@ericsson.com> Wed, 19 August 2020 04:23 UTC

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From: Veerendranatha Reddy V <veerendranatha.reddy.v@ericsson.com>
To: Peter Psenak <ppsenak=40cisco.com@dmarc.ietf.org>, "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: Wed, 19 Aug 2020 04:23:49 +0000
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Subject: Re: [Lsr] Regarding OSPF Extended Prefix Range TLV usage for External/NSSA prefixes defined in RFC 8665
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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.
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 <ppsenak=40cisco.com@dmarc.ietf.org> 
Sent: Tuesday, August 18, 2020 11:06 PM
To: Veerendranatha Reddy V <veerendranatha.reddy.v@ericsson.com>; lsr@ietf.org
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
>

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