[OSPF] regarding draft-ppsenak-ospf-te-link-attr-reuse-00

["xuling (F)" <[e-mail]>]

Hi Acee,

I suggest to advertise SRLG only in the TE opaque LSA, and advertise TE capability to help understand whether node is TE enabled. If node isn’t TE enabled , SRLG shouldn’t be used for TE application; otherwise, SRLG can be used for TE application or for other application purposes.
the mechanism to advertise TE capability has been well defined in draft-ietf-ospf-rfc4970bis.

Best regards,
Ling




Hi Ling,



From: OSPF <[e-mail]<mailto:[e-mail]<mailto:[e-mail]%3cmailto:[e-mail]>>> on behalf of "xuling (F)" <[e-mail]<mailto:[e-mail]<mailto:[e-mail]%3cmailto:[e-mail]>>>

Date: Wednesday, January 6, 2016 at 2:28 AM

To: OSPF WG List <[e-mail]<mailto:[e-mail]<mailto:[e-mail]%3cmailto:[e-mail]>>>

Subject: [OSPF] regarding draft-ppsenak-ospf-te-link-attr-reuse-00





Hi, all



To make the node that is not TE enabled advertises link attributes for other applications, it is worth considering another choice which has least change to the protocol and implementation. The method is: advertising RI capability TLV in RI LSA when advertising TE LSA. TE capability bit in RI capability TLV can indicate whether link attributes should become part of TE topology.



In draft-ietf-ospf-rfc4970bis,



?an OSPF router advertising an OSPF RI LSA MAY include the Router Informational Capability TLV?? can be enhanced with: an OSPF router advertising an OSPF RI LSA should include Router Informational Capability TLV which can inform TE capability bit.



In this case, some improvement needs to be done in draft-ietf-ospf-rfc4970bis. These are my personal view.



The intent of RFC 4970 and the BIS version is that the drafts requiring new capabilities will define them and request IANA allocation as opposed to updating RFC 4970BIS for every new capability.



As for the mechanism, I think this would be rather unwieldy to attempt to get SRLG information from different LSAs. Rather, within the OSPF Routing Domain, I?d choose to advertise SRLGs either in the TE LSAs or the Prefix/Link Attribute LSAs.



Thanks,

Acee







Best regards,



Ling XU

________________________________
xuling
华为技术有限公司 Huawei Technologies Co., Ltd.
[Company_logo]

Phone:
Fax:
Mobile:
Email:
地址：深圳市龙岗区坂田华为基地 邮编：518129
Huawei Technologies Co., Ltd.
Bantian, Longgang District,Shenzhen 518129, P.R.China
http://www.huawei.com
________________________________
本邮件及其附件含有华为公司的保密信息，仅限于发送给上面地址中列出的个人或群组。禁
止任何其他人以任何形式使用（包括但不限于全部或部分地泄露、复制、或散发）本邮件中
的信息。如果您错收了本邮件，请您立即电话或邮件通知发件人并删除本邮件！
This e-mail and its attachments contain confidential information from HUAWEI, which
is intended only for the person or entity whose address is listed above. Any use of the
information contained herein in any way (including, but not limited to, total or partial
disclosure, reproduction, or dissemination) by persons other than the intended
recipient(s) is prohibited. If you receive this e-mail in error, please notify the sender by
phone or email immediately and delete it!