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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-07
Chapter 1 Overview
Network Configuration Examples
levels of priority for different types of traffic. One queue can be assigned as a low-latency queue to
provide expedited service for latency sensitive traffic such as voice. You can also configure a rate-limiter
on the low-latency queues to prevent other queues from being deprived due to misconfiguration.
When an end station in one VLAN needs to communicate with an end station in another VLAN, a router
or switch routes the traffic to the appropriate destination VLAN, providing inter-VLAN routing. VLAN
access control lists (VLAN maps) provide intra-VLAN security and prevent unauthorized users from
accessing critical pieces of the network. The routers also provide firewall services, Network Address
Translation (NAT) services, voice-over-IP (VoIP) gateway services, and WAN and Internet access.
Figure 1-1 Cisco ME Switches in a Multidwelling Configuration
Layer 2 VPN Application
Enterprise customers need not only high bandwidth, but also the ability to extend their private network
across the service provider’s shared infrastructure. With Ethernet in the WAN network, service providers
can meet the bandwidth requirements of enterprise customers and use VPN features to extend customers’
networks.
Enterprise customers can use Layer 2 VPN to transparently move any type of traffic across a
service-provider network, and create virtual pipes across the service provider infrastructure. In contrast
to Layer 3 VPN service, Layer 2 VPN lowers operational expenses by minimizing enterprise user-facing
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