6-36
Cisco MGX 8230 Edge Concentrator Installation and Configuration
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001
Chapter6 Card and Service Configuration
Configuring Frame Relay Service
Establishing the BPX 8600-to-BPX 8600 Series Segment
For a three-segment connection, establish a BPX 8600-to-BPX 8600 series (middle) segment. Execute
addcon at one of the BPX 8600 series nodes, as follows.
•For slot and port number, specify slot and port of the BXM connected to MGX 8230 node.
•For VPI and VCI, specify the VPI and VCI at the endpoint on the PXM1.
•For Nodename, use the name of the BPX 8600 series switch at the far end of the connection.
•For Remote Channel, specify the slo t and port number of the BXM port attached to the MGX 8230
node at the far end. Specify the VPI as the slot n um ber of the remote MGX 8230 FRSM connec ted
to the BPX 8600 series switch , an d s pecify VCI as the LCN of the Fra m e Re lay connection at the
remote MGX 8230 node.
•Specify the type of connection. Enter ATFST if the ForeSight feature is operating and ATFR if this
feature is not operating.
Specify the other addcon bandwidth parameters such as MCR, PCR, %Util, and so on.
•Minimum Cell Rate (MCR) is on l y u sed w i th th e ForeSight feature (ATFST connections).
•MCR and Peak Cell Rated (PCR) should be specified according to the following formulae.
•MCR=CIR *3/800 cells per second.
•PCR=AR * 3/800 cells per second but less than or equal to 6000.
AR=Frame Relay port speed in bps. For example,
The preceding MCR and PCR formulae are predicated on a relatively small frame s ize of 100 octets, and
even smaller frame sizes can result in worst - case scenarios. For example:
% Util should be set to the sa m e valu e as th at use d for the Frame Relay segmen ts o f th e co nn ect io n .
Test Commands for the FRSMs
To check the state of cards, lines, ports, queues, and connections, use the d isplay commands (dsp...) and
addchanloop. The following commands are available for tes tin g th e FRS M s ( s ee th e Cisco MGX 8800
Series Command Referen ce for descriptions):
•addlnloop, cnflnloop, and dellnloop are line-level, diagnostic c om m an ds th at re qu i re th e se rvice
level user privilege.
•addchanloop and delchanloop are standard user commands for looping o n a cha nne l .
AR equals 64K, PCR=237, or
AR speed equals 256K, PCR=950, or
AR speed equals 1536K, PCR=5703
For a frame size of 64 octects the P CR f orm u la
becomes: PCR=AR * 2/512 cells per
sec
For a frame size of 43 octects the P CR f orm u la
becomes: PCR=AR * 2/344 cells per
sec