■Virtual circuits required.
■MAC addresses that can be held in the device LAN Emulation ARP Table.
When a LAN Emulation Client (LEC) joins an ELAN, up to five control connections may be required before any data is transferred over a separate data connection (VCC). Each time a LEC connects to another LEC a further connection is required. You should keep this in mind when calculating the number of connections you require.
The ATM Module provides the following resources:
■Up to 16 LECs to extend VLANs into the ATM network over ELANs.
■512 Virtual Circuits to/from the ATM network.
■1024 remote MAC Addresses.
The ATM Module supports only 16 LECs, but this does not limit your network to 16 ELANs.
■Are the LAN Emulation services configured correctly?
Is the LAN Emulation service that the LAN Emulation Client (LEC) is going to join configured correctly?
For example, if your network uses a LAN Emulation Client Server (LECS), does the LECS know about the LES, and is the LES active? Have you supplied a valid ELAN name?
Configuring the LECS and LES is outside of the scope of this user guide. Consult the user guide that accompanies the device implementing the LECS or LES.
ATM Connections Within Your Network |
Alternatively, if your LEC will not be using a LECS and is being configured manually, ensure that:
■The LES address that the LEC is using has been correctly entered via the local management screens.
■The LES is active.
For the ATM Module, you can enter these settings using the Port Configuration screen described in “Displaying an ATM Connection”, on page
ATM Connections Within Your Network
ATM connections in your ATM network can be established dynamically by the Signalling protocol (Switched Virtual Circuit), or through management (Permanent Virtual Circuit).
The ATM Module does not support PVC connections. All ATM Module connections are SVCs. This network concepts section includes PVC configuration concepts for completeness.
■Switched Virtual Circuits (SVC) — SVCs are set up dynamically by the signalling protocol. SVCs require very little configuration, and only use the resources you need. For these reasons, SVCs are commonly used in the LAN environment.
■Permanent Virtual Circuits (PVC) — You may need to use a PVC within your network when a remote
