Specifications

4-30 Cisco MGX 8220 Reference, Release 4.1
Frame Relay Access Service Module
Frame Relay to ATM Conversion
The conversions are Cell Loss Priority, Congestion Indication and PVC Status Management.
Cell Loss Priority
Cell Loss Priority mapping is provided in both directions.
• Frame Relay to ATM Direction
Each Frame Relay/ATM network interworking connection can be configured as one of the
following DE to CLP mapping schemes:
— DE bit in the frame relay frame is mapped to the CLP bit of every ATM cell generated by the
segmentation process.
— CLP is always 0.
— CLP is always 1.
• ATM to Frame Relay Direction
Each Frame Relay/ATM network interworking connection can be configured as one of the
following CLP to DE mapping schemes:
— If one or more ATM cells belonging to a frame has its CLP field set, the DE field of the frame
relay frame will be set.
— No mapping from CLP to DE.
Congestion Indication
Congestion Indication mapping is provided in both directions.
• Frame Relay to ATM Direction
EFCI is always set to 0.
• ATM to Frame Relay Direction
If the EFCI field in the last ATM cell of a segmented frame received is set, then FECN of the frame
relay frame will be set.
PVC Status Management
The management of ATM layer and FR PVC Status Management can operate independently. The
PVC status from the ATM layer will be used when determining the status of the FR PVCs.
User Interface
The Command Line Interface (CLI) permits the adding, configuring, deleting and displaying of
lines, channels, and ports on a FRASM card. In addition, the counters on the card can be displayed
and cleared.
The FRASM command set permits the user to create protocol groups. Protocol groups are specified
as either STUN, BSTUN, BNN, and BAN types. When a group has been created, ports and routes
can be assigned as members of the group. Groups can be configured, displayed and deleted. These
commands affect the entire group thus permitting a number of ports to be configured with one
command rather than having to configure each individually.