Cabletron Systems 2.2 Manual De Usuario

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Configuring Connections
5-3
ATM Configuration
VPI
Displays the Virtual Path IdentiÞer assigned 
to the connection. Virtual Path IdentiÞers are 
used to group virtual connections, allowing 
for channel trunking between ATM switches. 
Each VPI can be conÞgured to carry many 
different channels (designated by VCIs) 
between two points.
VCI
Displays the Virtual Channel IdentiÞer 
assigned to the connection; allowable values 
are 0 - 1023 for each VPI. Remember, it is the 
combined VPI and VCI designations 
assigned to a channel that creates the 
grouping of virtual connections.
Encapsulation Type
Displays the method used to encapsulate 
LAN packets on the selected circuit. Current 
versions of ATM BRIM Þrmware use 802.3 
VC-based multiplexing for bridging 
protocols (designated VC MUX 802.3 
Bridged); future versions will add support 
for ATM Forum LAN Emulation and 
CabletronÕs SecureFast Switching. You may 
also see some connections assigned a type of 
ÒotherÓ; these are default connections that 
cannot be modiÞed or deleted.
Status
Displays the current administrative status of 
the connection: Enabled or Disabled. For 
current versions of Þrmware, all connections 
are enabled by default, and cannot be 
disabled.
UpTime
Displays the length of time the connection 
has been enabled. 
Configuring Connections
You can use the command buttons (AddDelete or Refresh) at the bottom of the 
Current ATM Connections window to add, modify or delete a Permanent Virtual 
Circuit (PVC) or refresh the window.
Add
Adds a new connection or modiÞes an 
existing one, using the parameters entered in 
the Þelds below the list box. A conÞrmation 
window will appear for additions and 
modiÞcations.