Cisco IOS Software Releases 12.1 Mainline Bulletins - Cisco Systems

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Read updated news and information about Cisco products.

- Cisco IOS Software Product Lifecycle Dates & Milestones
  25/Mar/2009
- Cisco IOS S/W Release 12.1(5)YE - No. 1343
  23/Mar/2006
- Cisco IOS Software Release 12.1T - No. 1065
  23/Mar/2006
- Cisco IOS Software 12.1(5)XV - No. 1267
  23/Mar/2006
- Cisco IOS X Release 12.1(3)XL - No. 1190
  23/Mar/2006
- 12.1(5)YD Product Bulletin, No. 1298
  23/Mar/2006
- Cisco IOS Software Release 12.1(26)EB
  17/May/2005
- Cisco IOS Software Center Update Q&A
  05/May/2005
- Cisco IOS Software Center Updates
  05/May/2005
- Cisco IOS Software Release 12.1(23)EB for Cisco Catalyst 8500 Series MSR
  06/Dec/2004
- 12.1(22)EB Product Bulletin (PDF - 62 KB)
  23/Apr/2004
- 12.1(20)EB Product Bulletin (PDF - 20 KB)
  15/Jan/2004
- Milestone Dates for Cisco IOS software Release 12.1T, No. 1244
  01/Dec/2003
- Cisco IOS Software Release 12.1(12c)EV
  26/Nov/2003
- Cisco Catalyst 8500/LightStream 1010 IOS Release 12.1(19)EB (PDF - 70 KB)
  25/Aug/2003
- HD Analog Interface Card and H/W Encryption Accelerator
  12/Aug/2003
- Cisco IOS Software Release 12.1(19)EW for Sup II-Plus, III, IV
  23/Jun/2003
- Cisco Catalyst 8500/LightStream 1010 IOS Release 12.1(14)EB (PDF - 64 KB)
  31/Mar/2003
- IOS Software Release 12.1(13)EW Catalyst 4500 Sup Engine III/IV
  22/Jan/2003
- Catalyst 8500/LightStream 1010 IOS Release 12.1(13)EB, No. 2002 (PDF - 73 KB)
  13/Jan/2003
- Cisco IOS Software 12.1(12c)EA1 for Catalyst 3550, 2950 Series
  09/Dec/2002
- Cisco IOS Early Deployment Release 12.1(10)EX, 12.1(10)EX1, & 1
  02/May/2002
- Cisco IOS X-Release 12.1(5)YI
  22/Jan/2002
- Cisco IOS X-Release 12.1CX, No. 1287
  19/Nov/2001
- Standards Supported in Cisco IOS Software Release 12.1/12.1T
  04/Oct/2001
- 12.1(5)YE Product Bulletin
  20/Aug/2001
- Cisco IOS SW Release 12.1(5)YB - No. 1277
  17/Jul/2001
- 12.1(5)XU Product Bulletin, No. 1250
  14/Feb/2001
- Cisco IOS X-Release 12.1(5)XM
  15/Dec/2000
- Cisco IOS SW 12.1T Ordering Procedures & Platform - No. 1064
  22/Nov/2000
- 12.1(3)XI Product Bulletin
  10/Nov/2000
- Cisco IOS X-Release 12.1(3)XQ - No. 1204
  19/Oct/2000
- Cisco IOS Software Release 12.1EC, No. 1136
  17/Jul/2000
- Cisco IOS X-Release 12.1(2a)XH
  21/Jun/2000
- Cisco IOS Release 12.1(DA)- No. 1100
  24/May/2000
- Cisco IOS SW Release 12.1(1)XE - No. 1098
  22/May/2000
- 12.1(1)XD Product Bulletin
  17/May/2000
- Cisco IOS Software Release 12.1(1)AA - No. 1079
  27/Apr/2000
- Cisco IOS Software Release 12.1(1)EX - No. 1055
  08/Mar/2000