(Flow Related) DLEP Extensions Lou Berger lberger@labn.net David Wiggins David.Wiggins@ll.mit.edu Bow-Nan Cheng bcheng@ll.mit.edu

Four Drafts DLEP Control Plane Based Pause Extension draft-cheng-manet-dlep-pause-extension-00 a simple control plane based flow control mechanism DLEP DiffServ Aware Credit Windowing Extension draft-cheng-manet-dlep-da-credit-extension-00 a DiffServ aware credit-windowing scheme DLEP Latency Range Extension draft-cheng-manet-dlep-latency-extension-00 reports latency that may be experienced on a link DLEP Multi-Hop Forwarding Extension draft-cheng-manet-dlep-multi-hop-extension-00 reporting and control of multi-hop forwarding 97th IETF

Control Plane Based Pause Extension draft-cheng-manet-dlep-pause-extension-00 A simple control plane based flow control mechanism Modem can send DLEP messages to pause and restart traffic Modem indicates that traffic is to be suppressed Device wide (Per session, using Session Update messages) Per destination (Uses Destination Update messages) May be DSCP specific Pause/resume can identify a group of DSCPs (or all) DSCPs are grouped into logical queues Expected to have narrow applicability Where a simple control plane “xon/xoff” capability is good enough 97th IETF

Pause Extension Mechanisms 1 new Extension Type Control Plane Pause 3 new Data Item Values Queue Parameters Pause / Restart 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Data Item Type | Length | | Num Queues | Scale | Reserved | |Num DSCPs Q0(0)| Queue Size Q0 | | Num DSCPs Q1 | Queue Size Q1 | | Num DSCPs Q2 | Queue Size Q2 | : ... : | Num DSCPs Qn | Queue Size Qn | | DS Field Q1 | DS Field Q1 | DS Field Q1 | DS Field Q2 | : ... | DS Field Qn | 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Data Item Type | Length | | Queue Index | ... : : ... | Queue Index | Queue Size is Informational Open issue: Encoding of {Queue, DSCP list} seems “complex” Is there simpler encoding? 97th IETF

DiffServ Aware Credit Windowing Extension draft-cheng-manet-dlep-da-credit-extension-00 A DiffServ aware credit-windowing scheme More sophisticated flow control, for a wide range of applications For modems that have DSCP related queuing Modem send credit grants and credit increments to a router Per destination, and per DSCP group (queue) Grants set/reset a credit window Router can request credits Routes advertise their credit window status So modems can adapt/reset as need Credits are in bytes and include MAC headers 97th IETF

Credit Windowing Mechanisms 1 new Extension Type – DiffServ Aware Credit Windowing 2 new Messages Credit Control and Credit Control Response Modem  Router – credit increment Router  Modem – status response – credit request 4 new Data Items Queue parameters – Same as pause* DA Credit Grant Sets credit windows in Destination Up/Update/Announce Response messages Increments windows in Credit Control messages DA Credit Window Status DA Credit Request 97th IETF

Latency Range Extension draft-cheng-manet-dlep-latency-extension-00 Reports latency range that may be experienced on a link Builds on Latency Data Item, provides Min and Max Values 1 new Extension Type – Latency Range 1 new Date Item – Latency Range 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Data Item Type | Length | | Maximum Latency : : Maximum Latency | | Minimum Latency : : Minimum Latency | 97th IETF

Multi-Hop Forwarding Extension draft-cheng-manet-dlep-multi-hop-extension-00 Supports reporting and control of multi-hop forwarding Some modem technologies support connectivity to destinations via multi-hop forwarding at the mac layer Modems inform routers when multi-hop forwarding is being used Modems indicate hop count, and ability to change hops Routers MAY use hops in forwarding/routing decisions Routers request modems to change multi-hop forwarding behavior Per device, can request to suppress multi-hop forwarding Per destination, can request or terminate direct connections Can request to restore default behavior Requests can succeed, fail or be rejected Results are reported via hop count 97th IETF

Next Steps Gauge WG interest Solicit feedback Fix typos Aiming towards WG drafts Is there interest in all/some? Solicit feedback Questions / Comments??? Please read and send questions / comments to list Fix typos Publish open source implementation Expected under https://github.com/mit-ll DLEP, these extensions, wireshark dissector 97th IETF