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Re: [mpls] LDP Color LSP - downstream unsolicited and on-demand

Ina Minei <ina@juniper.net> Fri, 02 August 2013 09:59 UTC

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From: Ina Minei <ina@juniper.net>
To: "Santiago Alvarez (saalvare)" <saalvare@cisco.com>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: LDP Color LSP - downstream unsolicited and on-demand
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Date: Fri, 02 Aug 2013 09:59:22 +0000
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Subject: Re: [mpls] LDP Color LSP - downstream unsolicited and on-demand
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Thank you for pointing out the text. 

A few questions on the draft:
- can you explain how the egress would know the colors it should advertise? (I am assuming you are assuming additional information from a different protocol, it would be good for the document to explicitly state this is the case and provide a use case)
- What kind of guarantees can the head end have regarding the path established, given that it has no indication whether all routers in the path support color matches or were able to select a path conforming to the colors (basically only part of the path conforms to colors) and how does this relate to the use cases solved. To give an extreme example, if c1 is "low latency" and c2 is "high latency", the egress signals for C1 but at node X only color c2 is available, given the requirement in section 5 for "at least one default path", what can be said of the resulting path at the head end (apart from the fact that a path exists). Does this mean that the default path has to be defined per color?
- the document does not specify the lsping processing rules, in particular at nodes where a particular color does not exist. Can you explain?

Thanks,

Ina 


-----Original Message-----
From: mpls-bounces@ietf.org [mailto:mpls-bounces@ietf.org] On Behalf Of Santiago Alvarez (saalvare)
Sent: Friday, August 02, 2013 1:38 AM
To: mpls@ietf.org
Cc: Santiago Alvarez (saalvare)
Subject: [mpls] LDP Color LSP - downstream unsolicited and on-demand

If I understood the question correctly, Ina asked why draft-alvarez-mpls-ldp-color-lsp-00 was only considering downstream unsolicited label allocation.  As mentioned on the mic, draft focuses on downstream label allocation, both unsolicited and on-demand.  Here's a snippet from the current doc:

" An egress LSR MAY include the Color List TLV in a Label Mapping
   Message if using Downstream Unsolicited mode.  An LSR may include the
   TLV in Label Request Messages if using Downstream on Demand mode.   "

Any further feedback appreciated. Thanks.

SA
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