Hardware-Assisted Extreme Loop Recovery Protocol (ELRP)

Extreme Loop Recovery Protocol (ELRP) is a proprietary protocol that acts as a tool to detect network loops at Layer 2. ELRP sends a special protocol data unit (PDU) over the VLAN and detects a loop if the sender switch receives the same PDU back.

This enhancement to ELRP adds support for hardware-assisted ELRP, which allows ELRP to detect loops faster and to support more ELRP clients.

Supported Platforms

Summit X450-G2, X460-G2, X670-G2, and ExtremeSwitching X440-G2, X465, X590, X620, X690, X870 series switches.

Limitations

For hardware-assisted ELRP:

Only front panel ports can be configured as the loopback port.
Only disabling ingress port is supported after a loop is detected.
MLAG ports are not supported.
Software ELRP and hardware-assisted ELRP cannot operate simultaneously.
Only standalone clients are supported.
Not supported on dynamic VLANs.
Maximum loop detection interval is determined by the hardware capability of each platform. For most platforms, an ELRP packet is 70 bytes.
Non-periodic requests are not supported.
Extended Edge Switching is not supported.

New CLI Commands

configure elrp-client hardware-assist loopback-port [port | none]

Changed CLI Commands

Changes are underlined.

enable elrp-client {software | hardware-assist}

The following show command now displays hardware-assisted ELRP information:

show elrp

Published August 2019prev | next

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