RE: [PCN] I-D Action:draft-ietf-pcn-architecture-01.txt

Hi Phil,

your suggestion is allright with me.

I found this sentence in RFC2475:

Ingress nodes must
   condition all other inbound traffic to ensure that the DS codepoints
   are acceptable; packets found to have unacceptable codepoints must
   either be discarded or must have their DS codepoints modified to
   acceptable values before being forwarded.

As PCN may also modify ECN codepoints, the staement must be extended to
cover these too. If only DSCPs are used, no traffic with "congestion 
experienced" marking must pass the ingress node unchanged.

Regards,

Rudiger

|All Editorials - thanks will try to put into next version. 
|
|> 
|> 5.2.  PCN-ingress-node functions
|> 
|> "Packet classify" and "Policing" are only required at the
|> PCN ingress, if no other trusted edge system is doing that.
|> 
|> If there's another edge system doing policing and
|> classification, the PCN ingress node doesn't need
|> to do this. 
|
|true. In the scenarios it says:
|o  If the operator runs both the access network and the core network,
|      one deployment scenario is that only the core network uses PCN
|      admission control but per microflow policing is done at the
|      ingress to the access network and not at the PCN-ingress-node.
|      Note: to aid readability, the rest of this draft assumes that
|      policing is done by the PCN-ingress-nodes.
|
|However, I can add a small comment here & in section 10, as not
|mentioning it is hindering rather than aiding readability!
|
|> 
|> "Note that packet classify/policing is only required by the
|> PCN ingress node, if no other trusted upstream node operates
|> these features."
|> 
|> Further, the section misses a statement on what the ingress
|> node is supposed to do, if a PCN coloured packet is
|> received on an interface where it is not supposed
|> to be received (given the flow is admitted):
|> Ignore and remark or drop?
|
|Good point. Can we just refer to some Diffserv text?
|
|phil
|
|

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