[L2tpext] IETF 61 Working Group Minutes
"W. Mark Townsley" <townsley@cisco.com> Wed, 17 November 2004 15:00 UTC
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Date: Wed, 17 Nov 2004 09:52:04 -0500
From: "W. Mark Townsley" <townsley@cisco.com>
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Subject: [L2tpext] IETF 61 Working Group Minutes
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Many thanks to Sam Henderson, Dennis Frett, and David Hunter who all sent in notes from the l2tpext meeting. Following is my consolidation of the three. Please respond with any clarifications, additions, subtractions, etc. I will send these to the secretariat for archiving no earlier than Dec 1, and no later than Dec 10. Thanks, - Mark Agenda Bashing and Status, Mark Townsley Last met, July 2003, Vienna. New RFCs Since: RFC3817, L2TP active discovery relay for PPP over Ethernet RFC3931, L2TPv3 (in the RFC editor's queue) Draft-ietf-l2tpext-mcast-05.txt approved for publication WG Drafts: L2VPN Extensions for L2TP draft-ietf-l2tpext-l2vpn-02.txt Frame-Relay over L2TPv3 draft-ietf-l2tpext-pwe3-fr-04.txt HDLC Frames over L2TPv3 draft-ietf-l2tpext-pwe3-hdlc-04.txt ATM Pseudo-Wire Extensions for L2TP draft-ietf-l2tpext-pwe3-atm-02.txt Transport of Ethernet Frames over L2TPv3 draft-ietf-l2tpext-pwe3-ethernet-02.txt (-02 didn’t get posted for some unknown reason) Fail Over extensions for L2TP "failover" draft-ietf-l2tpext-failover-04.txt Expired/Stalled Drafts L2TP Session Information "sesinfo" draft-ietf-l2tpext-sesinfo-04.txt L2TP Tunnel Switching draft-ietf-l2tpext-tunnel-switching-04.txt draft-ietf-l2tpext-tunnel-switching-04.txt Potential WG Drafts RADIUS & L2TP Extended NAS-Port AVPs draft-nmcgill-l2tp-radius-ext-nas-port-02.txt L2TP Call Information Messages draft-mistretta-l2tp-infomsg-01.txt L2TPv3 Graceful Restart draft-galtzur-l2tpext-gr-02.txt Layer Two Tunneling Protocol - Setup of TDM Pseudowires draft-galtzur-l2tpext-tdm-01.txt No comments from the audience on status or agenda. TDM Setup, Sasha Vainshtein draft-galtzur-l2tpext-tdm-01.txt -------------------------------- TDM PW requires exchange of - AC bit rate - packet payload size - Usage of RTP header - AC trunk type - prevent E1 from being connected to T1 New AVPs - TDM PW AVP flags: rtp header, fragmentation of TDM multiflags - Discussion on a defined flag that is no longer used. - Comments about providing a failure reason when tearing down link due to parameter mismatch. Sasha agreed to look into providing this. - Proposal: Accept this draft as a WG document & solicit discussion on the mailing list. No substantive objections raised. Tom Mistretta - RADIUS-EXT/infoMsg/sesinfo ------------------------------------------ Propose to consolidate all the NAS info drafts to Radius draft. - LAC - LNS info exchange msgs - Three drafts going to three separate directions -- radext, sesinfo and infomsg - Want to propagate NAS-port info from one end of network to other, for use in service provider billing -- - Central problem that 32-bit "physical channel ID" is not a number people can use; - Currently have many different proprietary ways to do this; - Also people want just to send simple debug msgs between LAC and LNS; - There are resulting tunnel-switching complications to tackle as well SESINFO draft - Infomsg talked about debug - Propose to let infomsg and sesinfo expire - Continue with the Radius draft Tom Narten: Need to get radext group signoff for RADIUS extension; as AD I will not go to Last Call until they have reviewed it; shouldn't have to present in Radext, just send to their group; Mark mentioned Glen Zorn would be good reviewer -- knows both L2TP and RADIUS Tom Mistretta - Tunnel Switching -------------------------------- Propose to update tunnel-switching draft and send out early next year. Potentially remove loop detection - not much concern in audience about tunnel switching loops. Congestion Problem: Congestion on tunnel switch aggregator (TSA) is not propagated back to the LAC; LAC might be tring to do load balancing, but not even know there is a TSA out there; only solution we know of is propagating far too much info back; we believe this can be solved in a standards approach simply by having a new message ("resources unavailable, temporary condition" message -- as have elsewhere) MarkT: PWE3 also tackling the "PW-switching" problem. Need to reconcile this with PWE3 and L2TPv3 Try to deliver new draft to mailing list by early next year. Sasha - L2TP Graceful Restart Overview -------------------------------------- draft-galtzur-l2tpext-gr-02.txt Objective: - Restart the control plane without affecting the forwarding state. - Customer traffic should not be disturbed. How: - behavior is split between the two peers - peer of the restarting LCCE detects loss of control connection - postpones breaking the associated sessions. Protocol changes: Two new AVPs. New session state. No new security issues. Same security methods as in the native l2tpv3. Partial graceful restart support possible. (Greg Daley) Concern about security in allowing forwarding state to remain and potentially be extended for an amount of time after the control connection goes down. Ans: Forwarding state is kept only for finite amount of time after the control connection goes down. If a new control connection is not authenticated in a given time - the forwarding state is removed. L2TPv3 Failover, Tom Mistretta, Paul Howard ------------------------------------------- draft-ietf-l2tpext-failover-04.txt Each L2TP peer has configured and dynamic stateful info Need protocol ext for reconciling states between peers Re-sync 3 phases; pre-failover during control channel setup recovery synchronization Sam Henderson galtzur-l2tpext-gr vs. ietf-l2tpext-failover -------------------------------------------------------------- - Galtzur establishes whole new control connection after failover - Failover draft establishes new temporary control chan to reset/resync original control channel; - After recovery time, query peer for sessions that appear to be stale - Combining these: - Need recovery tunnel concept to prevent updating data plane with new tunnel ID for v2 - Allow normal processing of ICRQs with GR AVP and receiving traffic to refresh - End up with limiations of one and complexities of the other - So now it is easier to implement both drafts separately Mark: So far it seems like everyone wants 2 drafts _______________________________________________ L2tpext mailing list L2tpext@ietf.org https://www1.ietf.org/mailman/listinfo/l2tpext
- [L2tpext] IETF 61 Working Group Minutes W. Mark Townsley