High Available Synchronization with IEEE 802.1AS bt
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1 High Available Synchronization with IEEE 802.1AS bt IEEE 802 Meeting - TSN-TG Orlando / USA Franz-Josef Goetz, Siemens AG
2 Structure of this Presentation 1. Methods in IEEE 1588 v2 and IEEE 802.1AS to establish the Sync Path 2. Further Requirements on IEEE802.1AS Gen 2 3. Methods to meet the Requirements for High Available and High Accurate Synchronization 4. Proposals how a Sync-Relay of a Time Aware System can distinguish multiple Sync Path 5. Proposal for Distributing Synchronization Information with ISIS-SPB Page
3 Structure of this Presentation 1. Methods in IEEE 1588 v2 and IEEE 802.1AS to establish the Sync Path 2. Further Requirements on IEEE802.1AS Gen 2 3. Methods to meet the Requirements for High Available and High Accurate Synchronization 4. Proposals how a Sync-Relay of a Time Aware System can distinguish multiple Sync Path 5. Proposal for Distributing Synchronization Information with ISIS-SPB Page
4 Method how IEEE 1588 v2 establish the Sync Path Today: Two Methods already used to established a sync path IEEE 1588v2: (PTPv2 Transparent Clocks, TC) Announce, Sync and FollowUp messages are multicast frames => Announce, Sync and FollowUp messages are forwarded by the MAC-Relay of a TC in typical implementations When network consist of ordinary clocks (OC) and transparent clock (TC) Today: typical usage in industrial networks Port roles for TC are established by RSTP this means that when receiving a Sync message, the ingress port is the slave-port and the egress port is the master-port No guaranteed path for sync message by network reconfiguration Announce, Sync and FollowUp are forwarded by MAC-Relay entity In typical implementation of TC 1588v2 Network must provide a mechanism to prevent loops e.g. RSTP Redundant disjoint path for redundant sync messages are not supported Page
5 Methods in IEEE 1588 v2 and IEEE 802.1AS to establish the Sync Path IEEE 802.1AS Gen 1 (gptp) Announce, Sync and FollowUp messages are peer-2-peer frames => no flooding of announce messages and overload situations => exchange of source address to be standard conform manipulate correction field in payload of sync message at each hop => Sync- and FollowUp messages are forwarded by Sync-Relay (higher layer entity) Network consists of time aware systems which has to support the BMC end stations, bridges and routers Sync tree is established by BMCA (like boundary clocks BC) which assigns fix port roles slave port or master port But: Forwarding of sync and FollowUp frames is based on a Sync-Relay independent of bridge MAC relay The methods for correction residence time of sync message within a time aware system are the same as specified for transparent clock (TC) By using BMCA gptp has specified it s own network independent loop prevention mechanism Redundant disjoint path for redundant sync messages are not supported Page
6 Structure of this Presentation 1. Methods in IEEE 1588 v2 and IEEE 802.1AS to establish the Sync Path 2. Further Requirements on IEEE802.1AS Gen 2 3. Methods to meet the Requirements for High Available and High Accurate Synchronization 4. Proposals how a Sync-Relay of a Time Aware System can distinguish multiple Sync Path 5. Proposal for Distributing Synchronization Information with ISIS-SPB Page
7 Further Requirements on IEEE802.1 AS bt Two Time Scales (Universal Time & Working Clock) for industrial application High accuracy and availability Redundant disjoint sync path Simultaneously transmission redundant sync messages over redundant path (e.g. path A and path B) =>Receiving redundant sync messages Better sync quality using redundant sync message (e.g. from path A and path B) Zero switchover time by single point of failure to guarantee accuracy (using low quality oscillators in rough environment) Maintenance and surveillance Grandmaster (GM) distributes redundant sync messages over redundant path to synchronize end stations (S) GM S S S Cold- or hot-stand-by grandmaster Sync Path A Sync Path B Proposed method to fulfill these further requirements: Knowledge about physical topology, link state information and a appropriate routing algorithm is required to establish sync path IEEE has introduced ISIS-SPB (intermediate to intermediate system shortest path bridging) as link state protocol S S Page
8 Structure of this Presentation 1. Methods in IEEE 1588 v2 and IEEE 802.1AS to establish the Sync Path 2. Further Requirements on IEEE802.1AS Gen 2 3. Methods to meet the Requirements for High Available and High Accurate Synchronization 4. Proposals how a Sync-Relay of a Time Aware System can distinguish multiple Sync Path 5. Proposal for Distributing Synchronization Information with ISIS-SPB Page
