Cabletron Systems 9E312 사용자 설명서
9E312/9E423 Module Bridging
3-2
An Overview of Remote Bridge Management
In Source Route bridging, the source node sends “explorer” packets to a
destination node that pass through a bridged network. Each bridge that sees the
explorer packet will append Routing Information (in the form of LAN segment
numbers) to it. When the destination node receives these explorer packets, it will
return a response to the source node that contains the route information field
indicating which bridge paths the explorer packets took. In future communication
between the two nodes, the original source node will append the best route to the
destination node in a Routing Information Field (RIF) of its data frames, so that a
bridge on the network will simply have to examine the RIF to verify whether it is
a part of the route process.
destination node that pass through a bridged network. Each bridge that sees the
explorer packet will append Routing Information (in the form of LAN segment
numbers) to it. When the destination node receives these explorer packets, it will
return a response to the source node that contains the route information field
indicating which bridge paths the explorer packets took. In future communication
between the two nodes, the original source node will append the best route to the
destination node in a Routing Information Field (RIF) of its data frames, so that a
bridge on the network will simply have to examine the RIF to verify whether it is
a part of the route process.
More on Transparent Bridging
Transparent bridges are most common in Ethernet networks. Individual
Transparent bridges monitor packet traffic on attached network segments to learn
their network segment location in terms of which bridge port receives packets
originated from a particular station (determined via the packet’s Source Address
field). This information gets stored in the bridge’s Filtering Database. When in the
Forwarding state, the bridge compares a packet’s destination address to the
information in the Filtering Database to determine if the packet should be
forwarded to another network segment or filtered (i.e., not forwarded). A bridge
filters a packet if it determines that the packet’s destination address exists on the
same side of the bridge as the source address.
Transparent bridges monitor packet traffic on attached network segments to learn
their network segment location in terms of which bridge port receives packets
originated from a particular station (determined via the packet’s Source Address
field). This information gets stored in the bridge’s Filtering Database. When in the
Forwarding state, the bridge compares a packet’s destination address to the
information in the Filtering Database to determine if the packet should be
forwarded to another network segment or filtered (i.e., not forwarded). A bridge
filters a packet if it determines that the packet’s destination address exists on the
same side of the bridge as the source address.
Transparent bridges in a network communicate with one another by exchanging
Bridge Protocol Data Units, or BPDUs, and collectively implement a Spanning
Tree Algorithm (STA) to determine the network topology, to ensure that only a
single data route exists between any two end stations, and to ensure that the
topology information remains current.
Bridge Protocol Data Units, or BPDUs, and collectively implement a Spanning
Tree Algorithm (STA) to determine the network topology, to ensure that only a
single data route exists between any two end stations, and to ensure that the
topology information remains current.
An Overview of Remote Bridge Management
With SPECTRUM Element Manager, you can view and manage bridging across
the 9E312/9E423 Module — and at each bridging interface — by using the
following windows:
the 9E312/9E423 Module — and at each bridging interface — by using the
following windows:
•
The Bridge Status window provides you with basic information about the
current status of the 9E312/9E423 Module’s bridging interfaces, and allows
you to enable or disable bridging at each interface of the switch. The Bridge
Status window also lets you access further windows to configure bridging at
the 9E312/9E423 Module.
current status of the 9E312/9E423 Module’s bridging interfaces, and allows
you to enable or disable bridging at each interface of the switch. The Bridge
Status window also lets you access further windows to configure bridging at
the 9E312/9E423 Module.
•
The Performance Graph and Interface Statistics windows graphically display
the traffic passing between bridged networks, and let you compare and
contrast traffic processed by each interface.
the traffic passing between bridged networks, and let you compare and
contrast traffic processed by each interface.