Port And Protocol Vlans - Cabletron Systems SmartSwitch 8000 Getting Started Manual

Chapter 1: Features Overview

Port and Protocol VLANs

The SSR supports the following types of Virtual LANs (VLANs):
• Port-based VLANs – A port-based VLAN is a set of ports that comprises a Layer-2
broadcast domain. The SSR confines MAC-layer broadcasts to the ports in the VLAN
on which the broadcast originates. SSR ports outside the VLAN do not receive the
broadcast.
• Protocol-based VLANs – A protocol-based VLAN is a named set of ports that
comprises an IP or IPX broadcast domain. The SSR confines IP or IPX broadcasts to the
ports within the IP or IPX based VLAN. Protocol-based VLANs sometimes are called
subnet VLANs or Layer-3 VLANs.
You can include the same port in more than one VLAN, even in both port-based and
protocol-based VLANs. Moreover, you can define VLANs that span across multiple SSRs.
To simplify VLAN administration, the SSR supports 802.1Q trunk ports, which allow you
to use a single port to "trunk" traffic from multiple VLANs to another SSR or switch
which supports 802.1Q.
Routing
The SSR provides wire-speed routing for the following protocols:
• Internet Protocol (IP) – protocol that switching and routing devices use for moving
traffic within the Internet and within many corporate intranets
• Internet Packet Exchange (IPX) – protocol by Novell used in NetWare products
Note: All other protocols that require routing must be tunneled using IP.
By default, the SSR uses one MAC address for all interfaces. The SSR can be configured to
have a separate MAC address for each IP interface and a separate MAC address for each
IPX interface. When the SSR receives a packet whose destination MAC address is one of
the SSR's IP or IPX interface MAC addresses, the line card that received the packet from
the network uses information in the line card's L3 lookup tables (or information supplied
by the Control Module) to route the packet to its IP destination(s). (See
on page 14
You can create only one IP and IPX interface on a single port or VLAN. You can add
secondary IP addresses to the same IP interface. When you add an interface to a set of
ports, you are adding a VLAN to those ports. Ports that contain IP and IPX interfaces can
also still perform Layer-2 bridging.
8
for information about the Control Module.)
"Control Module"
SSR 8000/8600 Getting Started Guide