Appendix B: Troubleshooting Commands - Extreme Networks ExtremeWare XOS Command Reference Manual

B Troubleshooting Commands
If you encounter problems when using your switch, ExtremeWare XOS provides troubleshooting
commands. Use these commands only under the guidance of Extreme Networks technical personnel.
This appendix describes commands for troubleshooting your switch, including:
Running diagnostics and displaying diagnostic test results
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Enabling and disabling the standalone Extreme Loop Recovery Protocol (ELRP) client
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Enabling and disabling debug mode for Event Management System (EMS) components
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You can contact Extreme Networks Technical Support at (800) 998-2408 or (408) 579-2826.
Extreme Loop Recovery Protocol
ExtremeWare XOS 11.1 introduced support for the Extreme Loop Recovery Protocol (ELRP). ELRP is a
feature of ExtremeWare XOS that allows you to prevent, detect, and recover from Layer 2 loops in the
network. You can use ELRP with other protocols such as the Extreme Standby Router Protocol (ESRP)
and the Ethernet Automatic Protection Switching Protocol (EAPS).
A switch running ELRP transmits multicast packets with special MAC destination address out of some
or all of the ports belonging to a Virtual LAN (VLAN). All the other switches in the network treat this
packet as a regular, multicast packet and flood it to all the ports belonging to the VLAN. If the packets
transmitted by a switch are received back by that switch, this indicates a loop in the Layer 2 network.
Standalone ELRP gives you the ability to send ELRP packets, either periodically or on an ad hoc "one-
shot" basis on a specified subset of VLAN ports. If any of these transmitted packets is received back
then standalone ELRP can perform a configured action such as sending a log message to the system log
file or sending a trap to the SNMP manager.
Standalone ELRP allows you to:
Configure ELRP packet transmission on specified VLANs.
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Specify some or all the ports of VLAN for packet transmission.
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NOTE
Reception of packets is not limited to any specific ports of the VLAN and cannot be configured.
Configure transmission of ELRP packets on specified ports of a VLAN periodically with the added
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ability to configure the interval between consecutive timings.
Save and restore standalone ELRP configuration across reboots.
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ExtremeWare XOS 11.3 Command Reference
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