IE Backbone router

[azeemu]

Hi Guys....
I am unable to configure IPv6 config in BB routers.....I need to upgrade IOS (but which one ? ) .... Here is the sh ver of 3 BB routers.... Please help ....
Thanks
BB1
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Cisco Internetwork Operating System Software
IOS (tm) 2500 Software (C2500-IO-L), Version 12.0(17), RELEASE SOFTWARE (fc1)
Copyright © 1986-2001 by cisco Systems, Inc.
Compiled Mon 16-Apr-01 20:34 by nmasa
Image text-base: 0x03032830, data-base: 0x00001000
ROM: System Bootstrap, Version 11.0(10c), SOFTWARE
BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c), RELEASE SOFTWARE (fc1)
BB1 uptime is 2 hours, 18 minutes
System restarted by power-on
System image file is "flash:c2500-io-l.120-17.bin"
cisco 2500 (68030) processor (revision L) with 14336K/2048K bytes of memory.
Processor board ID 06148947, with hardware revision 00000000
Bridging software.
X.25 software, Version 3.0.0.
1 Token Ring/IEEE 802.5 interface(s)
2 Serial network interface(s)
32K bytes of non-volatile configuration memory.
16384K bytes of processor board System flash (Read ONLY)
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BB2
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Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IS-M), Version 12.2(12m), RELEASE SOFTWARE (fc1)
Copyright © 1986-2005 by cisco Systems, Inc.
Compiled Wed 17-Aug-05 07:31 by tinhuang
Image text-base: 0x8000808C, data-base: 0x810D0D94
ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)
BB2 uptime is 6 minutes
System returned to ROM by power-on
System image file is "flash:c2600-is-mz.122-12m.bin"
cisco 2610 (MPC860) processor (revision 0x203) with 45056K/4096K bytes of memory.
Processor board ID JAD045258O9 (3236113300)
M860 processor: part number 0, mask 49
Bridging software.
X.25 software, Version 3.0.0.
Basic Rate ISDN software, Version 1.1.
1 Ethernet/IEEE 802.3 interface(s)
1 ISDN Basic Rate interface(s)
32K bytes of non-volatile configuration memory.
16384K bytes of processor board System flash (Read/Write)

BB3
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Cisco Internetwork Operating System Software
IOS (tm) 2500 Software (C2500-IS56I-L), Version 12.0(10), RELEASE SOFTWARE (fc1)
Copyright © 1986-2000 by cisco Systems, Inc.
Compiled Tue 21-Mar-00 02:35 by phanguye
Image text-base: 0x03042500, data-base: 0x00001000
ROM: System Bootstrap, Version 11.0(10c), SOFTWARE
BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c), RELEASE SOFTWARE (fc1)
BB3 uptime is 2 hours, 13 minutes
System restarted by power-on
System image file is "flash:c2500-is56i-l.120-10.bin"
cisco 2500 (68030) processor (revision N) with 14336K/2048K bytes of memory.
Processor board ID 06098795, with hardware revision 00000000
Bridging software.
X.25 software, Version 3.0.0.
1 Ethernet/IEEE 802.3 interface(s)
2 Serial network interface(s)
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read ONLY)
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[tranmyphuc]

hi!!!
Try newer ios : Release 12.2T (minimizer)

good luck
have fun !!!