Chapter 3 System Features
AC 60 Software Features
3-24
255-700-025
PacketStar
™
Access Concentrator 60 User Guide
, Issue 1
Release 6.3.0
Frame Relay-to-ATM Interworking
Any port on the Channelized DS3, Channelized STS-1e, Enhanced DS1,
Enhanced E1, DS3 Frame Relay, and Multi-Serial modules can be used to
connect to a frame relay device.Frame relay-to-ATM interworking is
performed at the network level Frame Relay Forum FRF.5 and at the service
level FRF.8. This allows the
PacketStar™
Access Concentrator to adapt and
concentrate traffic from one frame relay network, and transmit it to other
frame relay or ATM networks. In this way, the Access Concentrator acts as a
gateway between routers, remote dial access servers, IBM SNA equipment,
and other devices configured for frame relay operation.
FRF.5 Encapsulating
Frames
With FRF.5 network level interworking, frames are encapsulated within ATM
cells at the network ingress point and "tunneled" through the ATM network.
At the network egress point, the ATM cell headers are removed and the
frames are reassembled for delivery to a frame relay device.
FRF.8 Converting
Frames
With FRF.8 service level interworking, frames are converted into one or more
ATM cells at the network ingress point. At the network egress point, the ATM
cells are delivered to an ATM device. This conversion is compliant with both
the FRF.8 implementation agreement and the IETF multiprotocol
encapsulation specifications (RFC1490, RFC1483). FRF.8 interworking is
performed at the end of the ATM network that connects to the frame relay
device.
Note:
FRF.5 and FRF.8 are not interoperable and cannot be used at both
sides of a network. You may wish to use an FRF.8 approach for
applications involving interconnectivity between two frame relay
devices because the capabilities of FRF.8 include those which are
available with FRF.5.
Frame Relay-to-Frame-Relay Interworking
In addition to frame relay-to-ATM interworking, it is possible to configure an
Access Concentrator for strictly frame relay operation. A frame relay-to-
frame-relay connection can be made between two ports of an Access
Concentrator if both ports have frame relay capacity. In this case, frame relay
data received by one of the ports is converted to ATM cells for transmission
across the backplane of the Access Concentrator, and then converted back
into frame relay for transmission out of another port.
Integrated Link Management Interface (ILMI)
The integrated link management interface (ILMI) is network management
function that supports bidirectional exchange of ATM interface parameters
between two connected ATM Interface Management Entities (IMEs).
ILMI provides status information and statistics using Simple Network
Management Protocol (SNMP) and a MIB to provide any ATM device with
status and configuration information concerning the virtual path connections
(VPCs), virtual channel connections (VCCs), registered ATM network
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