Benefits; Rate Limiting; Vlans Overview - Foundry Networks NetIron M2404C User Manual

Foundry NetIron M2404C and M2404F Metro Access Switches

Rate Limiting

Rate Limiting was created to help control congestion on service provider networks and to help
ensure proper use of bandwidth resources. Rate Limiting allows network administrators to allocate
specific amounts of bandwidth per user or flow. Using Rate Limiting can ensure that there is no
needless congestion in the network and that bandwidth is aggregated properly toward the core.
Access lists can be used to provide rate control based on the user criteria. Different rates can be
assigned for different flows. The Rate Limiting can be applied per interface or VLAN.
For more information about Rate Limiting refer to "Configuring Access Control List (ACL)".

Benefits

Using VLANs on the networks provides the following advantages over traditional networks:
•
Flexibility – In traditional networks, when users are physically moved to different subnets, the
system administrators need to spend a great deal of time in updating the IP address of each end-
station. This is not required in VLANs.
•
Security - Devices within a VLAN can communicate directly only with devices in the same
VLAN. Communication between devices in different VLANs must pass through a routing device
or Layer 3 switch.
•
Segregation of Users - Traditional networks may become congested by broadcast traffic that is
directed to all network devices, whether or not they require it. With VLANs, the user can increase
the efficiency of the network by configuring each VLAN to contain only devices that must
communicate with each other.
•
Service per VLAN – In modern network architecture it is common to use separate VLANs for
different services and to define specific Quality of Service (QoS) sets and features corresponding
to each of these VLANs.

VLANs Overview

Port-Based VLANs
In a port-based VLAN, a VLAN name is given to a group of one or more ports on the device. By
default, all the ports on the device are members of the port-based VLAN named default (VLAN ID
1).
Figure 1 shows an example of a port-based VLAN network configuration. In this example, ports
1/1/11 through 1/1/6 are part of the VLAN that belongs to the R&D department. Ports 1/1/7
through 1/1/12 are part of the VLAN that belongs to the Engineering department. Ports 1/1/13
through 1/1/19 are part of the VLAN that belongs to the Finance department.
Virtual LANs © 2008 Foundry Networks, Inc.
Configuring VLANs (Rev.03)
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