Cisco ME 3400G-2CS - Ethernet Access Switch Software Configuration Manual page 52

Network Configuration Examples
denial-of-service attacks are avoided. The Cisco ME switch also provides mechanisms such as port
security and IP Source Guard to protect against MAC or IP spoofing. By using advanced access control
lists, the service providers have granular control of the types of traffic to enter the network.
To provide differential QoS treatment for different types of traffic, the Cisco ME switch can identify,
police, mark, and schedule traffic types based on Layer 2 to Layer 4 information. The Cisco modular
QoS command-line interface (CLI), or MQC, on Cisco ME switches provides an efficient method of QoS
configuration. You can configure a policer on ingress UNIs to ensure that a customer can send only the
amount of bandwidth paid for. On egress NNIs, you can use four different queues to provide different
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 3400 Ethernet Access Switch Software Configuration Guide
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Cisco ME Switches in a Multidwelling Configuration
Cisco routers
Catalyst 6500 switches
Cisco ME switches
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Home access gateways
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Chapter 1 Overview
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