01-09-2009 05:35 AM - edited 03-06-2019 03:20 AM
This may be very generic question, but, i have a 4510R with 2 supervisors V , and when i reboot it, is it does not boot in to the ios, i have to type reload .... where do i start with this issue?...the config register, or the supervisors...
currently the config reg is set to 0x2101 using the following ios: cat4000-I9S-M v12.2(25)EWA4 rel. (FC1)
can you point me to documentation on how to configure supervisors?
thank you
rob davis
Solved! Go to Solution.
01-09-2009 11:51 AM
Basically, it is due to config-register, 2101 you are telling the router to load the boot loader but this platform does not have and does not require boot loader. so, as Grant specifies, 2102 should auto load the image when you power cycle it or reload the box.
For further information on bit settings on config-register, watch for the format, I hope you can read the following:
CONFIGURATION REGISTER is stored in NVRAM (or implemented by hardware jumpers), and
specifies some router startup settings. The 16 bit register generally specifies the following:
Bits Meaning Possible Values (binary)
0-3 Boot Sequence 0000 Boot and stay in ROM Monitor
0001 Boot and load RxBoot
0010 Boot and load IOS from Flash
If valid file not found, try to boot from network Others mean same operation but diff. file name
4-5 Reserved
6 NVRAM Ignore 0 Use config in NVRAM at startup
1 Ignore config in NVRAM at startup
7 Banner 0 Don't show Cisco banner at startup
1 Show Cisco banner at startup
8 Break Disable 0 Allow break key usage
1 Disable break key usage
9 Reserved
10 Broadcast Addr 1 Use all 0s as broadcast address at Boot
11-12 Console Speed 00 9600 bps, 01 4800 bps
10 2400 bps, 11 1200 bps
13 Boot Failure 0 If no IOS found on network, just hang
1 If no IOS found on network, load from ROM
14 Broadcast Addr 1 Use subnet broadcast address at Boot
15 Diagnostic Mesg 0 Don't display diagnostic test messages
1 Display diagnostic test messages
2101 = 0010 0001 0000 0001
2102 = 0010 0001 0000 0010
01-09-2009 06:43 AM
Usually a register issue . 0x2101 means it will look for the first image available in bootflash and load that without a boot statement. If you change it to 0x2102 you will have to put in a specific boot statement pointing to the image that you want to use.
01-09-2009 11:51 AM
Basically, it is due to config-register, 2101 you are telling the router to load the boot loader but this platform does not have and does not require boot loader. so, as Grant specifies, 2102 should auto load the image when you power cycle it or reload the box.
For further information on bit settings on config-register, watch for the format, I hope you can read the following:
CONFIGURATION REGISTER is stored in NVRAM (or implemented by hardware jumpers), and
specifies some router startup settings. The 16 bit register generally specifies the following:
Bits Meaning Possible Values (binary)
0-3 Boot Sequence 0000 Boot and stay in ROM Monitor
0001 Boot and load RxBoot
0010 Boot and load IOS from Flash
If valid file not found, try to boot from network Others mean same operation but diff. file name
4-5 Reserved
6 NVRAM Ignore 0 Use config in NVRAM at startup
1 Ignore config in NVRAM at startup
7 Banner 0 Don't show Cisco banner at startup
1 Show Cisco banner at startup
8 Break Disable 0 Allow break key usage
1 Disable break key usage
9 Reserved
10 Broadcast Addr 1 Use all 0s as broadcast address at Boot
11-12 Console Speed 00 9600 bps, 01 4800 bps
10 2400 bps, 11 1200 bps
13 Boot Failure 0 If no IOS found on network, just hang
1 If no IOS found on network, load from ROM
14 Broadcast Addr 1 Use subnet broadcast address at Boot
15 Diagnostic Mesg 0 Don't display diagnostic test messages
1 Display diagnostic test messages
2101 = 0010 0001 0000 0001
2102 = 0010 0001 0000 0010
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: