mdns probe interval

Function

The mdns probe interval command enables the device to periodically discover services and sets the discovery interval.

The undo mdns probe interval command disables the device from periodically discovering services and deletes the discovery interval.

By default, the device is not enabled to periodically discover services and the discovery interval is not set.

Format

mdns probe interval interval

undo mdns probe interval

Parameters

Parameter	Description	Value
interval	Specifies the discovery interval.	The value is an integer that ranges from 60 to 38400, in seconds.

Views

VLAN view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

This command is used on an mDNS gateway or mDNS relay. The mDNS gateway maintains service information lists of all service provisioning devices on the network. A service information list records the service name, service type, TTL, host name, and IP address of each service. The TTL is provided by a service provisioning device to the mDNS gateway, and represents the aging time of a service. If the mDNS gateway receives mDNS response packets from a service provisioning device within the aging time, the mDNS gateway updates its service information. If the mDNS gateway does not receive mDNS response packets from a service provisioning device within the aging time, the mDNS gateway deletes its service information. If an mDNS gateway already exists on the network, a service provisioning device connected to the network advertises service information to the mDNS gateway through the mDNS relay. If a service provisioning device already exists before an mDNS gateway connects to the network, the service provisioning device does not advertise service information to the mDNS gateway.

If the device works as an mDNS gateway, you can run the mdns probe interval command to enable the periodical service discovery function and set the service discovery interval. The device then sends a service query message at the specified interval, and updates the service information list after receiving a response message from the service provisioning device.

If the device works as an mDNS relay and the mdns probe interval command is run, the device sends a service query message at the specified interval to request available service update in its VLAN, and forwards the response message from the service provisioning device to the mDNS gateway, ensuring that service information lists on the mDNS gateway are updated immediately.

Precautions

When the device as the mDNS gateway and service provisioning device are located on different network segments, the mDNS relay but not the mDNS gateway needs to be configured to periodically update service lists.

Example

# Enable the device to periodically discover services in VLAN 100 and set the discovery interval to 150s.

<HUAWEI> system-view
[HUAWEI] vlan 100
[HUAWEI-vlan100] mdns probe interval 150