Re: [spring] Two questions about the draft-hu-rtgwg-srv6-egress-protection-08

Huzhibo <huzhibo@huawei.com> Wed, 08 July 2020 08:21 UTC

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From: Huzhibo <huzhibo@huawei.com>
To: Heminhong <he.minhong@h3c.com>, "Huaimo.chen@futurewei.com" <Huaimo.chen@futurewei.com>, "chenhuan6@chinatelecom.cn" <chenhuan6@chinatelecom.cn>, "Wupeng (Baggio, VRP MKT)" <baggio.wupeng@huawei.com>, "mehmet.toy@verizon.com" <mehmet.toy@verizon.com>, "caoc15@chinaunicom.cn" <caoc15@chinaunicom.cn>, "het21@chinaunicom.cn" <het21@chinaunicom.cn>, "liulei.kddi@gmail.com" <liulei.kddi@gmail.com>, "xufeng.liu.ietf@gmail.com" <xufeng.liu.ietf@gmail.com>
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Thread-Topic: Two questions about the draft-hu-rtgwg-srv6-egress-protection-08
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Date: Wed, 8 Jul 2020 08:21:31 +0000
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Subject: Re: [spring] Two questions about the draft-hu-rtgwg-srv6-egress-protection-08
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Yes, If it isn`t the last Sid,It will execut other protection behavior.

Thanks
Zhibo
From: Heminhong [mailto:he.minhong@h3c.com]
Sent: Wednesday, July 8, 2020 2:37 PM
To: Huzhibo <huzhibo@huawei.com>om>; Huaimo.chen@futurewei.com; chenhuan6@chinatelecom.cn; Wupeng (Baggio, VRP MKT) <baggio.wupeng@huawei.com>om>; mehmet.toy@verizon.com; caoc15@chinaunicom.cn; het21@chinaunicom.cn; liulei.kddi@gmail.com; xufeng.liu.ietf@gmail.com
Cc: rtgwg@ietf.org; spring@ietf.org
Subject: 答复: Two questions about the draft-hu-rtgwg-srv6-egress-protection-08

Excuse

if SL ==1 or  (T, Mirror SID A4:1::3) (A1:1::, A2:1::B100)( A3:1::B100, A2:1::B100)(SRH),when A2:1::B100 is PE3's END SID, it will execut midpoint-protection ?



Thanks for your time, Looking forward to your reply.
Best regards.
Sincerely yours,
minhong

发件人: Huzhibo [mailto:huzhibo@huawei.com]
发送时间: 2020年7月8日 10:38
收件人: heminhong (RD) <he.minhong@h3c.com<mailto:he.minhong@h3c.com>>; Huaimo.chen@futurewei.com<mailto:Huaimo.chen@futurewei.com>; chenhuan6@chinatelecom.cn<mailto:chenhuan6@chinatelecom.cn>; Wupeng (Baggio, VRP MKT) <baggio.wupeng@huawei.com<mailto:baggio.wupeng@huawei.com>>; mehmet.toy@verizon.com<mailto:mehmet.toy@verizon.com>; caoc15@chinaunicom.cn<mailto:caoc15@chinaunicom.cn>; het21@chinaunicom.cn<mailto:het21@chinaunicom.cn>; liulei.kddi@gmail.com<mailto:liulei.kddi@gmail.com>; xufeng.liu.ietf@gmail.com<mailto:xufeng.liu.ietf@gmail.com>
抄送: rtgwg@ietf.org<mailto:rtgwg@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>
主题: RE: Two questions about the draft-hu-rtgwg-srv6-egress-protection-08

Hi minhong:
Question 1: draft-hu-rtgwg-srv6-egress-protection-08 compliance draft-ietf-spring-srv6-network-programming,It use H.Encaps Encapsulating the Repair List。
Question 2: Only if SL == 0 or No SRH, It will execut the mirror behavior。If the End Sid is the last sid,It will mirror behavior。Or It will execut other protect behavior.

Thanks
Zhibo
From: Heminhong [mailto:he.minhong@h3c.com]
Sent: Wednesday, July 8, 2020 9:42 AM
To: Huzhibo <huzhibo@huawei.com<mailto:huzhibo@huawei.com>>; Huaimo.chen@futurewei.com<mailto:Huaimo.chen@futurewei.com>; chenhuan6@chinatelecom.cn<mailto:chenhuan6@chinatelecom.cn>; Wupeng (Baggio, VRP MKT) <baggio.wupeng@huawei.com<mailto:baggio.wupeng@huawei.com>>; mehmet.toy@verizon.com<mailto:mehmet.toy@verizon.com>; caoc15@chinaunicom.cn<mailto:caoc15@chinaunicom.cn>; het21@chinaunicom.cn<mailto:het21@chinaunicom.cn>; liulei.kddi@gmail.com<mailto:liulei.kddi@gmail.com>; xufeng.liu.ietf@gmail.com<mailto:xufeng.liu.ietf@gmail.com>
Cc: rtgwg@ietf.org<mailto:rtgwg@ietf.org>; spring@ietf.org<mailto:spring@ietf.org>
Subject: Two questions about the draft-hu-rtgwg-srv6-egress-protection-08

Dear,

1.     About P1 how to encapsulate the packet
draft-hu-rtgwg-srv6-egress-protection-07, the following description : “When PE3 fails, node P1 protects PE3 through sending the packet to PE4 via the backup path pre-computed. P1 modifies the packet before sending it to PE4. The modified packet has destination PE4 with mirror SID A4:1::3, and SRH with PE3’s VPN SID A3:1::B100 and the mirror SID A4:1::3 (i.e., "A3:1::B100, A4:1::3; SL=1"). ”
However,draft-hu-rtgwg-srv6-egress-protection-08,the following description:  “When PE3 fails, P1 as PLR sends the packet to PE4 via the backup path pre-computed.  P1 encapsulates the packet using H.Encaps before sending it to PE4.”

2、
                                   END SID: A2:1::B100
                 *******  *******  VPN SID: A3:1::B100
             [PE1]-----[P1]-----[PE3]---[CE2]      PE3 Egress
             / |        |&        | \   /          PE4 Backup Egress
            /  |        |&        |  \ /           CEx Customer Edge
       [CE1]   |        |&        |   X            Px  Non-Provider Edge
            \  |        |&        |  / \           *** SR Path
             \ |        |& &&&&&  | /   \          &&& Backup Path
             [PE2]-----[P2]-----[PE4]---[CE3]
                                   VPN SID: A4:1::B100
                                Mirror SID: A4:1::3, protect PE3

               Figure 2: PE4 Protects Egress PE3 of SR Path

   Suppose that the packet received by P1 is represented by Pkt = (SA =
   A1:1::, DA = A2:1::B100)Pkt0, where DA = A2:1::B100 is PE3's END SID,
   and Pkt0 is the rest of the packet.  The encapsulated packet Pkt'
   will be one of the followings:


l  Pkt' = (T, Mirror SID A4:1::3) (A1:1::, A2:1::B100)( A3:1::B100, A2:1::B100)Pkt0, how to process?



Processing on the receiver or on the sender?





Thanks for your time, Looking forward to your reply.
Best regards.
Sincerely yours,
minhong
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