Possible causes of a failure of an interconnection between WDM equipment and a router


The possible causes are as follows:
Possible cause 1: The line between the WDM equipment and the data equipment is faulty.
Possible cause 2: The client-side parameters of the interconnected boards on WDM products are incorrectly configured.
Possible cause 3: An interconnected board is faulty.

Other related questions:
Possible cause of the BUS_ERR alarm reported after WDM equipment is upgraded
If the service mode is incorrectly configured for some boards such as NS2 and TDX, a BUS_ERR alarm will be reported after the upgrade is complete. When a BUS_ERR alarm is reported, verify the line mode.

Interconnection and differences between FEC and AFEC on WDM equipment
AFEC is an enhanced forward error correction function, but FEC is a standard error correction function. The frame structures of the two functions are different and therefore cannot be interconnected.

What are possible causes for L2TP dial-up failures of the AR router
Possible causes for L2TP dialup failures are as follows: - The firewall is configured on the public network or the local PC has the firewall, so L2TP packets are discarded. - When corresponding L2TP port is disabled or occupied, UDP port 1701 is often used. For example, ACL and NAT are configured. - The user name and password of the LAC are incorrect, or no users are specified for the LNS. - The configured address is incorrect. For example, the statically configured address of the VT interface is incorrect. - Tunnel authentication modes are different. - LCP renegotiation is not configured. - The IP address allocation is improper. The IP address pool has a small address range or not configured. - Gateway addresses are not configured in the IP address pool, so gateway addresses are allocated to clients. - There are unreachable routes. - In the L2TP group view, the specified tunnel name at the remote end is incorrect. - The configured authentication domain is incorrect. - L2TP negotiation fails because control packets sent by clients of the local PC do not carry the SQ. - When IPSec encryption is used, the IPSec parameters on the two ends of the tunnel are inconsistent.

Difference between conventional WDM equipment and OTN equipment
Both of them use the DWDM technology. The difference between them lies in that OTN equipment can achieve electrical cross-connection scheduling for various types of services.

Possible causes for a failure to ping an IPv6 address
In V100R002 and later versions, the IPv6 address of a device fails to be pinged due to the following possible causes: l. The physical state or protocol state of the interface is Down. You can run the display ipv6 interface interface-type interface-number command in any view to check the physical state and protocol state of an interface. 2. The switch fails to learn ND entries of the peer device. You can run the display ipv6 neighbors command in any view to check information about ND entries. 3. The link transmission delay is too long. The source device does not receive any Response packet from the destination device within the waiting time, and the ping operation fails. You can run the ping ipv6 -t timeout destination-ipv6-address command in any view to set “-t&rdquo to increase the timeout interval for waiting for Response packets.

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