How to check the LDP TCP connections and determine whether TCP connections are normal

The port number for LDP-dedicated TCP connections is 646. Run the display tcp status command. All connections with port number of 646 are LDP TCP connections. In most cases, the server has a Listening port and one or more Established connections. The local port number is 646, and the remote port number is a randomly allocated five-digit numeral. The command output is displayed as follows:
display tcp status
TCPCB Tid/Soid Local Add:port Foreign Add:port VPNID State
0d3bda5c 32 /1 0.0.0.0:23 0.0.0.0:0 14849 Listening
0b6d91cc 23 /2 2.2.2.2:646 1.1.1.1:53585 0 Established

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