Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 151601A877C; Sat, 18 Jul 2015 12:41:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.76 X-Spam-Level: X-Spam-Status: No, score=-1.76 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, MIME_CHARSET_FARAWAY=2.45, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cwNZt053TkGW; Sat, 18 Jul 2015 12:41:16 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BFD081A876E; Sat, 18 Jul 2015 12:41:14 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml405-hub.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BVI32305; Sat, 18 Jul 2015 19:41:12 +0000 (GMT) Received: from NKGEML403-HUB.china.huawei.com (10.98.56.34) by lhreml405-hub.china.huawei.com (10.201.5.242) with Microsoft SMTP Server (TLS) id 14.3.235.1; Sat, 18 Jul 2015 20:41:11 +0100 Received: from NKGEML512-MBS.china.huawei.com ([169.254.8.210]) by nkgeml403-hub.china.huawei.com ([10.98.56.34]) with mapi id 14.03.0158.001; Sun, 19 Jul 2015 03:41:05 +0800 From: "Dongjie (Jimmy)" To: Yimin Shen , "huubatwork@gmail.com" , "draft-cheng-mpls-tp-shared-ring-protection@tools.ietf.org" Thread-Topic: [mpls] MPLS-RT review of draft-cheng-mpls-tp-shared-ring-protection-05 Thread-Index: AQHQvJH4pquZf7Jq8UugpHR0X1UcZp3ZFu+AgAiM3ME= Date: Sat, 18 Jul 2015 19:41:04 +0000 Message-ID: <76CD132C3ADEF848BD84D028D243C927742BD4A2@NKGEML512-MBS.china.huawei.com> References: <55A248D2.1010001@gmail.com>, In-Reply-To: Accept-Language: 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Hi Yimin,

 

Thanks for your comments, please see my replies inlined with= [Jie].

 

 

From: mpls [mpls-bounces@ietf.org] on beha= lf of Yimin Shen [yshen@juniper.net]
Sent: Tuesday, July 14, 2015 0:43
To: huubatwork@gmail.com; draft-cheng-mpls-tp-shared-ring-protection= @tools.ietf.org
Cc: mpls@ietf.org; mpls-chairs@ietf.org
Subject: Re: [mpls] MPLS-RT review of draft-cheng-mpls-tp-shared-rin= g-protection-05

Hi Huub,

 

Thanks for the response.

 

Yes, the ring tunnel layer should deserve = a greater level of detail in this draft.

 

 

Regarding the =A1=B0ring-map=A1=B1=A1=AD Y= ou mentioned it in answering  a few of my top questions, but didn=A1= =AFt elaborate to support your anwers. IMO, the ring map is an important piece of your solution as well, and should not be pushed out of = scope (below). I=A1=AFd like to suggest to decribe what information it cont= ains, how it is built, how  the information is distributed and synchro= nized between nodes, etc.

 

[Jie] As show= n in figure 8 and 9 of the document, the ring-map includes the ring to= pology and the status of the ring links.  The ring topology is configured via NMS, the state of each ring link is monitored b= y OAM. When there is some failure detected via OAM, such failure informatio= n is advertised via the RPS protocol. This way, each node gets the ring-map= information.

&nbs= p;

 

=A1=B0Each node SHOULD have a ring map containing informat=
ion about the sequence of the nodes around the ring.  The method of co=
nfiguring the nodes with the ring maps is out of scope of this document.=A1=
=B1

 

 

The entire section 4.4 still remains as a = problem for me. IMO, the ingress node and the egress node of a service LSP = has a forwarding adjacency at the service LSP level, across the entire ring (or inter-connected rings). The LSP=A1= =AFs label should be transparent to intermediate ring nodes, and no interme= diate ring nodes should perform forwarding based this label. Does this matc= h the goals/requirements of this draft? There would be some problems if you want an intermediate ring node (ring i= nterconnection node in this case) to understand a service LSP label. Also, = I=A1=AFm not sure how the ring map could help in this case. Therefore, unti= l I see some clarification, I still don=A1=AFt understand how section 4.4 would work in both normal forwarding and protec= tion mode.

 

[Jie] Agree t= hat the interconnected ring operation needs more clarification . Actually o= n the intersection node of two rings, the inner label (LSP label) also needs to be swapped, which explains why the interse= ction node need to check the inner label. This is not explicitly specified = in the current draft, which may cause some confusion. Some clarificati= on will be added in next revision.

 

Best regards,

Jie<= /p>

 

Thanks,

 

/Yimin

 

 

From: Huub van= Helvoort [mailto:huubatwork@gmail.com]
Sent: Sunday, July 12, 2015 7:01 AM
To: Yimin Shen; draft-cheng-mpls-tp-shared-ring-protection@tools.iet= f.org
Cc: mpls@ietf.org; mpls-chairs@ietf.org
Subject: Re: [mpls] MPLS-RT review of draft-cheng-mpls-tp-shared-rin= g-protection-05

 

Hello Yimin,

Thank you for your review.
Here is our response: in-line [Huub] on behalf of the authors.

Best regards. Huub.

