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FINAL DRAFT —Cisco Confidential
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Cisco ASR 9000 Series Aggregation Services Router Getting Started Guide
OL-17502-01
Chapter 1 Introducing to the Cisco ASR 9000 Series Aggregation Services Router
Router Overview
• MST Access Gateway: This feature provides a resilient, fast-convergence mechanism for
aggregating and connecting to Ethernet-based access rings.
L2VPN
The router uses L2VPNs, this offers the following:
• Virtual Private LAN Services (VPLS): VPLS is a class of VPN that supports the connection of
multiple sites in a single, bridged domain over a managed IP/MPLS network. It presents an Ethernet
interface to customers, simplifying the LAN and WAN boundary for service providers and
customers, and enabling rapid and flexible service provisioning because the service bandwidth is
not tied to the physical interface. All services in a VPLS appear to be on the same LAN, regardless
of location.
• Hierarchical VPLS (H-VPLS): H-VPLS provides a level of hierarchy at the edge of the VPLS
network for increased scale. QinQ access and H-VPLS pseudowire access options are supported.
• Virtual Private WAN Services/Ethernet over MPLS (VPWS/EoMPLS): EoMPLS transports
Ethernet frames across an MPLS core using pseudowires. Individual EFPs or an entire port can be
transported over the MPLS backbone using pseudowires to an egress interface or subinterface.
• Pseudowire redundancy: Pseudowire redundancy supports the definition of a backup pseudowire to
protect a primary pseudowire that fails.
• Multisegment pseudowire stitching: Multisegment pseudowire stitching is a method for
interworking two pseudowires together to form a cross-connect relationship.
Multicast
The router supports multicast, this offers the following:
• IPv4 Multicast: IPv4 Multicast supports Internet Group Management Protocol Versions 2 and 3
(IGMPv2/v3), Protocol Independent Multicast Source Specific Multicast (SSM) and Sparse Mode
(SM), Multicast Source Discovery Protocol (MSDP), and Anycast Rendezvous Point (RP).
• IGMP v2/v3 Snooping: This Layer 2 mechanism efficiently tracks multicast membership on an
L2VPN network. Individual IGMP joins are snooped at the VLAN level or pseudowire level and
then summarizes results into a single upstream join message. In residential broadband deployments,
this feature enables the network to send only channels that are being watched to the downstream
users.
OAM
The router supports different types of operations, administration, and maintenance (OAM), this offers
the following:
• E-OAM (IEEE 802.3ah): Ethernet link layer OAM is a vital component of EOAM that provides
physical-link OAM to monitor link health and assist in fault isolation. Along with IEEE 802.1ag,
Ethernet link layer OAM can be used to assist in rapid link-failure detection and signaling to remote
end nodes of a local failure.
• E-OAM (IEEE 802.1ag): Ethernet Connectivity Fault Management is a subset of EOAM that
provides numerous mechanisms and procedures that allow discovery and verification of the path
through IEEE 802.1 bridges and LANs.
• MPLS OAM: This protocol supports label-switched-path (LSP) ping, LSP TraceRoute, and virtual
circuit connectivity verification (VCCV).