Cisco MGX 8230 Specifications download pdf (Page 204)

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Cisco MGX 8230 Edge Concentrator Installation and Configuration

Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001

Chapter 6 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 slot and port number of the BXM port attached to the MGX 8230

node at the far end. Specify the VPI as the slot number of the remote MGX 8230 FRSM connected

to the BPX 8600 series switch, and specify VCI as the LCN of the Frame Relay 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 only used with the 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 size of 100 octets, and

even smaller frame sizes can result in worst-case scenarios. For example:

% Util should be set to the same value as that used for the Frame Relay segments of the connection.

Test Commands for the FRSMs

To check the state of cards, lines, ports, queues, and connections, use the display commands (dsp...) and

addchanloop. The following commands are available for testing the FRSMs (see the Cisco MGX 8800

Series Command Reference for descriptions):

• addlnloop, cnflnloop, and dellnloop are line-level, diagnostic commands that require the service

level user privilege.

• addchanloop and delchanloop are standard user commands for looping on a channel.

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 PCR formula

becomes:

PCR=AR * 2/512 cells per

sec

For a frame size of 43 octects the PCR formula

becomes:

PCR=AR * 2/344 cells per

sec

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