System Management Configuration Guide, Cisco Catalyst IE3x00 Rugged, IE3400 Heavy Duty, and ESS3300 Series Switches

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System Management Configuration Guide, Cisco Catalyst IE3x00 Rugged, IE3400 Heavy Duty, and ESS3300 Series Switches

Restrictions for multiple VLAN support and PTP over DLR

Updated: June 26, 2026

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Consider the limitations and restrictions when using multiple VLAN support and PTP over DLR.

Multiple VLAN support with TC restrictions

Multiple VLAN support with TC has these restrictions:

  • This feature is supported only on Cisco Catalyst IE3400 Rugged Series Switches and Cisco Catalyst IE3400 Heavy Duty Series Switches.

  • DLR is the only Layer 2 redundancy protocol supported.

  • These Layer 2 protocols have not been validated with multi-VLAN TC: REP, Spanning Tree, MRP, PRP, HSR.

PTP mode restrictions on DLR nodes

Only these PTP modes are allowed on DLR primary and backup supervisor or gateway nodes:

  • Boundary clock

  • Transparent clock—multiple VLAN

Transparent clock mode (without multiple VLAN support) is not allowed on DLR primary and backup supervisor or gateway nodes. Transparent clock mode (without multiple VLAN support) can be configured on DLR beacon nodes.

PTP over DLR is not supported for PTP power profiles.

PTP packet processing is restricted exclusively to Layer 3 packets across the DLR ring. You must prevent any leakage of Layer 2 PTP packets into the DLR ring from external networks because such leakage could cause undesirable looping and MAC flapping.