Extreme Networks ExtremeWare XOS Command Reference Manual page 1235

ExtremeWare XOS 11.5 supports only the Summit X450 family of switches and the BlackDiamond 8800 series switch.
The domain ID must be identical on all switches (ESRP-enabled or ESRP-aware) participating in
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ESRP for that particular domain.
If you have an untagged master VLAN, you must specify an ESRP domain ID.
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If you have a tagged master VLAN, ESRP uses the 802.1Q tag (VLANid) of the master VLAN for
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the ESRP domain ID. If you do not use the VLANid as the domain ID, you must specify a
different domain ID.
Extreme Loop Recovery Protocol
ExtremeWare XOS 11.1 introduces 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 ESRP.
With ELRP, each switch, except for the sender, treats the ELRP PDU as a Layer 2 multicast packet. The
sender uses the source and destination MAC addresses to identify the packet it sends and receives.
When the sender receives its original packet back, that triggers loop detection and prevention. Once a
loop is detected, the loop recovery agent is notified of the event and takes the necessary actions to
recover from the loop. ELRP operates only on the sending switch; therefore, ELRP operates
transparently across the network.
Details of using the standalone ELRP client are discussed in the ExtremeWare XOS User Guide chapter,
"Troubleshooting," and the commands used to configure standalone ELRP are described in
B, "Troubleshooting Commands."
ExtremeWare XOS 11.5 Command Reference Guide
Extreme Loop Recovery Protocol
Appendix
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