Hi Ketan, Cheng,
Thanks for your reply.
I have get clear answer to my questions.
The third question is meaningless once the typo is corrected.
I also suggest that "structure TLV" can not be palced under section 7, as Cheng
suggested.
Regards,
PSF
原始邮件
发件人：KetanTalaulikar(ketant) <ketant=40cisco....@dmarc.ietf.org>
收件人：Chengli (Cheng Li) <c...@huawei.com>;彭少富10053815;
抄送人：i...@ietf.org <i...@ietf.org>;spring@ietf.org <spring@ietf.org>;
日 期 ：2020年09月09日 15:07
主 题 ：Re: [spring] [Idr] questions about draft-ietf-idr-bgpls-srv6-ext-03
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Hi PSF and Cheng,
Please check inline below.
From: Chengli (Cheng Li) <c...@huawei.com>
Sent: 07 September 2020 09:49
To: peng.sha...@zte.com.cn; Ketan Talaulikar (ketant) <ket...@cisco.com>
Cc: i...@ietf.org; spring@ietf.org
Subject: RE: [Idr] questions about draft-ietf-idr-bgpls-srv6-ext-03
Hi PSF and Ketan,
IMHO, the SRv6 SID Structure TLV can be included in the sub-TLV field of SRv6
END.X TLV, SRv6 LAN END.X TLV (for adj SIDs) and SRv6 SID NLRI(for
node SIDs). So I guess it may be a typo, the SRv6 End should be SRv6 End.X.
[KT] You are correct. It should be End.X and not End. Will fix this typo in the
next update.
We can double check the IANA section.
But from the text in Section 7, SRv6 SID attributes,
This section specifies the new TLVs to be carried in the BGP Link
State Attribute associated with the BGP-LS SRv6 SID NLRI.
The sub-TLVs defined in this section are associated with the SRv6 SID NLRI, so
these sub-TLVs are associated with node SIDs.
[KT] This is correct – they are SIDs associated with the node.
Regarding Adj SIDs, the information is included in the Link NLRI. If so, do we
need to make a new upper level for SRv6 SID Structure sub-TLV? Because
it is not only apply for node SIDs but also link/adj SIDs.
[KT] I do not understand what you mean by “new upper level for SRv6 SID
Structure sub-TLV”? Sec 7.3 clearly says how it can be encoded
It is an optional TLV
for use in the BGP-LS Attribute for an SRv6 SID NLRI and as an
optional sub-TLV of the SRv6 End.X, IS-IS SRv6 LAN End.X and OSPFv3
SRv6 LAN End.X TLVs.
Regarding the second question. I think,
an Adj-SID is included in the Link NLRI, with an optional SID Structure TLV as
a sub-TLV. SRv6 SID NLRI and attributes are not needed to be included.
[KT] Correct – we are talking about End.X and LAN End.X here.
a Node SID is included in the SRv6 SID NLRI, with TLVs like SRv6 Endpoint
Behavior TLV, SRv6 BGP Peer Node SID TLV, SRv6 SID Structure TLV in the SRv6
SID attributes to describe the
information of the node SID.
[KT] Correct.
[KT] I did not understand the third question from PSF
Thanks,
Ketan
Respect,
Cheng
From: Idr [mailto:idr-boun...@ietf.org]On Behalf Of peng.sha...@zte.com.cn
Sent: Monday, September 7, 2020 11:13 AM
To: ket...@cisco.com
Cc: i...@ietf.org; spring@ietf.org
Subject: [Idr] questions about draft-ietf-idr-bgpls-srv6-ext-03
Hi Ketan,
I have a question for section 7.3. SRv6 SID Structure TLV, and hope to get
your answer.
It described:
SRv6 SID Structure TLV is used to advertise the length of each individual
part of the SRv6 SID as defined in
[I-D.ietf-spring-srv6-network-programming]. It is an optional TLV for use in
the BGP-LS Attribute for an SRv6 SID NLRI and as an optional sub-TLV of the
SRv6 End, IS-IS SRv6 LAN End.X and OSPFv3 SRv6 LAN End.X TLVs. The TLV has
the following format:
My question is:
1) Becasue section 7 mentions that "This section specifies the new TLVs to be
carried in the BGP Link State Attribute associated with the BGP-LS SRv6 SID
NLRI.",
so, can "structure TLV" be also associated with BGP-LS Link NLRI ?
2) As the description, does it mean that an SRv6 SID NLRI can contain SRv6 SID
Information TLV for END SID or LAN End.X SID, then "structure TLV" is also
associated with BGP-LS Link
NLRI ?
3) Why the description skip End.X SID ?
Regards,
PSF_______________________________________________
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