Примечания к выпуску для Cisco Cisco IOS XR Software Release 4.0

The following sections contain information on new features and enhancements in Cisco IOS XR 
Software Release 4.0.3:

Cisco Session Border Controller (SBC) is not supported on any platform in Cisco IOS XR Software 
Release 4.0.3. Cisco IOS XR Software Release 3.7 is the last release that supports SBC.

Cisco IOS XR Software Release 4.0.3 adds support for Traffic Engineering over ATM on the 
Cisco XR 12000 Series Router platform. This feature is supported on the ATM subinterfaces of the 
following line cards and SPAs:

Engine 5 Line Cards

1-Port Clear Channel OC-3 ATM SPA

3-Port Clear Channel OC-3 ATM SPA

1-Port Clear Channel OC-12 ATM SPA

2-Port Channelized T3/E3 ATM CEoP SPA

24-Port Channelized T1/E1 ATM CEoP SPA 

T3/E3 and T1/E1 alarms are not supported for FRR on channelized SPAs. Switchover to backup tunnels 
cannot be achieved within 50 ms.

BFD is not supported for this feature.

For more information about MPLS-TE, refer to the Implementing MPLS Traffic Engineering section of 
the Cisco IOS XR MPLS Configuration Guide for the Cisco XR 12000 Series Router, Release 4.0.

No new hardware was introduced on the Cisco XR 12000 Series Router in Cisco IOS XR Software 
Release 4.0.3.

For detailed information on the shared port adapters (SPAs) and SPA interface processors (SIPs), see 
the following documents:

Contact gsr-pm@cisco.com for hardware availability.