Products & Services

Training & Events

Partner Central

Hierarchical Navigation

HOME
- SUPPORT
  - PRODUCT SUPPORT
    - END-OF-SALE AND END-OF-LIFE PRODUCTS
      - CISCO IOS SOFTWARE RELEASES 12.1 SPECIAL AND EARLY DEPLOYMENTS
        GENERAL INFORMATION
        Release Notes

Cisco IOS Software Releases 12.1 Special and Early Deployments

Release Notes

Some links below may open a new browser window () to display the document you selected.

View documents by topics:

Cisco IOS Software Release 12.1(22)EA7
- Release Notes for the Catalyst 3550 Multilayer Switch, Cisco IOS Release 12.1(22)EA7
  27/Jan/2006
- Release Notes for the Catalyst 2955, Catalyst 2950, and Catalyst 2940 Switches, Cisco IOS Release 12.1(22)EA7.
  01/Feb/2006
Cisco IOS Software Release 12.1(22)EA6
- Release Notes for the Catalyst 3550 Multilayer Switches, Cisco IOS Release 12.1(22)EA6
  26/Oct/2005
- Release Notes for the Catalyst 2955, Catalyst 2950, and Catalyst 2940 Switches, Cisco IOS Release 12.1(22)EA6
  28/Nov/2005
Cisco IOS Software Release 12.1(22)EA5
- Release Notes for the Catalyst 3550 Multilayer Switches, Cisco IOS Release 12.1(22)EA5 and Later
  22/Sep/2005
- Release Notes for the Catalyst 2955, Catalyst 2950, and Catalyst 2940 Switches, Cisco IOS Release 12.1(22)EA5 and Later
  02/Nov/2005
Cisco IOS Software Release 12.1(22)EA4
- Documentation Updates for the Catalyst 2955, 2950, and 2940 Switches, Cisco IOS Release 12.1(22)EA4
  10/Mar/2005
- Release Notes for the Catalyst 3550 Multilayer Switches, Cisco IOS Release 12.1(22)EA4 and Later
  22/Sep/2005
- Release Notes for the Catalyst 2955, Catalyst 2950, and Catalyst 2940 Switches, Cisco IOS Release 12.1(22)EA4 and Later
  02/Nov/2005
Cisco IOS Software Release 12.1(22)EA3
- Release Notes for the Catalyst 3550 Multilayer Switch, Cisco IOS Release 12.1(22)EA3
  28/Jan/2005
- Release Notes for the Catalyst 2955, Catalyst 2950, and Catalyst 2940 Switches, Cisco IOS Release 12.1(22)EA3
  04/Jan/2005
Cisco IOS Software Release 12.1(22)EA2
- Release Notes for the Catalyst 3550 Multilayer Switch, Cisco IOS Release 12.1(22)EA2
  26/Jan/2005
- Release Notes for the Catalyst 2955, Catalyst 2950, and Catalyst 2940 Switches, Cisco IOS Release 12.1(22)EA2
  05/Apr/2005
Cisco IOS Software Release 12.1(19)EC
- Cisco uBR7200 Series - Cisco IOS Release 12.1 EC
  11/May/2005
- Cisco uBR7100 Series - Cisco IOS Release 12.1 EC
  11/May/2005
Cisco IOS Software Release 12.1(12c)EY
- Release Notes for the Catalyst 8510 and the LightStream 1010 Switch for Cisco IOS Release 12.1(12c)EY
  05/Aug/2002
Cisco IOS Software Release 12.1(10)EX
- Release Notes for Cisco 7304 ROMMON Image Release 12.1(12r)EX1
  20/Aug/2002
Cisco IOS Software Release 12.1(7)CX
- Cisco uBR7200 - Cisco IOS Release 12.1 CX
