Lightweight Loop Detection with Scale

You can configure loop detection on the server-facing Layer 2 interfaces of the leaf devices in an EVPN-VXLAN fabric. This feature can detect the following types of Ethernet loops: A loop between two interfaces with different Ethernet segment identifiers (ESIs). This loop is typically caused by miswiring fabric components. A loop between two interfaces with the same ESI. This loop is typically caused by miswiring a third-party switch to the fabric.

We've added support for monitoring all VLANs on a logical interface with the vlan-id all configuration statement at the [edit protocols loop-detect] hierarchy level. This enhancement detects network loops across multiple VLANs and interfaces, improving network stability and performance.

The following are additional behavioral changes for this feature:

• The revert-interval configuration is not effective for scale loop-detect sessions, making them non-revertive. You must issue the clear loop-detect enhanced interface command to clear the loop condition.
• The receive statistics for loop-detect PDUs does not increment for scale loop-detect sessions during a loop condition.
• Only a 1-second transmit interval is supported for scale loop-detect sessions.