The router tries to recover from OCXO failure by performing switchover of RSPs in the case of Dual RSPs.
Use the show platform command to detect whether your router has standalone RSP or dual RSPs.
Here, is an example of command output for dual RSP:
Router#show platform
Node Type State Config state
--------------------------------------------------------------------------------
0/RSP0/CPU0 A9K-RSP880-SE(Active) IOS XR RUN NSHUT
0/RSP1/CPU0 A9K-RSP880-SE(Standby) IOS XR RUN NSHUT
0/FT0 ASR-9904-FAN OPERATIONAL NSHUT
0/0 A9K-48X10GE-1G-TR SW_INACTIVE NSHUT
0/1/CPU0 A9K-4X100GE-SE IOS XR RUN NSHUT
0/PT0 A9K-AC-PEM-V2 OPERATIONAL NSHUT
Router#
Here, is an example of command output for standalone RSP:
Router#show platform
Node Type State Config state
--------------------------------------------------------------------------------
0/RSP0/CPU0 A9K-RSP880-SE (Active) IOS XR RUN NSHUT
0/FT0 ASR-9901-FAN OPERATIONAL NSHUT
0/FT1 ASR-9901-FAN OPERATIONAL NSHUT
0/FT2 ASR-9901-FAN OPERATIONAL NSHUT
0/0/CPU0 ASR9901-LC IOS XR RUN NSHUT
0/PT0 A9K-AC-PEM OPERATIONAL NSHUT
Router#
Dual RSPs
When the router has High Availabilty (HA) RSPs or Dual RSPs, there are two RSPs: RSP0 and RSP1. One of them is active RSP
and other is standby RSP. When OCXO fails, you can see a PFM alarm on the router console. The router performs RSP switchover
to recover from the OCXO failure and to maintain the timing accuracy. During switchover, the active RSP becomes the standby
RSP and the standby RSP takes the role of active RSP. RSP switchover takes maximum 10 seconds.
However, you must contact Cisco Support team.
To track the fatal PFM alarms generated, the router maintains OBFL logs. .
Use the Router# show reboot history location 0/RSP0/CPU0 command to view the OBFL logs.
Here, is a sample output of reboot history.
No Time Cause code reason
01 Thu Nov 11 13:54:54 2021 0x2c00001b Cause: Card reset requested by: Process ID: 102448 (dao_tmp), Target node: 0/RSP0/CPU0, CondID: 637, Fault Reason: RSP PLL error log: Local oscillator clock output is unstable, Reloading the board.
Process: pfm_node_rp
02 Fri Nov 12 04:26:11 2021 0x0400004f Cause: MBI-HELLO reloading node on receiving reload notification
Process: mbi-hello
Standalone RSP
When only one RSP is in use, you can only see the PFM alarm on the router console. This alarm indicates that OCXO failure
has occurred and you must contact Cisco Support team.