Certain dynamic routing protocols require router IDs. If the router IDs are not specified when you enable the routing protocols, the default global router ID is employed. In this case, you need to reset connections to set up the normal neighbor relationship after you specify the router IDs.
The global router ID to be configured must be different from other router IDs on the network. Generally, the router ID is set to the IP address of an interface on the router.
system-view
router id router-id
By default, the global router ID is not configured.