Re: [AVT] WGLC comments on draft-ietf-avt-ports-for-ucast-mcast-rtp-11: Part 7 Persistent Errors
Magnus Westerlund <magnus.westerlund@ericsson.com> Mon, 17 January 2011 10:17 UTC
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Date: Mon, 17 Jan 2011 11:19:47 +0100
From: Magnus Westerlund <magnus.westerlund@ericsson.com>
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To: "Ali C. Begen (abegen)" <abegen@cisco.com>
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Cc: "draft-ietf-avt-ports-for-ucast-mcast-rtp@tools.ietf.org" <draft-ietf-avt-ports-for-ucast-mcast-rtp@tools.ietf.org>, IETF AVT WG <avt@ietf.org>
Subject: Re: [AVT] WGLC comments on draft-ietf-avt-ports-for-ucast-mcast-rtp-11: Part 7 Persistent Errors
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Ali C. Begen (abegen) skrev 2011-01-14 19:34: > > >> -----Original Message----- >> From: Magnus Westerlund [mailto:magnus.westerlund@ericsson.com] >> Sent: Friday, January 14, 2011 6:14 PM >> To: IETF AVT WG; draft-ietf-avt-ports-for-ucast-mcast-rtp@tools.ietf.org >> Subject: WGLC comments on draft-ietf-avt-ports-for-ucast-mcast-rtp-11: Part 7 Persistent Errors >> >> Hi, >> >> This is a continuation of the issue 15A from the 08 review. >> >> The issue is when a client should consider an error to be persistent, or >> at least not short time temporarily or resolvable. If a client continues >> to get Mapping responses with errors after having tried several times. >> Maybe it should do exponential back-off. Maybe it should update its >> session description. Similar for Verification Requests. >> >> Some recommendation about such behavior I think has clear benefit and >> reduced uncertainty in behavior by clients. > > This sounds like a good suggestion. How about adding the following to the end of section 6: > > If a client receives a Port Mapping Response message with an invalid Token (i.e., the relative expiration time is set to zero) two or more times for a particular Port Mapping Request message, or the client receives a Token Verification Failure message two or more times for the same Token Verification Request message, the client SHOULD do the following: > 1- Check whether the session description has been updated or not. If it was updated, act according to the new session description. > 2- Exponentially back-off for the third and subsequent attempts. > > Exponential back-off does not apply when the client sends a Port Mapping Request or Token Verification Request message to a new address and/or port. > > Let me know if this text is good or you wanna modify it. Good enough I think. Cheers Magnus Westerlund ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ----------------------------------------------------------------------
- [AVT] WGLC comments on draft-ietf-avt-ports-for-u… Magnus Westerlund
- Re: [AVT] WGLC comments on draft-ietf-avt-ports-f… Ali C. Begen (abegen)
- Re: [AVT] WGLC comments on draft-ietf-avt-ports-f… Magnus Westerlund