  09/Aug/2001
Cisco IOS Software Release 12.1(5)DB
- Cisco 6400 NSP - Release Notes for Cisco IOS Release 12.1(5)DB1
  16/Feb/2002
- Cisco 6400 NSP � Release Notes for Cisco IOS Release 12.1(5)DB
  02/Apr/2001
- Cisco 6400 NSP � Release Notes for Cisco IOS Release 12.1(5)DB2
  01/Aug/2003
Cisco IOS Software Release 12.1(5)DC
- Cisco 6400 NRP - Cisco IOS Release 12.1(5)DC
  02/Apr/2001
Cisco IOS Software Release 12.1(5)XM
- Cisco AS5800 - Cisco IOS Release 12.1 XM
  25/Feb/2002
- Cisco AS5400 - Cisco IOS Release 12.1 XM
  25/Feb/2002
- Cisco AS5350 - Cisco IOS Release 12.1 XM
  25/Feb/2002
- Cisco AS5300 - Cisco IOS Release 12.1 XM
  25/Feb/2002
- Cisco MC3810 - Cisco IOS Release 12.1 XM
  07/May/2000
- Cisco uBR7200 - Cisco IOS Release 12.1 XM
  13/Feb/2002
- Cisco uBR924 - Cisco IOS Release 12.1 XM
  13/Feb/2002
- Cisco VG200 - Cisco IOS Release 12.1(5) XM7
  13/Feb/2002
- Cisco VG200 - Cisco IOS Release 12.1(5) XM6
  13/Feb/2001
- Cisco 3600 Series - Cisco IOS Release 12.1 XM
  07/May/2001
- Cisco 2600 Series - Cisco IOS Release 12.1 XM
  07/May/2001
- Cisco 2500 Series - Release Notes for Release 12.1(5)XM
  14/Feb/2002
- Cisco 1750 Series - Release Notes for Release 12.1(5)XM
  20/Feb/2002
- Release Notes for Cisco 7200 Series for Cisco IOS Release 12.1 XM
  13/Feb/2002
Cisco IOS Software Release 12.1(5)XR
- Cisco IAD 2420 Series - Cisco IOS Release 12.1 XR
  20/Feb/2001
Cisco IOS Software Release 12.1(5)XU
- Cisco CVA120 Series - Cisco IOS Release 12.1(5)XU
  11/Jun/2001
Cisco IOS Software Release 12.1(5)XV
- Cisco AS5850 - Cisco IOS Release 12.1 XV
  06/Aug/2001
- Cisco AS5800 - Cisco IOS Release 12.1 XV
  23/Apr/2001
Cisco IOS Software Release 12.1(5)YA
- Cisco IGX 8400 Series URM - Cisco IOS Release 12.1 YA
  13/Aug/2001
Cisco IOS Software Release 12.1(5)YB
- Caveat Information for Release 12.1(5)YB4
  29/Jun/2001
- Cisco 3600 Series - Cisco IOS Release 12.1YB
  21/Mar/2001
- Cisco 2600 Series - Cisco IOS Release 12.1 YB
  21/Mar/2001
- Cisco 1750 Series - Release Notes for Release 12.1(5)YB
  27/Feb/2002
- Cisco 800 Series - Release Notes for Release 12.1(5)YB
  20/Feb/2001
Cisco IOS Software Release 12.1(5)YC
- Cisco SOHO Series - Release Notes for Release 12.1(5)YC
  26/Mar/2002
- Cisco 800 Series - Release Notes for Release 12.1(5)YC
  26/Mar/2002
Cisco IOS Software Release 12.1(5)YD
- Cisco IAD2420 Series - Cisco IOS Release 12.1 YD
  20/Jan/2002
- Cisco 3600 Series - Cisco IOS Release 12.1 YD
  20/Jan/2002
- Cisco 2600 Series - Cisco IOS Release 12.1 YD
  20/Jan/2002
Cisco IOS Software Release 12.1(5)YE
- Release Notes for Cisco Catalyst 4224 Access Gateway Switch for Cisco IOS Release 12.1(5)YE5
  04/Apr/2002
- Release Notes for Cisco Catalyst 4224 Access Gateway Switch for Cisco IOS Release 12.1(5)YE4
