Configuring the DR Switchover Delay
Context
When an interface on a shared network segment changes from a designated router (DR) to a non-DR, PIM devices on the network segment immediately delete the related multicast forwarding entries. This causes loss of multicast data in a short period. To avoid such a situation, enable DR switching delay function and set a delay time. When the DR changes, the original multicast forwarding entries are retained within the delay time.
Procedure
- Run system-view
The system view is displayed.
- Run interface interface-type interface-number
The interface view is displayed.
- (Optional) On an Ethernet interface, run undo portswitch
The interface is switched to Layer 3 mode.
By default, an Ethernet interface works in Layer 2 mode.
Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support switching between Layer 2 and Layer 3 modes.
- Run pim timer dr-switch-delay interval
The DR switchover delay function is enabled and a delay time is configured.
By default, when the interface changes from a DR to a non-DR, the interface stops forwarding data immediately.