Dell SmartFabric OS10 User Guide Release 10.5.3

Delay-restore for orphan ports

The delay-restore feature for non-VLT ports is used to delay the bring up of non-VLT ports; so that, there is enough time available for the protocols and features to converge. If there is no such mechanism available, then traffic may get blocked.

This feature is similar to VLT delay-restore mechanism for VLT port-channels, which is already supported. The delay-restore mechanism is applicable to the following two scenarios:

• VLT peer reload - When the reloaded node joins as a secondary node in the VLT domain or fabric, VLT port-channels are brought up only after delay-restore timer expires.
• VLTi link failure - When the VLT heart beat is configured and is up and running, if VLTi link goes down, the secondary VLT peer brings down its local VLT port-channels. All devices connected to the VLT port-channel interfaces are expected to send or receive traffic through the VLT primary device. When the VLTi link comes back up, the secondary VLT peer does not bring its VLT port-channel up immediately. They are brought up only after VLT delay-restore timer expires, assuming that heart-beat is up.

There are two sets of configurations, one for non-VLT deployments and the other for VLT deployments.

Delay-restore port (DRP for non-VLT deployments)

Delay-restore port is used for non-VLT deployments. The configured ports are kept down on system boot up (after a reload) and are brought up only after the configured delay-restore port timer expires. The VLT delay-restore timer that controls the VLT port-channels also controls the orphan ports.

Delay-restore orphan port (DROP for VLT deployments)

The delay-restore for orphan ports feature extends the support of delay-restore timer for the VLT port-channels to orphan ports. The timer corresponding to the VLT port-channel also control the orphan-ports. When delay-restore orphan port is configured, the orphan port is treated just like VLT port-channels during VLT peer reload and VLTi link failure scenarios.

Restrictions and Limitations

Both delay-restore port and delay-restore orphan port configurations are only supported on physical and port-channel interfaces with the following exceptions:

• VLT port-channels
• VLTi link (VLTi port-channel)
• VLT discovery interfaces (VLTi members)
• Port-channel member ports
• Management port
• FC ports