Deterministic Networking Application in Ring Topologies

1. Deterministic Networking Application in Ring Topologies draft-jiang-detnet-ring-00 Yuanlong Jiang (jiangyuanlong@huawei.com) Norman Finn (norman.finn@mail01.huawei.com) Jeong-dong Ryoo (ryoo@etri.re.kr) Balazs Varga (balazs.a.varga@ericsson.com) Liang Geng (gengliang@chinamobile.com) 101st IETF - London

2. Backgrounds • Deterministic delay and high availability for multicast services • I-D.ietf-detnet-use-cases lists some use cases • Multicast /Broadcast is also a key enabler for some 5G use cases (5G-XCAST in 5GPPP): 101st IETF - London

3. Backgrounds (cont’) • Ring topologies have been very popular and widely deployed in access/aggregation networks N31 N21 N22 N32 N13 N14 N23 N12 N15 N33 N24 N11 N41 N16 N42 N19 N17 N18 N43 N51 N52 N44 N64 N53 N56 N71 N63 N61 N54 N72 N55 N73 N62 N75 N74 101st IETF - London

4. Multicast in a ring Root P2MP Multicast Service Leaf Leaf Leaf 101st IETF - London

5. Multicast in a ring P2MP Multicast Before wrap-up After Wrap-up 101st IETF - London

6. LSP2 PW Seq# LSP1 PW Seq# Multicast ring in Detnet Root Replicated P2MP Multicast Service Terminated Leaf Forwarding & Eliminated Leaf Leaf 101st IETF - London

7. Interconnection of Rings P2MP Multicast Service Root Replicated Terminated Replicated Terminated & Eliminated Leaf Leaf Leaf Leaf Leaf 101st IETF - London

8. Discussions • Multicast in a ring is efficient • At most 2 copies of packets are sent, one for CW, and one for CCW • Evolvable with Detnet • This solution is almost gratuitous for Detnet, both unicast and multicast can use the same mechanism (replication & elimination) • Issues • Asymmetric path in a ring has influences on elimination, maybe a constraint on maximum packet rate of a Detnet service 101st IETF - London

9. Next Step • The authors would like to request more WG feedbacks 101st IETF - London

10. Thank You 101st IETF - London