Cisco Flexible Solutions Taps Bulletins

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Product Bulletin 
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Cisco IOS XR Software Release 5.2.3 for Cisco 
NCS 6000 Series Routers 
PB733831 
The Cisco
®
 Network Convergence System 6000 Series Routers (NCS 6000) offer 
exceptional network agility, packet optical convergence, and petabit-per-second 
system scale. The Cisco NCS 6000 Series also facilitates the build-out of the 
next-generation core to support elastic capacity at a low total cost of ownership (TCO) 
and deliver high-bandwidth mobile, video, and cloud services. 
Using the industry-leading Cisco IOS
®
 XR Software operating system running in a virtualized environment, the 
Cisco NCS 6000 Series advances the concept of distributed routing and virtualization. Using virtualized Cisco IOS 
XR Software, the Cisco NCS 6000 Series brings new levels of programmability and virtualization to increase 
application service offerings, accelerate provisioning, and make the network more cost-effective. 
The Cisco NCS 6000 Series is powered by the Cisco nPower Family of network processor units (NPUs). Cisco 
nPower devices are state-of-the-art programmable forwarding application-specific integrated circuits (ASICs), 
designed to deliver the industry’s first zero-packet loss (ZPL) and zero-topology loss (ZTL) software upgrade 
capability. 
The Cisco NCS 6000 Series is engineered for environmental efficiency by offering an adaptable power-
consumption model for its ASICs, and the use of revolutionary complementary metal-oxide semiconductor (CMOS) 
photonics technology. With these technologies together, the Cisco NCS 6000 Series can offer the most power-
efficient footprint in the service provider routing space. 
New Software Features 
Following are new software features in Cisco IOS XR Software Release 5.2.3 supported on Cisco NCS 6000 
Series routers: 
● 
Multichassis configuration: Multiple Cisco NCS 6008 single chassis can be connected using a Cisco NCS 
6000 fabric-card chassis to form a multichassis system. This hardware was introduced in Cisco IOS XR 
Software Release 5.2.1. Release 5.2.3 increases the multichassis scale to 4 + 2. The NCS system running 
Cisco IOS XR Software Release 5.2.3 supports four line-card chassis and two fabric-card chassis 
connected in one logical system. 
● 
In-Service Software Upgrade (ISSU) with ZPL and ZTL: The Cisco NCS system can now reload the 
software running on the route processor and line cards to a future Cisco IOS XR Software release without 
any effect on the forwarding plane and topology. This feature applies to Software Maintenance Upgrades 
(SMUs) and minor and major Cisco IOS XR Software upgrades and downgrades. The feature is limited to 
Cisco IOS XR Release 5.2.3 and future releases. 
● 
Inter-AS support: The Cisco NCS 6000 Series offers full support of the inter-autonomous system.