Licensing Requirements and Limitations for LDT and LBDT
Involved Network Elements
Other network elements are not required.
Licensing Requirements
LDT and LBDT are basic features of a switch and are not under license control.
Version Requirements
Product |
Product Model |
Software Version |
|---|---|---|
S12700 |
S12708, S12712 |
V200R005C00, V200R006C00, V200R007C00, V200R007C20, V200R008C00, V200R009C00, V200R010C00, V200R011C10 |
S12710 |
V200R010C00, V200R011C10 |
|
S12704 |
V200R008C00, V200R009C00, V200R010C00, V200R011C10 |
Feature Limitations of LDT
In V200R008C00 and earlier versions, LDT does not take effect in dynamic VLANs. In V200R008C00 and later versions, the LDT-enabled switch can detect loops in dynamic VLANs, but the Quitvlan action is invalid for dynamic VLANs.
LDT and LBDT cannot be configured simultaneously.
The switch enabled with LDT needs to send a large number of detection packets to detect loops, occupying system resources. Disable LDT if loops do not need to be detected.
LDT performance is lowered when loops occur on multiple interfaces in multiple VLANs. This is due to the limitations of security policies and processing capability of the CPU. The more VLANs and interfaces involved, the lower the performance is, especially the performance of the standby chassis in the cluster. In this case, you need to eliminate the loops manually.
LDT cannot be used with ring network technologies including ERPS, RRPP, SEP, Smart Link, STP, RSTP, MSTP, and VBST. Do not configure ring network technologies on an interface of the LDT-enabled VLAN. If LDT has been enabled globally and a ring network technology needs to be configured on an interface, disable LDT on that interface first.
- The blocked ports of LDT cannot block GVRP packets. To ensure that GVRP runs normally and prevent GVRP loops, do not enable GVRP on the blocked port of LDT.
Feature Limitations of LBDT
In V200R008C00 and earlier versions, LBDT does not take effect in dynamic VLANs. In V200R008C00 and later versions, the LBDT-enabled switch can detect loops in dynamic VLANs, but the Quitvlan action is invalid for dynamic VLANs.
LBDT and LDT cannot be configured simultaneously.
LBDT requires that the device should send a large number of detection packets to detect loops, occupying system resources. Therefore, disable LBDT if loops do not need to be detected.
LBDT cannot be configured on an Eth-Trunk or its member interfaces.
- The blocked ports of LBDT cannot block GVRP packets. To ensure that GVRP runs normally and prevent GVRP loops, do not enable GVRP on the blocked port of LBDT.