=3D=3D=3D=3D=3D=3D
On 10-07-15 03:37, Yimin Shen wrote:

Dear authors, chairs, and WG

 

I=A1=AFve been asked by the WG chairs to review draft-chen= g-mpls-tp-shared-ring-protection-05 for WG adoption. Overall, I think the d= raft is trying to address a valid MPLS-TP scenario by using a promising solution. However, I have the following comm= ents and questions  for sections 1 to 4, which I would like to request= the authors to answer and clarify.

 

1.<= span style=3D"FONT: 7pt 'Times New Roman'">     &n= bsp; Section 2.1 =A8C Recovery of multiple failures

=A1=A4       =   This is misleading to me. The draft seems to only be able to= handle a single failure per ring, rather than multiple failures per ring. = This may need some clarification.

[Huub] Multiple failures means that more than one link or = node in the ring can fail. Protection can still be performed
in the "islands" created in this way. A node failure is in fact t= he same as adjacent link failures.
We can provide more clarification. 

 

2.<= span style=3D"FONT: 7pt 'Times New Roman'">     &n= bsp; I=A1=AFd like to suggest to change term =A1=B0exit node=A1= =B1 to =A1=B0egress node=A1=B1.

[Huub] OK.

 

3.<= span style=3D"FONT: 7pt 'Times New Roman'">     &n= bsp; Section 4.1 - The ring tunnel layer.

 

=A1=A4       =   Given a ring of N nodes, this layer would consist of 4xN rin= g tunnels. The draft is a little light on the provisioning and management a= spects of this layer, while pushing a lot of complexity to this layer.

[Huub] clarifying text can be added. We can add a section = describing provisioning the ring-nodes.

=A1=A4       =   Each node is traversed by many tunnels. How does it know whe= ther a tunnel is working or protecting,  and whether a tunnel is CW or= AW ? How does it associate a working tunnel with a protecting tunnel (to the same egress node, but opposite in directi= on) ?

[Huub] each node knows this because of the ring-map which = contains this information.

=A1=A4       =   When an ingress node needs a working tunnel to a particular = egress node, how does choose between the CW  tunnel and the AW tunnel,= especially when one is significantly longer  (i.e. of higher cost) than the other ?

[Huub] from the ring-map the ingress node knows what the s= hortest path is and then decides to take the CW or the AW tunnel.

 

4.<= span style=3D"FONT: 7pt 'Times New Roman'">     &n= bsp; The draft describes 4 tunnels (CW, AW, CP, AP) per egress no= de ? Is it possible to use only 2 tunnels (i.e. CW and AW) and have them pr= otect each other ?

[Huub] mixing working and protecting traffic in a single t= unnel would make the RPS protocol more complex.
An egress node cannot make the distinction.

 

5.<= span style=3D"FONT: 7pt 'Times New Roman'">     &n= bsp; Section 4.3.2 -- Short wrapping vs. =A1=B0traditional wrappi= ng=A1=B1

 

=A1=A4       =   Does =A1=B0traditional wrapping=A1=B1 refer to the scenario = in section 4.3.1 ?

[Huub] No it doesn't, section 4.3.1 explains wrapping for = link failure and node failure.
[Huub] the description of traditional wrapping is in the first paragraph of= section 4.3.2, more clarification can be added.

=A1=A4       =   The 4.3.2 mode seems superior to the 4.3.1 mode in all aspec= ts. If so, would there be any value to keep 4.3.1 mode.

[Huub] 4.3.1 explains wrapping methodology, its applicatio= n is described in 4.3.2.

=A1=A4       =   In 4.3.2 mode, CW tunnel =3D=3DCP tunnel and AW tunnel =3D= =3D AP tunnel in path topology, correct ? If so, you could reduce the numbe= r of tunnels per egress node from 4 to 2 (as comment [4] above), correct ?

[Huub] No, not correct. During a protection switch CW tunn= el =3D=3D> AP tunnel and AW tunnel =3D=3D> CP tunnel.

 

6.<= span style=3D"FONT: 7pt 'Times New Roman'">     &n= bsp; Section 4.3.3

 

=A1=A4       =   This is equivalent to =A1=B0global repair=A1=B1 in MPLS. How= ever, why does the ingress node switch traffic from CW tunnel to AP tunnel = instead of AW tunnel ? A working tunnel should be =A1=B0better=A1=B1 than a protecting tunnel to permanently carry traffi= c.

[Huub] to operate properly ring protection switching has t= o be revertive, after repair the traffic should be switched back to working= (shortest path)

7.<= span style=3D"FONT: 7pt 'Times New Roman'">     &n= bsp; Section 4.4

 

=A1=A4       =   I=A1=AFm not sure how label swap would work on an interconne= ction node, as the draft describes it. In Fig-12, in normal state, F receiv= es a packet from ring-1; The top label X is a tunnel to the node group; The next label Y is the service LSP. So, = F pops label X, and =A1=B0 the label used for working ring tunnel R2cW_I wi= ll be pushed based on the inner label=A1=B1 (i.e. label Y). How could F hav= e the knowledge about the service LSP, its label Y, and its egress node, etc ?

[Huub] the ring-map has to take care of this.

=A1=A4       =   I may have more questions to follow after the above=A1=AD

Regards,

 

Yimin Shen

Juniper Networks



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