Cisco Ios Versions
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1C
IOS V
ISCO
ERSIONS
packetlife.net
IOS Nomenclature
Release Lifecycle
12.4(7a)
Mainline
EOS Notice
Maintenance Release
EOS
Individual Release
Numbered Version
EOE
12.4(9)T1
EOL
T Train
0
12
24
36
48
60
72
84
96
Maintenance Release
Months
Individual Release
First Customer Shipment (FCS)
New Feature Identifier
The release is made available to Cisco customers on CCO
Numbered Version
EOS Notice
Notification of upcoming EOS
12.2(25)SEB4
S Train
End of Sale (EOS)
Release
The release is no longer orderable or included in
manufactured shipments
Individual Release
Numbered Version
End of Engineering (EOE)
The last day for software fixes; only TAC assistance is offered
from this point
3.2.1
IOS XR
End of Life (EOL)
The last day for TAC support; release becomes obsolete;
Major Release
upgrade is only option for continued support
Minor Release
Maintenance Release
IOS Filename
c3725-entbase-mz.124-6.T.bin
IOS Package Trees
Hardware
Advanced Enterprise Services
Feature Set
Memory Location
Compression Format
Advanced IP Services
Enterprise Services
Maintenance Release
Individual Release
Advanced
Enterprise
T Designator
SP Services
Security
Base
Deployment Classifications
Early Deployment (ED)
IP Voice
Offers new feature, platform, or interface support
General Deployment (GD)
A major release considered qualified for deployment on
IP Base
critical devices
Limited Deployment (LD)
Advanced Enterprise Services
A major release prior to reaching its GD milestone
Deferred (DF)
Known defective images; should not be installed
Advanced IP Services
Enterprise Services
IOS Version Verification
show version
IP Services
dir <filesystem>:
verify <filesystem>:<image>
IP Base
by Jeremy Stretch
v2.0
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