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Bridging
The IA 1100/1200 provides the following types of high-speed bridging:
•
Address-based bridging – The IA 1100/1200 performs this type of bridging by looking
up the destination address in an L2 lookup table on the Gigabit port that receives the
bridge packet from the network. The L2 lookup table indicates the exit port(s) for the
bridged packet. If the packet is addressed to the IA 1100/1200's own MAC address, the
packet is routed rather than bridged.
•
Flow-based bridging – The IA 1100/1200 performs this type of bridging by looking up
an entry in the L2 lookup table containing both the source and destination addresses
of the bridge packet.
Your choice of bridging method does not affect IA 1100/1200 performance. However,
address-based bridging is more efficient because it requires fewer table entries while flow-
based bridging provides tighter management and control over bridged traffic.
The IA 1100/1200 ports perform address-based bridging by default, but can be configured
to perform flow-based bridging instead of address-based bridging on a per-port basis. A
port cannot be configured to perform both types of bridging at the same time.
Port and Protocol VLANs
The IA 1100/1200 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 IA 1100/1200 confines MAC-layer broadcasts to the ports in the
VLAN on which the broadcast originates. IA 1100/1200 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 IA 1100/1200 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
IA 1100/1200s. To simplify VLAN administration, the IA 1100/1200 supports 802.1q trunk
ports, which allow you to use a single port to "trunk" traffic from multiple VLANs to
another IA 1100/1200 or switch which supports 802.1q.
IP Routing
The IA 1100/1200 provides high-speed routing for the Internet Protocol (IP), which is the
protocol switching and routing devices use for moving traffic within the Internet and
within many corporate intranets.
Note:
All other protocols that require routing must be tunneled using IP.
Internet Appliance 1100/1200 Getting Started Guide
Chapter 1: Features Overview
7
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