Subject: Re: [PCN] New technical point regarding loss of signalling

From: "Georgios Karagiannis" <[email-masked]>
Date: Wed, 1 Sep 2010 16:49:23 +0200

Hi Tom

You are right on the point of expanding the provided text, associated with
loss of signaling, a bit to consider the cases of centralized and
decentralized Decision Point separately. 
Your proposal is fine for me!

Best regards,
Georgios

> -----Original Message-----
> From: [email-masked] [mailto:[email-masked]] On 
> Behalf Of Tom Taylor
> Sent: donderdag 26 augustus 2010 17:54
> To: pcn
> Subject: [PCN] New technical point regarding loss of signalling
> 
> The current text regarding loss of signalling between the 
> Decision Point and PCN-egress-node reads as follows:
> 
> "If the Decision Point fails to receive reports from a given 
> PCN-egress-node for a configurable interval T-fail, it SHOULD 
> cease to admit flows to that aggregate and raise an alarm to 
> management."
> 
> This needs to be expanded a bit to consider the cases of 
> centralized and decentralized Decision Point separately. For 
> the Decision Point collocated with a PCN-ingress-node, there 
> is just one ingress-egress-aggregate involved, as the text 
> implies. However, for a centralized Decision Point, the text 
> should say that no more flows are admitted to any 
> ingress-egress-aggregate passing through the PCN-egress-node 
> concerned.
> 
> For thoroughness, signalling failure between the Decision 
> Point and a PCN-ingress-node should be covered, but the 
> situation is rather peculiar. The PCN-ingress-node is still 
> forwarding flows, since otherwise flow termination wouldn't 
> be required. But it is not responding to signalling. I guess 
> the only action is logging and alarming, since the Decision 
> Point can't do anything else if signalling isn't working.
> 
> Tom Taylor
> _______________________________________________
> PCN mailing list
> [email-masked]
> https://www.ietf.org/mailman/listinfo/pcn
>