Re: [OSPF] Signaling Entropy Label Capability Using OSPF - draft-ietf-ospf-mpls-elc-00

"Acee Lindem (acee)" <acee@cisco.com> Wed, 13 April 2016 12:41 UTC

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Xuxiaohu <xuxiaohu@huawei.com>, "draft-ietf-ospf-mpls-elc@ietf.org" <draft-ietf-ospf-mpls-elc@ietf.org>
Thread-Topic: Signaling Entropy Label Capability Using OSPF - draft-ietf-ospf-mpls-elc-00
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Date: Wed, 13 Apr 2016 12:41:17 +0000
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Cc: OSPF WG List <ospf@ietf.org>
Subject: Re: [OSPF] Signaling Entropy Label Capability Using OSPF - draft-ietf-ospf-mpls-elc-00
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Hi Tiger, 

On 4/13/16, 3:41 AM, "Xuxiaohu" <xuxiaohu@huawei.com> wrote:

>Hi Acee,
>
>Thanks for your comments. Please see my response in line.
>
>> -----Original Message-----
>> From: Acee Lindem (acee) [mailto:acee@cisco.com]
>> Sent: Tuesday, April 12, 2016 1:39 AM
>> To: draft-ietf-ospf-mpls-elc@ietf.org
>> Cc: OSPF WG List
>> Subject: Signaling Entropy Label Capability Using OSPF -
>> draft-ietf-ospf-mpls-elc-00
>> 
>> Authors,
>> 
>> We will soon be progressing the OSPFv2 SR draft. What is your intent
>>for this
>> draft? It is missing:
>> 
>>     1. A figure with the RI encoding like other OSPF documents
>
>Will add two figures for ELC TLV and RLSDC TLV respectively.

Can you come up with a better name than RLSDC? It appears this would
obviate the need for the recent MSD proposal but that is a much better
name. 

>
>>     2. Discussion as to precisely how the capability would be used by a
>>router in
>> an OSPF routing domain. For example, must a router remove the EL if the
>> next-hop doesn’t support it?
>
>This document only describes how the ELC and RLSDC are advertised via
>OSPF. As for how these capabilities would be used are actually described
>in https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label. By
>the way, a router doesn't need to remove the EL if the next-hop doesn't
>support it. The only requirement on using EL is: An ingress LSR cannot
>insert ELs for packets going into a given tunnel unless an egress LSR has
>indicated via signaling that it can process ELs on that tunnel.

Can you add a short section referencing the applicable section in this
document. 


>
>>     3. A discussion of backward compatibility for the new
>>Router-Information
>> LSA capability.
>
>Is it enough to add the following text:
>
>"To be compatible with RFC7770, ELC and RLSDC TLVs SHOULD continue to be
>advertised in the first instance, i.e., 0, of the Router Information LSA."

I was talking more on the level of usage of the capability than
advertisement. Since this is new, there should be any RI LSAs
considerations. 

Thanks,
Acee  



>
>Best regards,
>Xiaohu
>
>> Thanks,
>> Acee
>