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Cisco ASR 9000 Series Aggregation Services Router Getting Started Guide
OL-17502-02
Chapter 1 Introducing the Cisco ASR 9000 Series Aggregation Services Router
Router Overview
Layer 3 routing
The Cisco ASR 9000 Series router runs Cisco IOS XR Software which supports Layer 3 routing and a
range of IPv4 services and routing protocols, including the following:
• Intermediate System-to-Intermediate System (IS-IS)
• Open Shortest Path First (OSPF)
• static routing
• IPv4 Multicast
• Routing Policy Language (RPL)
• Hot Standby Router Protocol (HSRP)
• Virtual Router Redundancy Protocol (VRRP)
MPLS VPN
The Cisco ASR 9000 Series router supports MPLS VPN, this offers the following:
• MPLS L3VPN: The IP VPN feature for MPLS allows a Cisco IOS Software or Cisco IOS-XR
Software network to deploy scalable IPv4 Layer 3 VPN backbone services. An IP VPN is the
foundation that companies use for deploying or administering value-added services, including
applications and data hosting network commerce and telephony services to business customers.
• Carrier Supporting Carrier (CSC): CSC allows a MPLS VPN service provider to connect
geographically isolated sites using another backbone service provider and still maintain a private
address space for its customer VPNs. It is implemented as defined by IETF RFC 4364.
QoS
The Cisco ASR 9000 Series router supports many types of quality of service (QoS), this offers the
following:
• QoS: Comprehensive QoS support with up to 3 million queues, Class-Based Weighted Fair Queuing
(CBWFQ) based on a three-parameter scheduler, Weighted Random Early Detection (WRED),
two-level strict priority scheduling with priority propagation, and 2-rate, 3-color (2R3C) Policing
are all supported.
• Cisco IOS XR Software: This software supports a rich variety of QoS mechanisms, including
policing, marking, queuing, dropping, and shaping. Additionally, the operating systems support
Modular QoS CLI (MQC). Modular CLI is used to configure various QoS features on various Cisco
platforms.
• H-QoS: Four-level H-QoS support is provided for EVCs with the following hierarchy levels: port,
group of EFPs, EFP, and class of service. This level of support allows for per-service and per-end
user QoS granularity.
MPLS TE
The Cisco ASR 9000 Series router supports MPLE TE, this offers the following:
• MPLS TE: Cisco IOS XR Software supports MPLS protocols such as Traffic Engineering/Fast
Reroute (TE-FRR), Resource Reservation Protocol (RSVP), Label Distribution Protocol (LDP), and
Targeted Label Distribution Protocol (T-LDP).