Cisco Cisco IOS Software Release 12.4(2)XB6

To determine the version of Cisco IOS software running on your router, log in to the router and enter the 
show version EXEC command.

The BWG Release 2.1 on the Cisco 7600 hardware platform requires SUP software version SRE. 
However, BWG Release 2.1 will also work with limited features with an earlier SUP software version 
SRD. 

In order to make BWG 2.1work with an earlier version of SUP-SRD, configure the following hidden CLI 
at the global configuration mode:

With SUP-SRD, BWG Release 2.1 will primarily be used for Cisco-R6, PMIP, and other BWG1.x 
features.

If you use the SUP-SRD image, the following features in BWG Release 2.1 are not supported:

SLB Stickiness Support 

NWG R6 in SLB-mode.

The following features were introduced and supported on the BWG prior to Cisco IOS Release 
12.4(24)YG1:

Support for Proxy Mobile IPv4 (PMIPv4)

AAA-Based Hot-lining (CoA)

DSCP Marking

WiMAX NWG Specification (1.2.2) Compliance

Accounting Start Response

SLB Stickiness Support

AAA Packet of Disconnect Message (PoD)

AAA-based Static IP Address Provisioning

Lawful Intercept

Hitless Software Upgrade

Redundancy DHCP server

Host Based Accounting

Mobile to Mobile Traffic Steering

router(config)# wimax agw sup-backward-compatible

Specifies that the BWG will work with the SRD 
Supervisor image.