Filter
Top Products
6-43
Cisco MGX 8850 Multiservice Switch Installation and Configuration
Release 1.1.31, Part Number 78-11223-03 Rev. B0, May 2005
Chapter 6 Card and Service Configuration
Configuring Frame Relay Service
• For remote channel—Specify the slot and port number of the BXM port attached to the MGX 8850
node at the far end. Specify the VPI as the slot number of the remote MGX 8850 FRSM connected
to the BPX 8600 series switch, and specify the VCI as the LCN of the Frame Relay connection at
the remote MGX 8850 node.
• For connection type—Specify ATFST if the ForeSight feature is operating; if ForeSight is not
operating, specify ATFR.
Specify the other addcon command 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 above MCR and PCR formulas are predicated on a relatively small frame size of 100 octets. Smaller
frame sizes can result in worst-case scenarios, as shown in the following table:
The %Util parameter should be set to the same value as that used for the Frame Relay segments of the
connection.
Test Commands for the FRSM Cards
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 (refer to the Cisco MGX
8800 Series Switch 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.
• tstcon checks the integrity of a connection.
• tstdelay measures the round-trip delay on a connection.
• cnftrafficgen enables/disables traffic-generation tests on a per LCN basis. Enter the dsptrafficgen
command to display the traffic-generation test results.
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 octets, the PCR formula becomes PCR=AR * 2/512 cells per sec
For a frame size of 43 octets, the PCR formula becomes PCR=AR * 2/344 cells per sec