We run 12.0 (23) S2 on some 10000s with RPR Plus:
Router#sh ver
Cisco Internetwork Operating System Software
IOS (tm) 10000 Software (C10K-P10-M), Version 12.0(23)S2, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)
TAC Support:
Copyright (c) 1986-2003 by cisco Systems, Inc.
Compiled Wed 12-Feb-03 15:43 by nmasa
Image text-base: 0x600109B0, data-base: 0x61600000
ROM: System Bootstrap, Version 12.0(9r)SL2, RELEASE SOFTWARE (fc1)
BOOTLDR: 10000 Software (C10K-P10-M), Version 12.0(23)S2, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)
Router uptime is 16 weeks, 23 hours, 33 minutes
System returned to ROM by reload at 09:26:16 EDT Fri Oct 3 2003
System restarted at 09:28:37 EDT Fri Oct 3 2003
System image file is "disk0:c10k-p10-mz.120-23.S2.bin"
cisco C10008 (PRE1-RP) processor with 458751K/65536K bytes of memory.
R7000 CPU at 262Mhz, Implementation 39, Rev 2.1, 256KB L2, 2048KB L3 Cache
Backplane version 1.0, 8 slot
Last reset from register reset
Toaster processor tmc0 is running.
Toaster processor tmc1 is running.
1 six-port OC3 POS controller (6 POS)
1 Ethernet/IEEE 802.3 interface(s)
17 FastEthernet/IEEE 802.3 interface(s)
3 GigabitEthernet/IEEE 802.3 interface(s)
4 ATM network interface(s)
6 Packet over SONET network interface(s)
6 Channelized T3 port(s)
509K bytes of non-volatile configuration memory.
47040K bytes of ATA PCMCIA card at slot 0 (Sector size 512 bytes).
32768K bytes of Flash internal SIMM (Sector size 256KB).
Standby is up
Standby has 524288K bytes of memory.
Configuration register is 0x102
Router#sh redun
Router#sh redundancy
PRE A (This PRE) : Active
PRE B : Standby
Operating mode : RPR Plus
Uptime since this PRE became active from reload : 16 weeks, 23 hours, 47 minutes
Standby failures since this PRE active : 0
The standby PRE has been up for : 16 weeks, 23 hours, 45 minutes
Standby PRE information....
Standby is up.
Standby has 524288K bytes of memory.
Standby BOOT variable = disk0:c10k-p10-mz.120-23.S2.bin,1;
Standby CONFIG_FILE variable =
Standby BOOTLDR variable =
Standby Configuration register is 0x102
Standby version:
Cisco Internetwork Operating System Software
IOS (tm) 10000 Software (C10K-P10-M), Version 12.0(23)S2, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)
TAC Support:
Copyright (c) 1986-2003 by cisco Systems, Inc.
Compiled Wed 12-Feb-03 15:43 by nmasa
Active version:
Cisco Internetwork Operating System Software
IOS (tm) 10000 Software (C10K-P10-M), Version 12.0(23)S2, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)
TAC Support:
Copyright (c) 1986-2003 by cisco Systems, Inc.
Compiled Wed 12-Feb-03 15:43 by nmasa
Router#