Specifications

2-2
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
Chapter 2 Overview of the Cisco XR 12000 Series Router SIPs
Cisco 12000 SIP-600 Features
The Cisco 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)
• Frame Relay
• Dynamic Packet Transport (DPT)
• Resilient Packet Ring (RPR)
• 802.17
• VLANs
The SPA controller adapts the user traffic flowing between the SPA interfaces for the Layer 3 forwarding
engine. The SPA controller has two levels of priority queuing with Deficit Round Robin (DRR) and
Strict Priority Servicing. Strict Priority Servicing protects higher-priority packets by dropping lower
priority packets first, in an oversubscribed configuration (persistent incoming traffic rate of 20 Gbps.)
The Cisco 12000 SIP-600 provides the following key features:
• Dynamic allocation of 4096 input-shaped queues to any interface, subinterface, Frame Relay
connection, VLAN.
• Ingress Queuing:
– 2048 unicast Modified DRR (MDRR) queues
– 16 high priority queues
– 8 multicast queues
– 2 fabric priority queues
• Egress Queuing:
– 8192 Modified DRR (MDRR) queues dynamically shared across 4096 interfaces;
– Hierarchical shaping (interface, queue)
• High number of IPv4, IPv6, Multiprotocol Label Switching (MPLS), and MPLS VKPN unicast and
multicast routes: Up to 1M IPv4/MPLS routes and up to 512,000 IPv6 prefixes.
• Per-VLAN/source-destination MAC address filtering, trunking, accounting, QoS, match VLAN
QoS, Hot Standby Router Protocol (HSRP)/Virtual Router Redundancy Protocol (VRRP)
hierarchical rate limiting and policing, dynamic queuing, and traffic shaping.
• Input and output full NetFlow Version 8 in hardware.
• Input and output Sampled NetFlow, Versions 5, 8, and 9 in hardware.
• Building Integrated Timing Supply (BITS)
• Online Insertion Removal (OIR) of SPAs; OIR of one SPA does not effect the traffic on other SPA
interfaces.
• Multi-router Automatic Protection Switching (MR-APS)
• Layer 2 VPNs over MPLS (Any transport over MPLS (AToM)) and Over IP Layer 2 Tunneling
Protocol Version 3 (L2TPv3)