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Features
Port and Protocol VLANs
The XP 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 XP confines MAC-layer broadcasts to the ports in the VLAN on
which the broadcast originates. XP 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 XP 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 XPs.
To simplify VLAN administration, the XP supports 802.1Q trunk ports, which allow you
to use a single port to "trunk" traffic from multiple VLANs to another XP or switch which
supports 802.1Q.
Routing
The XP 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
All other protocols that require routing must be tunneled using IP.
Note:
By default, the XP uses one MAC address for all interfaces. The XP can be configured to
have a separate MAC address for each IP interface and a separate MAC address for each
IPX interface. When the XP receives a packet whose destination MAC address is one of the
XP'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 Control Module
page 12
for information about the control module.)
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.
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Enterasys Xpedition 8000/8600 Getting Started Guide
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