Cabletron Systems 6SSRM-02, Инструкция по установке и эксплуатации, Страница: 19 / 74

Features
Introduction 1-5
• Flow-based bridging – The 6SSRM-02 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 6SSRM-02 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 6SSRM-02 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 6SSRM-02 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 6SSRM-02 confines MAC-layer broadcasts to the ports in the VLAN on which
the broadcast originates. 6SSRM-02 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 6SSRM-02 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
6SSRM-02s. To simplify VLAN administration, the 6SSRM-02 supports 802.1q trunk ports,
which allow you to use a single port to “trunk” traffic from multiple VLANs to another 6SSRM-02
or switch which supports 802.1q.
Routing
The 6SSRM-02 provides high-speed routing for the following protocols:
• Internet Protocol (IP) – the protocol switching and routing devices use for moving traffic
within the Internet and within many corporate intranets.
• Internet Packet Exchange (IPX) – a protocol by Novell used in Netware products.
Note:
All other protocols that require routing must be tunneled using IP.
By default, the 6SSRM-02 uses one MAC address for all interfaces. The 6SSRM-02 can be
configured to have a separate MAC address for each IP interface and a separate MAC address for