Cisco Systems MGX 8230 manual ATM Funi features, Frame Forwarding Features

Chapter 2 Module and Service Descriptions

Frame Relay Service Modules

•Frame Relay-to-ATM network interworking (FRF.5) and Frame Relay-to-ATM service interworking (FRF.8), both transparent and translation modes, configured on a per-permanent virtual circuit (PVC) basis.

•Standards-based CIR policing and DE tagging/discarding.

•End-to-end ForeSight® rate-based flow control option.

•Capability to extend ForeSight closed-loop congestion management between two Cisco networks across Frame Relay-UNI or Frame Relay-NNI using ANSI T1.618 consolidated link-layer management (CLLM) messages.

•Support for high-priority, rt-VBR, nrt-VBR, VBR, and ABR-ForeSight QoS.

•Standard ABR (TM 4.0 compliant).

Note Note: the Foresight option is not available on MGX-FRSM-HS1/B.

ATM FUNI features

•ATM Forum FUNI mode 1A supported.

•Interpreted CCITT-16 CRC at end of the frame (frame discard if in error).

•AAL5 mapping of user payload to ATM.

•Supports 16 VPI values (15 plus the zero VPI); supports virtual path connections (VPCs) for all nonzero VPI values (up to 15 VPCs).

•Supports 64 VCI value.s

•Supports OAM frame/cell flows.

•Standards-based usage parameter control.

•Support for high-priority, rt-VBR, nrt-VBR, VBR, and ABR-ForeSight QoS.

•Standard ABR (TM 4.0 compliant).

Note Note: the Foresight option is not available on MGX-FRSM-HS1/B.

Frame Forwarding Features

•No assumptions made on the frame header format.

•Interpreted CCITT-16 CRC at end of the frame (with frame dropping on an error).

•If a connection is set up, all frames are routed to/from that connection; otherwise the frame is discarded.

•No translation/mapping attempted between frame header bits and ATM layer EFCI and DE bits.

•A single set of Frame Relay traffic access parameters (for example, CIR) is configured for the logical port in frame-forwarding mode; all arriving frames are treated as if they arrived without a set DE bit; if the frame is determined to exceed the committed rate (exceeding CIR), the CLP of all cells associated with that frame are set to indicate low priority; if the frame exceeds the total rate allowed for committed and uncommitted traffic, the frame is discarded.

•Support for high-priority, rt-VBR, nrt-VBR, VBR, and ABR-ForeSight QoS.

	Cisco MGX 8230 Edge Concentrator Installation and Configuration
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001		2-21