Cisco XR 12000 and 12000 Series SPA Interface Processor-600
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Updated:Apr 18, 2006
The Cisco® I-Flex design combines shared port adapters (SPAs) and SPA interface processors (SIPs), leveraging an extensible design that enables service prioritization for voice, video and data services. Enterprise and service provider customers can take advantage of improved slot economics resulting from modular port adapters that are interchangeable across Cisco routing platforms. The I-Flex design maximizes connectivity options and offers superior service intelligence through programmable interface processors that deliver line-rate performance. I-Flex enhances speed-to-service revenue and provides a rich set of QoS features for premium service delivery while effectively reducing the overall cost of ownership. This data sheet contains the specifications for the Cisco XR 12000 and 12000 Series SPA Interface Processor-600 (Cisco XR 12000/12000 SIP-600; refer to Figure 1).
Figure 1. Cisco XR 12000/12000 Series SIP-600 with Gigabit Ethernet SPAs
The Cisco XR 12000/12000 SIP-600 is a modular high-speed 10-Gbps SIP based on IP Services Engine (ISE) technology. The Cisco XR 12000/12000 SIP-600 hosts the common SPAs used for interconnecting routers with each other or with other networking devices such as Web servers, storage devices, and ATM or Ethernet switches. The Cisco XR 12000/12000 SIP-600 enhances and scales all functions and services previously available on the 2.5-Gbps ISE line card. Examples of these enhancements include line-rate IPv6 at 10 Gbps, scalable multicast and native multicast quality of service (QoS), and thousands of user interfaces, each dynamically associated with one or multiple class-of-service (CoS) queues.
The Cisco XR 12000/12000 SIP-600 provides:
• A common 10-Gpbs forwarding and queuing engine responsible for packet classification, forwarding, queuing, and accounting without compromising the performance. The Cisco XR 12000/12000 SIP-600 has two forwarding engines, one for ingress and one for egress. This allows the user to implement different features and QoS policies at the incoming traffic independently from the features and the QoS policies applied at the egress interfaces. The multicast replication is done by the egress forwarding engine, hence a very scalable multicast with built-in QoS.
• A modular physical layer interface module (PLIM) front end that hosts up to two SPAs. Each SPA has a dedicated 10 Gbps to the SPA controller. A fair bandwidth allocation algorithm shares available and excess bandwidth between the 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). The Cisco XR 12000/12000 SIP-600 supports any combination of the following pluggable SPAs and Layer 2 encapsulations: concatenated OC-192 and OC-48; Gigabit Ethernet and 10 Gigabit Ethernet interfaces; Point-to-Point Protocol (PPP), High-Level Data Link Control (HDLC), and Frame Relay; Dynamic Packet Transport (DPT), Resilient Packet Ring (RPR), and 802.17; and VLANs.
• A SPA controller that is responsible for adapting the user traffic flowing between the SPA interfaces and the Layer 3 forwarding engine. The SPA controller can handle up 256 physical ports, and has enough buffers to absorb up to 6 msec of 20-Gbps traffic burst without packet drops. The SPA controller has two levels of priority queuing with Deficit Round Robin (DRR) and strict priority servicing. The strict priority is designed to protect higher-priority traffic by first dropping lower-priority packets in an oversubscribed configuration (persistent incoming traffic rate of 20 Gbps).
KEY FEATURES AND BENEFITS
The Cisco XR 12000/12000 SIP-600 offers the following key features for service providers who are implementing new value-added services from their network infrastructures:
• Dynamic allocation of 4096 input-shaped queues to any interface (or subinterface), Frame Relay connection, or VLAN
Cisco XR 12000/12000 Series SPA Interface Processor-600
Cisco XR 12000/12000 Series SPA Interface Processor-600, spare
Bezel extenders are required on the installed base of Cisco 12000 10-slot and 16-slot chassis to allow installation of front covers when the SIP-600 SIPs are inserted in these chassis. Bezel extender kits are available for the 10-slot chassis (part number ACS-10-BZLX2=) and for the 16-slot chassis (part number ACS-16-BZLX2=).
Table 3 provides a compatibility matrix for the Cisco XR 12000 and 12000 Series SIP 600.
Table 3. Supported SPAs
SPA Part Number
SERVICE AND SUPPORT
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Cisco Advanced Services.