Flexible Ethernet - Cisco ASR 9000 Getting Started Manual

Chapter 1 Introducing to the Cisco ASR 9000 Series Aggregation Services Router
•
•
•
•
•
•
•
•
•
•
•

Flexible Ethernet

The router uses Ethernet as its transport mechanism, this offers the following:
•
•
•
•
OL-17502-01
F I N A L D R A F T — C i s c o C o n f i d e n t i a l
Flexible VLAN classification: VLAN classification into Ethernet flow points (EFPs) includes
single-tagged VLANs, double-tagged VLANs (QinQ and IEEE 802.1ad), contiguous VLAN ranges,
and noncontiguous VLAN lists.
IEEE Bridging: The software supports native bridging based on IEEE 802.1Q, IEEE 802.1ad, and
QinQ VLAN encapsulation mechanisms on the router.
IEEE 802.1s Multiple Spanning Tree (MST): MST extends the IEEE 802.1w Rapid Spanning Tree
Protocol (MSTP) to multiple spanning trees, providing rapid convergence and load balancing.
MST Access Gateway: This feature provides a resilient, fast-convergence mechanism for
aggregating and connecting to Ethernet-based access rings.
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.
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
Ethernet virtual connections (EVCs): Ethernet services are supported using individual EVCs to
carry traffic belonging to a specific service type or end user through the network. You can use
EVC-based services in conjunction with MPLS-based L2VPNs and native IEEE bridging
deployments.
Flexible VLAN classification: VLAN classification into Ethernet flow points (EFPs) includes
single-tagged VLANs, double-tagged VLANs (QinQ and IEEE 802.1ad), contiguous VLAN ranges,
and noncontiguous VLAN lists.
IEEE Bridging: The software supports native bridging based on IEEE 802.1Q, IEEE 802.1ad, and
QinQ VLAN encapsulation mechanisms on the router.
IEEE 802.1s Multiple Spanning Tree (MST): MST extends the IEEE 802.1w Rapid Spanning Tree
Protocol (MSTP) to multiple spanning trees, providing rapid convergence and load balancing.
Cisco ASR 9000 Series Aggregation Services Router Getting Started Guide
Router Overview
1-3