Hardware Family

Primary Cisco IOS Software Trains

Branch Routers

Cisco 800, 1800, 2800, and 3800 Integrated Series Routers

Cisco IOS 15
Cisco IOS 12.4T

Cisco 1900, 2900, and 3900 Integrated Services Routers

Cisco IOS 15

WAN Routers

Cisco 7200 VXR Series and Cisco 7301 Router

Cisco IOS 15
Cisco IOS 12.4T
Cisco IOS 12.2SR
Cisco IOS 12.2SB

Cisco 7201 Router

Cisco IOS 15
Cisco IOS 12.4T
Cisco IOS 12.2SR

Cisco 7304 Router

Cisco IOS 12.2S

Cisco 7500 Series Routers

Cisco IOS 12.4
Cisco IOS 12.2S

Cisco ASR 1000 Series Routers

Cisco IOS XE 2.4
Cisco IOS XE 2.3

Service Provider

Cisco 7600 Series Routers

Cisco IOS 12.2SR

Cisco 10000 Series Routers, Performance Routing Engine 2 through 4

Cisco IOS 12.2SB

Cisco ASR 9000 Series Routers

Cisco IOS XR 3.9
Cisco IOS XR 3.8
Cisco IOS XR 3.7

Cisco 12000 Series Routers running Cisco XR Software
(Also known as Cisco XR 12000 Series Routers)

Cisco IOS XR 3.9
Cisco IOS XR 3.8
Cisco IOS XR 3.7

Cisco 12000 Series Routers

Cisco IOS 12.0S
Cisco IOS 12.0SY
(See Note 1)

Cisco CRS-1 Carrier Routing System

Cisco IOS XR 3.9
Cisco IOS XR 3.8
Cisco IOS XR 3.7