Dell Force10 E1200i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 377
Communication between RPMs
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Communication between RPMs E-Series RPMs have three CPUs: Control Processor (CP), Routing Processor 1 (RP1), and Routing Processor 2 (RP2). The CPUs use Fast Ethernet connections to communicate to each other and to the line card CPUs (LP) using Inter-Processor Communication (IPC). The CP monitors the health status of the other processors by sending a heartbeat message. If any CPU fails to acknowledge a consecutive number of heartbeat messages, or the CP itself fails to send heartbeat messages (IPC timeout), the primary RPM requests a failover to the standby RPM, and FTOS displays a message similar to Message 4. C-Series RPMs have one CPU: Control Processor (CP). The CP on the RPM communicates with the LP via IPC. Like the E-Series, the CP monitors the health status of the other processors by sending a heartbeat message. If any CPU fails to acknowledge a consecutive number of heartbeat messages, or the CP itself fails to send heartbeat messages (IPC timeout), the primary RPM requests a failover to the standby RPM, and FTOS displays a message similar to Message 4. Message 4 RPM Failover due to IPC Timeout %RPM1-P:CP %IPC-2-STATUS: target rp2 not responding %RPM0-S:CP %RAM-6-FAILOVER_REQ: RPM failover request from active peer: Auto failover on failure %RPM0-S:CP %RAM-6-ELECTION_ROLE: RPM0 is transitioning to Primary RPM. %RPM0-P:CP %TSM-6-SFM_SWITCHFAB_STATE: Switch Fabric: UP In addition to IPC, the CP on the each RPM sends heartbeat messages to the CP on its peer RPM via a process called Inter-RPM Communication (IRC). If the primary RPM fails to acknowledge a consecutive number of heartbeat messages (IRC timeout), the standby RPM responds by assuming the role of primary RPM, and FTOS displays message similar to message Message 5. Message 5 RPM Failover due to IRC Timeout 20:29:07: %RPM1-S:CP %IRC-4-IRC_WARNLINKDN: Keepalive packet 7 to peer RPM is lost 20:29:07: %RPM1-S:CP %IRC-4-IRC_COMMDOWN: Link to peer RPM is down %RPM1-S:CP %RAM-4-MISSING_HB: Heartbeat lost with peer RPM. Auto failover on heart beat lost. %RPM1-S:CP %RAM-6-ELECTION_ROLE: RPM1 is transitioning to Primary RPM. IPC and IRC timeouts and failover behavior IPC or IRC timeouts can occur because heartbeat messages and acknowledgements are lost or arrive out of sequence, or a software or hardware failure occurs that impacts IPC or IRC. Table 21-2, "Failover Behaviors," in High Availability describes the failover behavior for the possible failure scenarios. Table 21-2. Failover Behaviors Platform c e c e Failover Trigger CP task crash on the primary RPM CP IRC timeout for a non-task crash reason on the primary RPM Failover Behavior The standby RPM detects the IRC time out and initiates failover, and the failed RPM reboots itself after saving a CP application core dump. The standby RPM detects IRC time out and initiates failover. FTOS saves a CP trace log, the CP IPC-related system status, and a CP application core dump. Then the failed RPM reboots itself. High Availability | 377
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1,147
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1,148
-
1,149
-
1,150
-
1,151
-
1,152
-
1,153
-
1,154
-
1,155
-
1,156
-
1,157
-
1,158