Cisco ME-C3750-24TE-M Manual de usuario descargar pdf (Pagina 3)

provider’s network. In addition, the Cisco Catalyst 3750 Metro Series supports Selective QinQ whereby the switch

can assign a service provider VLAN tag to the customer traffic based on the ingress interface and customer’s

VLAN ID.

Layer 2 VPN Using VLAN Translation

VLAN translation is also used for Layer 2 VPN service. Instead of double-tagging the packet, the VLAN translation

feature simply translates a customer VLAN ID to a service provider VLAN ID as the packet enters the service

provider network, and vice versa as the packet exits the service provider network. By simply mapping the VLAN ID

and leaving the rest of the packet untouched, the enterprise customer’s QoS information can be preserved and

honored as it traverses the service provider network.

Layer 2 VPN Using EoMPLS

EoMPLS is a tunneling mechanism that allows service providers to tunnel customer Layer 2 traffic through a Layer

3 MPLS network. This gives the service provider the best of both worlds – a Layer 2 TLS offering and the

scalability of an MPLS core without needing a spanning tree. The Cisco Catalyst 3750 Metro Series supports

EoMPLS on a per-port or per-VLAN basis, enabling service providers to build an end-to-end MPLS network all the

way to the CLE.

Layer 2 VPN with H-VPLS Architecture

VPLS is a multipoint Layer 2 VPN technology that allows multiple sites to be connected over a simulated Ethernet

broadcast domain that is supported across a provider-provisioned MPLS network. H-VPLS is one of IETF’s VPLS

standards that provides an MPLS-based distributed-PE architecture. H-VPLS has two design options:

●

Ethernet access network: Access networks are 802.1Q networks, and the core network is MPLS.

●

MPLS access network: Access networks and the core network are both MPLS.

The Cisco Catalyst 3750 Metro Series supports both architecture options as the PE-CLE switch in the H-VPLS

access network.

Layer 3 VPN Using Multi-VRF CE

Multi–Virtual Routing and Forwarding Customer Edge (Multi-VRF CE), also called VRF-lite, on the Cisco Catalyst

3750 Metro Series enables the creation of a Layer 3 VPN service by keeping separate routing tables for each VPN

customer without needing to run MPLS on the switch. Multi-VRF CE is a feature that allows a service provider to

support two or more VPNs on a single Cisco Catalyst 3750 Metro Series switch, where IP addresses can be

overlapped among the VPNs. Multi-VRF CE uses input interfaces to distinguish routes for different VPNs and

forms virtual packet-forwarding tables by associating one or more Layer 3 interfaces with each VRF.

Layer 3 VPN Using MPLS VPN

The Cisco Catalyst 3570 Metro Series supports MPLS VPNs, allowing service providers to build true end-to-end

MPLS networks and to offer MPLS VPN services to their enterprise and commercial customers. The MPLS VPN

model is a true peer VPN model that enforces traffic separations by assigning unique VRFs to each customer’s

VPN. Thus, users in a specific VPN cannot see traffic outside of that VPN. Traffic separation occurs without

tunneling or encryption because it is built directly into the network.

Utmost SLA Support Using Traffic Shaping and Bidirectional Hierarchical Quality of Service (Through Enhanced

Services Ports)

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