  07/Nov/2001
- Release Notes for Cisco Catalyst 4224 Access Gateway Switch for Cisco IOS Release 12.1(5)YE3
  11/Oct/2001
- Release Notes for Cisco Catalyst 4224 Access Gateway Switch for Cisco IOS Release 12.1(5)YE2
  20/Aug/2001
Cisco IOS Software Release 12.1(5)YH
- Cisco VG200 - Cisco IOS Release 12.1(5) YH3
  31/Aug/2001
- Cisco VG200 - Cisco IOS Release 12.1(5) YH2
  13/Feb/2002
- Cisco VG200 - Cisco IOS Release 12.1(5)YH4
  22/Apr/2003
Cisco IOS Software Release 12.1(5)YI
- Release Notes for Cisco Catalyst 4224 Access Gateway Switch for Cisco IOS Release 12.1(5)YI
  15/Jan/2002
- Release Notes for Cisco Catalyst 4224 Access Gateway Switch for Cisco IOS Release 12.1(5)YI2
  22/Feb/2002
Cisco IOS Software Release 12.1(4)DB
- Cisco 6400 NSP - Release Notes for Cisco IOS Release 12.1(4)DB
  11/Dec/2000
- Cisco 6400 NSP � Release Notes for Cisco IOS Release 12.1(4)DB1
  26/Feb/2001
Cisco IOS Software Release 12.1(4)DC
- Cisco 6400 NRP - Cisco IOS Release 12.1(4)DC
  11/Dec/2000
Cisco IOS Software Release 12.1(3)DB
- Cisco 6400 NSP - Release Notes for Cisco IOS Release 12.1(3)DB
  02/Oct/2000
Cisco IOS Software Release 12.1(3)DC
- Cisco 6400 NRP - Cisco IOS Release 12.1(3) DC
  02/Oct/2000
Cisco IOS Software Release 12.1(3)XG
- Caveat Information for Release 12.1(3)XG5
  03/Aug/2001
- Cisco 1600 Series - Release Notes for Release 12.1(3)XG
  26/Feb/2002
- Cisco 800 Series - Release Notes for Release 12.1(3)XG
  20/Feb/2002
Cisco IOS Software Release 12.1(3)XJ
- Cisco 1700 Series - Release Notes for Release 12.1(3)XJ
  09/Mar/2001
Cisco IOS Software Release 12.1(3)XP
- Cisco SOHO Series - Release Notes for Release 12.1(3)XP
  14/Mar/2002
- Cisco 1700 Series - Release Notes for Release 12.1(3)XP
  25/Mar/2002
Cisco IOS Software Release 12.1(3)XQ
- Cisco AS5350 - Cisco IOS Release 12.1 XQ
  19/Mar/2001
- Cisco uBR7200 - Cisco IOS Release 12.1 XQ
  19/Mar/2001
- Cisco 3600 Series - Cisco IOS Release 12.1 XQ
  19/Mar/2001
- Cisco 2600 Series - Cisco IOS Release 12.1 XQ
  19/Mar/2001
Cisco IOS Software Release 12.1(3)XT
- Cisco 1700 Series - Release Notes for Release 12.1(3)XT
  09/Mar/2001
Cisco IOS Software Release 12.1(3a)XI
- Cisco AS5800 - Cisco IOS Release 12.1 XI
  26/Mar/2001
- Cisco AS5300 - Cisco IOS Release 12.1 XI
  26/Mar/2001
- Cisco ICS 7750 - Release Notes for Release 12.1(3)XI
  18/Sep/2000
- Cisco MC3810 - Cisco IOS Release 12.1 XI
  26/Mar/2001
- Cisco 3600 Series - Cisco IOS Release 12.1 XI
  26/Mar/2001
- Cisco 2600 Series - Cisco IOS Release 12.1 XI
  26/Mar/2001
- Release Notes for Cisco 7200 Series for Cisco IOS Release 12.1 XI
  12/Feb/2002
Cisco IOS Software Release 12.1(3a)XL
- Cisco AS5800 - Cisco IOS Release 12.1 XL
  09/Apr/2001
- Cisco uBR905 - Cisco IOS Release 12.1 XL
  07/Sep/2001