9 Methods to meet the requirements for high available and high accurate Synchronization Page
10 Methods to meet the requirements for high available and high accurate Synchronization Page
11 Structure of this Presentation 1. Methods in IEEE 1588 v2 and IEEE 802.1AS to establish the Sync Path 2. Further Requirements on IEEE802.1AS Gen 2 3. Methods to meet the Requirements for High Available and High Accurate Synchronization 4. Proposals how a Sync-Relay of a Time Aware System can distinguish multiple Sync Path 5. Proposal for Distributing Synchronization Information with ISIS-SPB Page
12 Proposals how a Sync-Relay of a Time Aware System can distinguish multiple Sync Path 1. For each sync path a unique destination MAC address Problem: A list of multicast MAC address are required 2. Tagged sync messages (VLAN ID per sync path) Problem: Peer-To-Peer messages are not be tagged 3. Introduce Path ID Problem: Not in the IEEE 1588 & IEEE AS standard Proposal: Sync Message Header DA SA ET TransporSpecific MsgID PTPVersion MsgLength DomainID Flags Octet 1 4 bits Length 4 bits 2 Page
13 Proposals how a Sync-Relay of a Time Aware System can distinguish multiple Sync Path The table gives a high level overview about the information we propose to use for the purpose of forwarding sync messages over redundant path: Information Time Scale Domain ID Path ID MAC Address Purpose Universal time (traceable time) Working clock (free running, none traceable time) One time scale within one sync domain Sync and Sync frames shall be transmitted on independent paths Path ID s are used to mark redundant path (Path A, Path B, ) Path ID s are used to mark grandmaster / time source (e.g. GM1 / Path A, GM1 / Path B, GM2 / Path A, GM2 / Path B, ) All Sync frames have the same destination MAC Address. Forwarding decision in Sync-Relay for the Sync & FollowUp message is based on Destination MAC Address, Domains ID & Path ID Page
14 Structure of this Presentation 1. Methods in IEEE 1588 v2 and IEEE 802.1AS to establish the Sync Path 2. Further Requirements on IEEE802.1AS Gen 2 3. Methods to meet the Requirements for High Available and High Accurate Synchronization 4. Proposals how a Sync-Relay of a Time Aware System can distinguish multiple Sync Path 5. Proposal for Distributing Synchronization Information with ISIS-SPB Page
15 How can ISIS-SPB & gptp work together? Proposal: The communication path for sync messages shall be established by ISIS-SPB Which information are needed from ISIS-SPB to pre-configure sync path? Topology for Synchronization Which end stations and bridges support gptp (are time aware system)? General Configuration Which time scale should be synchronized (universal time, working clock, )? Which Domain ID is assigned to a time scale? Is high availability required? How many hot- or cold stand-by grandmaster? How many redundant path for Sync messages? Synchronization end-to-end connectivity for ISIS-SPB Which end stations and bridges supports gptp? Which time aware systems are grandmaster capable? Which priority has a grandmaster capable time aware systems? Which time quality has a grandmaster capable time aware systems? Which time aware systems shall be synchronized? Page
16 ISIS-SPB for SYNC based on gptp can cross L3 Router because all messages are peer-to-peer messages Page
17 Proposal for Distributing Synchronization Information with ISIS-SPB for SYNC New Sync Instance Sub-TLV in ISIS Link-State-PDU Information for layer 2 sync routing Time Scale (e.g. universal time, working clock) Sync Domain ID (for one time scale) Path ID: path A, path B (optinal) Number of Hot-stand-by or cold-stand-by GM (typical one) New Sync Metric Sub-TLV in ISIS Link-State-PDU gptp port information.1as or PTP Version x capable New Sync Announce Sub-TLV in Link-State-PDU Information for BMCA to elect primary GM, cold- or hot-stand-by GM, slaves ClockIdentity Priorit< Page
18 Proposal for ISIS-SPB for SYNC New Sync Instance Sub-TLV in Link-State-PDU Page
19 Proposal for ISIS-SPB for SYNC New Sync Link Metric Sub-TLV in Link-State-PDU IS-IS Link State PDU Remaining Lifetime Source Node ID LSP-ID Sequence Nr Sync Link Metric TLV Type Length AS Capable Octet Length Page
20 Proposal for ISIS-SPB for SYNC New Sync Announce Sub-TLV in Link-State-PDU Page
21 Next Steps? Thank you for your attention! Questions? Page
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