Network topology:
+----+ +-------+
| PC | --> | Cisco |
+----+ +-------+
In troubleshooting a different Cisco device, connecting to an offline Cisco 2801 shows:
- Systemration like toiguration dialo" of 1 00:00:07.7API Get (REBOO88E70,280,0xC-43: PRST-VBL D08.015: PRST-VBL DET Compar<= NTPv4_Drift00:00:08.155: PRST-VBL DET NO REBOOT_COUBOOT_COUNT=48 > prst-dbg=0x300:08.487: PRS- ok returning5
*Mar 1 00::08.659: PRST-VBL DET Lock - ok
*Mar 1 ompare Next - .FFF93EF1
*Ma DET Compare NEBOOT_COUNT=48
*Mar 1 00:0T-VBL DET Compprst-dbg=0x3FF 00:00:09.231: YES prst-dbgfls=33
*Mar 1 00:00:09.299- ok
*Mar 1=33" of size 167088E70,280,09.587: PRST-VB:00:09.751: PRpare Next - NO3EF1
*Mar 1 - NO prst-flss=33 <= prst-f00:00:10.323: tery problem o
*Jan 1 00:0complete - fimpsys
*Jan 1d: null
*Jan 1 00:01:55.15.295: PRST-VBL MED Init comBL MED Init complete - files:01:55.647: PRlized
*Jan 1 00:02:27.839dded: implicit 2 12:00:00.311: PRST-VBL API Get (snmpbo1,0x0-DEFAULT)
Jan 2 12:00:00.363: PRST2:00:00.431: Pache unlock - ok
ttps 2 12:00:00.547: PRS MED Init comps added: http
Jan 2 1anged to: Dis2 12:00:30.711Jan 2 12:00:30.715: %LINK-3-UPDOWN: InteROTO-5-UPDOWN:to down
Jan thernet0/0, che to administr: %LINK-5-CHANy prod_rel_tea0.683: PRST-VBL STD Process :03:50.715: %CRYPTO-6-ISAKMP
Of which Google AI says:
The provided Cisco 2801 router logs indicate a persistent boot loop and potential corruption, likely caused by a hardware issue, corrupted file system, or a faulty configuration file. The garbled output and repeated PRST-VBL initialization suggest the device is failing to load the operating system properly, necessitating a hard power reset, hardware reseating, or bypassing the configuration file, as outlined in Cisco documentation.
As suggested by Google, ctrl-A and then ctrl-B gave a prompt of:
rommon 1 >
However, there’s such a huge lag that it’s not possible to enter commands reasonably. This would indicate a hardware fault?
