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Table Of Contents
Appendix A: SGSN D-Node Commands
Appendix A: SGSN D-Node Commands
The commands in this section are for certain operator-specific, SGSN D-node implementations only. These commands are not to be used for any other type of standard, SGSN-related configuration, or to configure any GGSN services.
clear gprs isgsn statistics
To clear the current GPRS intra-Serving GPRS Support Node (iSGSN) statistics, use the clear gprs isgsn statistics privileged EXEC command (SGSN D-node only).
clear gprs isgsn statistics
Syntax Description
This command has no arguments or keywords.
Defaults
No default behavior or values.
Command Modes
Privileged EXEC
Command History
12.1(1)GA
This command was introduced.
12.1(3)T
This command was integrated in Cisco IOS Release 12.1(3)T.
Usage Guidelines
Use the clear gprs isgsn statistics command to clear the current GPRS iSGSN statistics. This command clears the counters that are displayed by the show gprs isgsn statistics command.
Examples
The following example clears the current GPRS iSGSN statistics:
router# clear gprs isgsn statisticsclear l2relay statistics
To clear the Layer 2 Relay (l2relay) statistics for the SGSN, use the clear l2relay statistics privileged EXEC command (SGSN D-node only).
clear l2relay statistics
Syntax Description
This command has no arguments or keywords.
Defaults
No default behavior or values.
Command Modes
Privileged EXEC
Command History
12.1(1)GA
This command was introduced.
12.1(3)T
This command was integrated in Cisco IOS Release 12.1(3)T.
Usage Guidelines
Use the clear l2relay statistics command to clear the current l2relay statistics.
Examples
The following example clears the l2relay statistics:
router# clear l2relay statisticsRelated Commands
clear l2relay topology-map
To clear the Layer 2 Relay topology map for the SGSN, use the clear l2relay topology-map privileged EXEC command (SGSN D-node only).
clear l2relay topology-map
Syntax Description
This command has no arguments or keywords.
Defaults
No default behavior or values.
Command Modes
Privileged EXEC
Command History
12.1(1)GA
This command was introduced.
12.1(3)T
This command was integrated in Cisco IOS Release 12.1(3)T.
Usage Guidelines
The SGSN module maintains a l2relay topology map that the router uses to keep a list of the unit IDs (UIDs) of the SGSN-datacom (SGSN-D) and SGSN-telecom (SGSN-T) units with which it can communicate. UIDs are added to the topology map when the router receives self-ID packets from SGSN-D and SGSN-T units on the network.
For debugging purposes, it may be useful to clear the Layer 2 Relay topology map. Using the clear l2relay topology-map command clears all of the data structures in the list of SGSN units so that the list can be rebuilt.
Normally you will not need to use this command. If problems with the SGSN are encountered, Cisco technical support personnel may request that you clear the Layer 2 Relay topology map.
Examples
The following example clears the l2relay topology map for the SGSN:
router# clear l2relay topology-mapRelated Commands
l2relay echo-interval
To specify the interval at which the SGSN sends l2relay keepalive messages, use the l2relay echo-interval global configuration command. To restore the default value for the echo interval (10 seconds) use the no form of the command (SGSN D-node only).
l2relay echo-interval seconds
no l2relay echo-interval
Syntax Description
seconds
The length of the echo interval, in seconds. Specify a value between 1 and 360 seconds. The default is 10 seconds.
Defaults
10 seconds
Command Modes
Global configuration
Command History
12.1(1)GA
This command was introduced.
12.1(3)T
This command was integrated in Cisco IOS Release 12.1(3)T.
Usage Guidelines
Use the l2relay echo-interval command to specify the interval at which the SGSN sends Layer 2 Relay keepalive messages.
The SGSN module uses the proprietary l2relay protocol in conjunction with the intra-Serving GPRS Support Node (iSGSN) protocol for communication between the SGSN-datacom (SGSN-D) and SGSN-telecom (SGSN-T) units that comprise the SGSN. Each SGSN-D or SGSN-T unit periodically sends out keepalive messages (echo requests) to the other SGSN units to inform them that it is functioning. You can fine-tune the performance of the nodes that comprise the SGSN by adjusting the echo interval value.
To restore the default value for the echo interval (10 seconds) use the no form of the command.
Examples
The following example shows an interval of 15 seconds between Layer 2 Relay keepalive messages:
l2relay echo-interval 15l2relay flow-control
To specify quench threshold and resume threshold percentages that determine when the l2relay protocol begins and ends flow control processing, use the l2relay flow-control global configuration command. To restore the default values for flow control processing, use the no form of the command (SGSN D-node only).
l2relay flow-control {enable | quench-threshold | resume-threshold}
no l2relay flow-control
Syntax Description
Defaults
The default value for the quench-threshold argument is 80.
The default value for the resume-threshold argument is 20.
Command Modes
Global configuration
Command History
12.1(1)GA
This command was introduced.
12.1(3)T
This command was integrated in Cisco IOS Release 12.1(3)T.
Usage Guidelines
If you have enabled Layer 2 Relay flow-control processing using the l2relay flow-control enable command, you can use the l2relay flow-control command to specify congestion percentages that trigger flow control processing or resumption of normal Layer 2 Relay processing.
The quench-threshold argument specifies the congestion percentage that must be reached before flow-control processing begins. For example, if you specify 60 for the quench-threshold argument, then the SGSN initiates flow control when Layer 2 Relay processing becomes 60% congested.
