Configuring a Bridge
Tunnel and Displaying Status Information
Use the ATM Bridge Tunnel Status and Configuration window to:
Display information about the virtual circuits used by the ATM logical
interface
Display ATM bridge tunnel configuration information
Configure the ATM bridge tunnel
The ATM port (physical interface) on the GS2000 line card supports as many as 16
logical ATM interfaces. Each logical interface can be configured as either an ATM
LAN Emulation Client or a bridge tunnel.
For additional information, refer to ATM Logical Interfaces Established at Startup. |
Configuring an
ATM Bridge Tunnel
A bridge tunnel is a permanent virtual channel
established to provide a simple point-to-point connection between two devices through an
ATM network. A bridge tunnel is established over a Permanent Virtual Circuit (PVC). Each
bridge tunnel requires a separate PVC.
Unlike an ATM LAN Emulation Client (LEC), a bridge tunnel does not require those
elements (LAN Emulation Server, LAN Emulation Configuration Server, and Broadcast and
Unknown Server, for example) otherwise necessary to establish an emulated LAN.
Procedure:
Step |
Action |
1 |
Select the MAC type, either Ethernet or FDDI. Note:
When you change to a different MAC type, you must restart the line card before the new
configuration takes effect. |
2 |
To enable or disable this ATM logical
interface, select enable or disable from the drop-down box next to the Interface field. |
3 |
Set the VPI. The VPI is the Virtual Path
Identifier assigned to the PVC. The VPI is automatically set to 0 for the current
release. |
4 |
Enter the VCI. The VCI is the Virtual
Circuit Identifier assigned to the PVC. By default, the VCI is set to 62. Any
value from 62 through 1022 is allowed. |
5 |
Ensure that the device at the opposite end
of the bridge tunnel is configured to match this configuration. The other device
could be a DIGITAL VNswitch, a GIGAswitch/ATM, or another vendor's ATM switch.
Refer to the appropriate documentation provided by the manufacturer of that device
for configuration instructions. |
Configuring an ATM LAN Emulation Client
(LEC)
Warning: Changing the bridge
tunnel to a LEC erases the current bridge tunnel configuration.
To configure the ATM logical interface as a LAN Emulation Client (LEC),
click Change to LEC, then click the Help button within the ATM LEC Configuration and
Status application window.
Field Descriptions
Status |
MAC Type |
Indicates the type of bridge tunnel
configured on the interface: either Ethernet or FDDI. |
VPI |
Virtual Path Identifier associated with the
virtual circuit used by the bridge tunnel. |
Quality of
Service |
Indicates the Quality of Service class of
the virtual circuit used by the bridge tunnel:
- Class 1 supports Constant Bit Rate Video
- Class 2 supports Variable Bit Rate Video
- Class 3 supports Connection-oriented data transfer
- Class 4 supports Connectionless data transfer
|
BT Status |
Current status of the bridge tunnel, either
Up or Down. |
VCI |
Virtual Circuit Identifier associated with
the virtual circuit used by the bridge tunnel. |
LAN FCS |
Indicates whether a Frame Check Sequence
(FCS) checksum is added to the end of each frame that is transmitted. |
Virtual Circuits |
Ifc |
Logical interface number associated with
the interface. |
VPI |
Lists the Virtual Path Identifier
associated with the interfaces listed in the Ifc column. |
VCI |
Lists the Virtual Circuit Identifers (VCIs)
associated with the interfaces listed in the Ifc column. |
Type |
Indicates the type of virtual circuit used
by the bridge tunnel. Examples are ILMI VC, Signalling VC, LE Control VC, and so
forth. |
S/PVC |
Indicates whether the circuit is a switched
virtual circuit (SVC) or a permanent virtual circuit (PVC). |
ATM Address
|
ATM address of the corresponding logical
interface listed in the Ifc column. |
ATM Bridge Tunnel Configuration |
MAC Type |
Specifies MAC frame types transported
through the bridge tunnel. When set to Ethernet, this field idicates the interface is
configured as an Ethenet bridge tunnel; when set to FDDI, this field indicates the
interface is configured as an FDDI bridge tunnel. |
Interface |
Specifies whether the interface is enabled
or disabled. |
VPI |
Specifies the Virtual Path Identifier
assigned to the PVC over which the bridge tunnel operates. The VPI is always 0. |
VCI (62-1022) |
Specifies the Virtual Circuit Identifier
associated witht the PVC over which the bridge tunnel operates. |
|