Cabletron Systems 9032578-02 manual SSR Vlan Support, Multicast-based VLANs, Policy-based VLANs

Models: 9032578-02

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Chapter 2: Bridging Configuration Guide

Multicast-based VLANs

Multicast-based VLANs are created dynamically for multicast groups. Typically, each multicast group corresponds to a different VLAN. This ensures that multicast frames are received only by those ports that are connected to members of the appropriate multicast group.

Policy-based VLANs

Policy-based VLANs are the most general definition of VLANs. Each incoming (untagged) frame is looked up in a policy database, which determines the VLAN to which the frame belongs. For example, you could set up a policy which creates a special VLAN for all email traffic between the management officers of a company, so that this traffic will not be seen anywhere else.

SSR VLAN Support

The SSR supports:

Port-based VLANs

Protocol-based VLANs

Subnet-based VLANs

When using the SSR as an L2 bridge/switch, use the port-based and protocol-based VLAN types. When using the SSR as a combined switch and router, use the subnet-based VLANs in addition to port-based and protocol-based VLANs. It is not necessary to remember the types of VLANs in order to configure the SSR, as seen in the section on configuring the SSR.

VLANs and the SSR

VLANs are an integral part of the SSR family of switching routers. The SSR switching routers can function as layer-2 (L2) switches as well as fully-functonal layer-3 (L3) routers. Hence they can be viewed as a switch and a router in one box. To provide maximum performance and functionality, the L2 and L3 aspects of the SSR switching routers are tightly coupled.

The SSR can be used purely as an L2 switch. Frames arriving at any port are bridged and not routed. In this case, setting up VLANs and associating ports with VLANs is all that is required. You can set up the SSR switching router to use port-based VLANs, protocol- based VLANs, or a mixture of the two types.

The SSR can also be used purely as a router, i.e., each physical port of the SSR is a separate routing interface. Packets received at any interface are routed and not bridged. In this case, no VLAN configuration is required. Note that VLANs are still created implicitly by

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SmartSwitch Router User Reference Manual

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Cabletron Systems 9032578-02 manual SSR Vlan Support, Multicast-based VLANs, Policy-based VLANs, VLANs and the SSR

9032578-02 specifications

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