回复:WG last call on draft-ietf-ccamp-mpls-graceful-shutdown

[gaojianhua 38547 <gjhhit@huawei.com>]

 Hi, 
   I have reviewed the draft and have the following comments:

1, In section 4, it is said in second paragraph that:
   "A node where a link or the whole node is being shutdown SHOULD 
   first trigger the IGP updates as described in Section 4.1, 
   introduce a delay to allow network convergence and only then use 
   the signaling mechanism described in Section 4.2."
   
   It means that IGP update process should be ahead of the signaling process when the graceful shutdown is performed. If I understand correctly, the IGP process is used to update the TEDB in the whole network nodes or in PCE,and the synchronized TEDB can be used for new LSP path computation.
   In Section 4.2,the signaling process triggered by 'graceful shutdown' is used for existing LSP, and a PathErr or Notify message should be generated per an existing LSP indicating the related TE resources that will be shoutdown. The head-end node(or border node) of the existing LSP can request to local path computation module or to PCE for a new path with excluded TE resource. From this point of view, the TEDB may not be updated in the me
antime.
   So, IMO,the order of IGP update process and the signaling process may not be limited.

2,In section 4.2.1, it is said in first paragraph that:
 "....If available, and where notify requests were included 
   when the LSPs were initially setup, Notify message (as defined in 
   RFC 3471, RFC 3473) MAY also be used for delivery of this 
   information to the head-end node, border node or PCE."  
   
 It implys that PCE may process RSVP-TE message. If I understand correctly, the PCE can only perform the path computation and can not process signalling message. 
 In my concern, when the 'graceful shutdown' is performed, the PathErr should be send to head-end node or border node, and if necessary, the head-end or border node will act as PCC to request the PCE via PCEP for path computation. 
 
 3, "4.2.2 Graceful Shutdown of a Label Resource " should be "4.2.4 ......"


Thanks
Jianhua Gao
 

----- 原邮件 -----
发件人: Adrian Farrel <adrian@olddog.co.uk>
日期: 星期三, 二月 13日, 2008 下午7:06
主题: WG last call on draft-ietf-ccamp-mpls-graceful-shutdown

> Hi,
> 
> The authors of this draft have been indicating that they thought 
> it was 
> complete for some time. They have now updated the document to fix 
> various 
> formatting nits and minor issues raised in the working group.
> 
> Therefore, this email marks the start of a working group last call on
> http://www.ietf.org/internet-drafts/draft-ietf-ccamp-mpls-graceful-
> shutdown-05.txt 
> This is positioned to be an Informational RFC.
> 
> The last call will end on Wednesday 5th March at 12 noon GMT. 
> Please send 
> your comments to the list.
> 
> Thanks,
> Adrian 
> 
> 
> 
>