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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 08:03 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 08:03:21 +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,
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 <ppsenak=40cisco.com@dmarc.ietf.org> 
Sent: Wednesday, August 19, 2020 1:23 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

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 <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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