Cisco IOS Software Release 12.1(2)XF
- Cisco 800 Series - Release Notes for Release 12.1(2)XF
  12/Dec/2005
- Cisco 800 Series - Release Notes for Release 12.1(2)XF Feature Packs
  19/Jul/2000
Cisco IOS Software Release 12.1(2a)XH
- Cisco AS5800 - Cisco IOS Release 12.1 XH
  19/Mar/2001
- Cisco AS5300 - Cisco IOS Release 12.1 XH
  19/Mar/2001
- Cisco MC3810 - Cisco IOS Release 12.1 XH
  19/Mar/2001
- Cisco 3600 Series - Cisco IOS Release 12.1 XH
  19/Mar/2001
- Cisco 2600 Series - Cisco IOS Release 12.1 XH
  19/Mar/2001
Cisco IOS Software Release 12.1(1)DB
- Cisco 6400 NSP - Release Notes for Cisco IOS Release 12.1(1)DB1
  07/Aug/2000
Cisco IOS Software Release 12.1(1)DC1
- Cisco 6400 NRP - Cisco IOS Release 12.1(1)DC
  07/Aug/2000
Cisco IOS Software Release 12.1(1)XA
- Cisco MC3810 - Cisco IOS Release 12.1 XA
  03/Nov/2000
Cisco IOS Software Release 12.1(1)XB
- Cisco 800 Series - Release Notes for Release 12.1(1)XB
  10/Apr/2000
Cisco IOS Software Release 12.1(1)XC
- Cisco 1700 Series - Release Notes for Release 12.1(1)XC
  20/Feb/2002
- Cisco 1700 Series - Release Notes for Release 12.1(1)XC Feature Packs
  05/Apr/2000
Cisco IOS Software Release 12.1(1)XD
- Cisco AS5400 - Cisco IOS Release 12.1 XD
  13/Nov/2000
Cisco IOS Software Release 12.1(1)XE
- Cisco VG200 - Cisco IOS Release 12.1(1) XE1
  14/Feb/2002
Cisco IOS Software Releases 12.1 AA
- Cisco AS5800 - Cisco IOS Release 12.1 AA
  16/Dec/2005
- Cisco AS5300 - Cisco IOS Release 12.1 AA
  22/Apr/2002
- Cisco AS5200 - Cisco IOS Release 12.1 AA
  22/Apr/2002
Cisco IOS Software Releases 12.1 EC
- Release Notes for Cisco uBR7100 Series for Cisco IOS Release 12.1(9)EC1
  19/Feb/2002
- Release Notes for Cisco uBR7100 Series for Cisco IOS Release 12.1(8)EC1
  19/Feb/2002
- Release Notes for uBR7200 Series for Cisco IOS Release 12.1(9)EC1
  19/Feb/2002
- Release Notes for uBR7200 Series for Cisco IOS Release 12.1(8)EC1
  19/Feb/2002
Cisco IOS Software Releases 12.1 EX
- Release Notes for Cisco 7300 Series Routers for Cisco IOS Release 12.1 EX
  21/Jul/2003
- Release Notes for the Catalyst 3550 Multilayer Switch, Cisco IOS Release 12.1(22)EA10 and Later
  24/Sep/2008
- Release Notes for the Catalyst 3550 Multilayer Switch, Cisco IOS Release 12.1(22)EA9
  06/Dec/2006
- Release Notes for the Catalyst 3550 Multilayer Switch, Cisco IOS Release 12.1(22)EA8 and later
  12/May/2006
- Release Notes for the Catalyst 2955, Catalyst 2950, and Catalyst 2940 Switches, Cisco IOS Release 12.1(22)EA10 and Later
  30/Sep/2008
- Release Notes for the Catalyst 2955, Catalyst 2950, and Catalyst 2940 Switches, Cisco IOS Release 12.1(22)EA9
  22/May/2007
- Release Notes for the Catalyst 2955, Catalyst 2950, and Catalyst 2940 Switches, Cisco IOS Release 12.1(22)EA8 and Later
  24/Jan/2007