H3c-technologies H3C SecPath F5020 Manuale Utente Scaricare il pdf (Pagina 55)

Analysis and solution

Possible reasons for the data transmission failure are as follows:

• No route is available. The LAC must have a route to the private network behind the LNS, and vice

versa. Otherwise, data transmission fails. You can use the display ip routing-table command on the

LAC and LNS to check whether the expected routes are present. If not, configure a static route, or

configure a dynamic routing protocol.

• Congestion occurs on the Internet backbone, and the packet loss ratio is high. L2TP data

transmission is based on UDP, which does not provide the packet error control function. If the line

is unstable, the LAC and LNS might be unable to ping each other.

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H3c-technologies H3C SecPath F5020 Manuale Utente Pagina 55