The resume-threshold argument specifies the congestion percentage that must be reached before normal Layer 2 Relay processing is resumed. For example, if you specify 40 for the resume-threshold argument, then the SGSN resumes normal Layer 2 Relay processing when the congestion percentage decreases to 40%.
Examples
In the following example, 60 is specified for the quench-threshold argument:
l2relay flow-control quench-threshold 60l2relay pilot-uid
To specify the unit ID of an SGSN-T node to which packets with unknown destination information are transmitted, use the l2relay pilot-uid global configuration command. To delete the pilot UID, use the no form of the command (SGSN D-node only).
l2relay pilot-uid uid
no l2relay pilot-uid
Syntax Description
Defaults
0xFF (invalid UID)
Command Modes
Global configuration
Command History
12.1(1)GA
This command was introduced.
12.1(3)T
This command was integrated in Cisco IOS Release 12.1(3)T.
Usage Guidelines
Each router that is running an SGSN module is assigned a unit ID as part of SGSN configuration. In the event that a packet comes in for an unknown SGSN, the receiving SGSN sends the packet to a unit designated as the "pilot" SGSN-T unit. Use the l2relay pilot-uid command to specify the SGSN-T unit to which packets with unknown destination information are transmitted.
Examples
l2relay uid 5l2relay pilot-uid 3l2relay use-interface
To specify the physical interfaces used by the l2relay protocol running on the SGSN, use the l2relay use-interface global configuration command (SGSN D-node only).
l2relay use-interface interface_1 [interface_2]
Syntax Description
interface_1
Interface that is used by the Layer 2 Relay protocol.
interface_2
A secondary interface that can be used by the Layer 2 Relay protocol.
Defaults
No default behavior or values.
Command Modes
Global configuration
Command History
12.1(1)GA
This command was introduced.
12.1(3)T
This command was integrated in Cisco IOS Release 12.1(3)T.
Usage Guidelines
Use the l2relay use-interface command to specify one or more interfaces that the Layer 2 Relay protocol uses to communicate with the SGSN-T and SGSN-D units that comprise the SGSN.
Examples
The following example shows the configuration for a Fast Ethernet interface (FastEthernet3/0) and the l2relay use-interface command that specifies use of that interface.
interface FastEthernet3/0ip address 5.0.0.55 255.0.0.0no ip directed-broadcastno ip mroute-cacheno keepalive!l2relay use-interface FastEthernet3/0show gprs isgsn statistics
To display statistics that show the status of the intra-Serving GPRS Support Node running on the router, use the show gprs isgsn statistics privileged EXEC command (SGSN D-node only).
show gprs isgsn statistics
Syntax Description
This command has no keywords or arguments.
Defaults
No default behavior or values.
Command Modes
Privileged EXEC
Command History
Usage Guidelines
The processing nodes that comprise the SGSN communicate using the proprietary iSGSN Protocol. Each SGSN component running on a Cisco 7200 series router maintains statistical information about the status of the service. Use the show gprs isgsn statistics command to display status information about the iSGSN Protocol.
Examples
The following example shows output from the show gprs isgsn statistics command:
router# show gprs isgsn statisticsInput Packets: 16 Bytes: 864Output Packets: 16 Bytes: 752Input Drops: 4 Out Drops: 0Out Errors: 0 Local Rejected PDPs: 0Table 32 describes the fields shown in the display.
Related Commands
Displays statistics that show the status of the Layer 2 Relay Protocol running on the SGSN.
show l2relay statistics
To display statistics that show the status of the Layer 2 Relay Protocol running on the SGSN, use the show l2relay statistics privileged EXEC command (SGSN D-node only).
show l2relay statistics
Syntax Description
This command has no keywords or arguments.
Defaults
No default behavior or values.
Command Modes
Privileged EXEC
Command History
12.1(1)GA
This command was introduced.
12.1(3)T
This command was integrated in Cisco IOS Release 12.1(3)T.
Usage Guidelines
Use the show l2relay statistics command to display statistical and other information about the Layer 2 Relay protocol running on the SGSN, including the following information:
•
Layer 2 Relay Protocol configuration and performance
•
•
Examples
The following example shows output from the show l2relay statistics command:
router# show l2relay statisticsl2relay uid = 3 unit-type = Dl2relay echo-time = 10 flow control enable = 1l2relay reset_value = 164 l2rly_pak_drop = 0l2relay_inputQ len = 0 l2relay_mgmtQ len = 0l2relay_flow_quench at 80 % resume at 20 %l2relay pilot_uid = 1l2relay topology:-----------------------------------------------------------------FastEthernet3/0Type UID mac_address1 Tx/Rx mac_address2 Tx/Rx Cngst OQlenD 3 0050.2a53.0854 1/1 0000.0000.0000 0/0 0 0T 1 0040.05a2.26cb 1/1 0000.0000.0000 0/0 0 0l2relay accounting:------------------------------------------------------------Type UID Byte_out/Pak_out Byte_in/Pak_inD 3 16936/542 0/0T 1 0/0 0/0Table 33 describes the fields shown in the first part of the display.
The second part of the output from show l2relay statistics shows Layer 2 Relay topology information about each SGSN unit that is running.
Table 34 describes the fields shown in the l2relay topology section of the display.
The last part of the output from the show l2relay statistics command shows Layer 2 Relay accounting information for each SGSN unit.
Table 35 describes the fields shown in the l2relay accounting section of the display.
Posted: Sun Mar 27 23:53:43 PST 2005
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