В давние-давние времена это зависело не от желания администратора, а от прихоти производителя - как апдейт выпустит,так его и ставили. А исходников тогда не было.
*-gw>sh ver Cisco Internetwork Operating System Software IOS (tm) 3000 Software (IGS-IM-L), Version 11.1(17), RELEASE SOFTWARE (fc1) Copyright (c) 1986-1998 by cisco Systems, Inc. Compiled Tue 27-Jan-98 13:13 by phester Image text-base: 0x03020DD0, data-base: 0x00001000
ROM: System Bootstrap, Version 4.14(6)[fc3], SOFTWARE
*-gw uptime is 4 years, 34 weeks, 6 days, 20 hours, 13 minutes System restarted by power-on at 13:59:10 EEST Sat Jun 15 2002 System image file is "igs-im-l.111-17rmon.bin", booted via flash
cisco 2500 (68030) processor (revision A) with 4096K/2048K bytes of memory. Processor board ID *, with hardware revision 00000000 Bridging software. X.25 software, Version 2.0, NET2, BFE and GOSIP compliant. Cisco-ET Extended Temperature platform. 1 Ethernet/IEEE 802.3 interface. 2 Serial network interfaces. 32K bytes of non-volatile configuration memory. 4096K bytes of processor board System flash (Read ONLY)
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:)))))))
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Вот так..
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Cisco Internetwork Operating System Software
IOS (tm) 3000 Software (IGS-IM-L), Version 11.1(17), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1998 by cisco Systems, Inc.
Compiled Tue 27-Jan-98 13:13 by phester
Image text-base: 0x03020DD0, data-base: 0x00001000
ROM: System Bootstrap, Version 4.14(6)[fc3], SOFTWARE
*-gw uptime is 4 years, 34 weeks, 6 days, 20 hours, 13 minutes
System restarted by power-on at 13:59:10 EEST Sat Jun 15 2002
System image file is "igs-im-l.111-17rmon.bin", booted via flash
cisco 2500 (68030) processor (revision A) with 4096K/2048K bytes of memory.
Processor board ID *, with hardware revision 00000000
Bridging software.
X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.
Cisco-ET Extended Temperature platform.
1 Ethernet/IEEE 802.3 interface.
2 Serial network interfaces.
32K bytes of non-volatile configuration memory.
4096K bytes of processor board System flash (Read ONLY)
Configuration register is 0x2102
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