Cisco Xr 12000 Series Router Overview - Cisco XR 12000 Series Getting Started Manual

Cisco XR 12000 Series Router Overview

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Flexible Ethernet
The router uses Ethernet as its transport mechanism, which offers the following:
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L2VPN
The router uses L2VPNs, which offers the following:
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Cisco IOS XR Getting Started Guide for the Cisco XR 12000 Series Router
1-4
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 it summarizes the 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.
N-Tuple Hashing—A new 7-tuple hash algorithm, which provides better load balancing across equal
cost paths, is introduced. This algorithm uses additional Layer 4 information from the Layer 3
packet. For more information on 7-tuple hashing, see the Cisco IOS XR IP Addresses and Services
Configuration Guide for the Cisco XR 12000 Series Router.
Link Bundling Phase 3—The link bundle interface is enabled to be used as an edge-facing interface
by providing a number of new features, such as ACL, Mac Accounting, IPv6, PIMv6, uRPF, MVPN,
L2VPN, BFD, and Unequal BW. For more information on link bundling phase 3, see the Cisco IOS
XR Interface and Hardware Component Configuration Guide for the Cisco XR 12000 Series Router.
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 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 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.
Chapter 1 Introduction to Cisco IOS XR Software
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