Switching

Does Junos have a loopback detection mechanism like other vendors' LBD (Loopback Detection) protocols?

In a linear topology, suppose I connect a Junos switch to an unmanaged switch using a trunk port. If a loop forms on the unmanaged switch, how can the Junos switch detect this and shut down the port to protect the upstream network?

Essentially, I want the Junos switch to automatically shut down the port if a loop is detected on the downstream (unmanaged) switch.

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VIKRANT GAIKWAD
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I'm not familiar with LBD but it sounds similar to storm control in Junos.

https://www.juniper.net/documentation/us/en/software/junos/security-services/topics/topic-map/using-storm-control-to-prevent-network-outages.html

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Steve Puluka BSEET - Juniper Ambassador
IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP - Retired)
http://puluka.com/home
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Original Message:
Sent: 06-25-2025 06:21
From: VIKRANT GAIKWAD
Subject: LOOP DETECTION mechanism in junos

Does Junos have a loopback detection mechanism like other vendors' LBD (Loopback Detection) protocols?

In a linear topology, suppose I connect a Junos switch to an unmanaged switch using a trunk port. If a loop forms on the unmanaged switch, how can the Junos switch detect this and shut down the port to protect the upstream network?

Essentially, I want the Junos switch to automatically shut down the port if a loop is detected on the downstream (unmanaged) switch.

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VIKRANT GAIKWAD
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