Cisco XR 12000 Specifications download pdf (Page 27)

CHAPTER

2-1

Cisco XR 12000 Series Router SIP and SPA Software Configuration Guide, Release 3.2

Release 3.2, OL-6396-01, Rev.A1 January 9, 2006

Overview of the Cisco XR 12000 Series Router

SIPs

This chapter provides an overview of the release history, and feature and Management Information Base

(MIB) support for the SPA interface processors (SIPs) supported on the Cisco XR 12000 Series Routers.

This chapter includes the following sections:

• Release History, page 2-1

• Cisco 12000 SIP-600 Features, page 2-1

• Supported MIBs, page 2-3

• Displaying the SPA Hardware Type, page 2-6

Release History

Table 2-1 describes the release history for the SIP hardware.

Cisco 12000 SIP-600 Features

The Cisco 12000 SIP-600 provides a common 10 Gbps forwarding and queuing engine responsible for

packet classification, forwarding, queuing, and accounting without compromising performance. The

Cisco 12000 SIP-600 has two forwarding engines, one for ingress and one for egress. This allows the

user to implement different features and QoS policies for the ingress and egress interfaces. The multicast

replication is done by the egress forwarding engine, hence a very scalable multicast with built-in QoS.

The Modular Physical Layer Interface Module (PLIM) front end hosts up to 2 SPAs. Each SPA has a

dedicated 10 Gbps interface to the SPA controller. The SPA controller uses a fair bandwidth allocation

algorithm to share available and excess bandwidth between the 2 SPAs. The oversubscribed SPA does

not cause any packet-drop on the nonoversubscribed SPA, and any unused bandwidth from one SPA is

used by the other SPA.

Table 2-1 Release History for SIP Hardware

Release Modification

Cisco IOS-XR Release 3.2 Support for the following SIP hardware was introduced on the

Cisco XR 12000 Series Routers:

• Cisco 12000 SIP-600

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 135 136

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Cisco XR 12000 Specifications Page 27