A user on an AR waits for a long time to obtain an IP address through DHCP

When the AR is used as the user access device (the WAN uplink interface connects to the Internet and the LAN downlink interface connects to the intranet), STP is enabled by default. After a user connects to an AR, the interface is in Discarding state in the first 30s. DHCP Request messages are discarded. After 30s, DHCP messages can be exchanged.
You are advised to enable STP to prevent network flapping caused by STP convergence.

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