3. Troubleshooting Functional Failures in Operation

3.18Communication Failure on IEEE802.3ah/UDLD Function

3.18.1Port Becomes Inactive Due to IEEE802.3ah/UDLD Function

If the port becomes inactive due to IEEE802.3ah/UDLD function, isolate the problem by following failure analysis methods shown in the table below.

Table 3-66: Failure Analysis Method When IEEE802.3ah/UDLD Function Is in Use

No.

Troubleshooting Steps and Command

Action

 

 

 

1

Use the show efmoam command to check the

If "Down(loop)" is displayed in Link status, the network configuration which

 

failure type of the port which becomes inactive

causes L2 loop may be adopted. Review the network configuration.

 

due to IEEE802.3ah/UDLD function.

 

 

If "Down(uni-link)" is displayed in Link status, go to No. 2.

 

 

 

 

 

2

Check that IEEE802.3ah/OAM function is

If not enabled, enable IEEE802.3ah/OAM function in the opposite system.

 

enabled in the opposite system.

 

 

If enabled, go to No. 3.

 

 

 

 

 

3

Execute the show efmoam statistics

If Unstable of Info TLV has been incremented, the configuration inhibited

 

command to check the inhibited configuration

for IEEE802.3ah/UDLD function may be adopted. Check that the physical

 

is not adopted.

port is connected to only one system.

 

 

 

 

 

If Unstable of Info TLV has not been incremented, go to No. 4.

 

 

 

4

Check that the system is directly connected to

If the system is connected through the media converter or hub, review the

 

the opposite system.

network configuration so that it is directly connected to the opposite system.

 

 

If it cannot be avoided to use some relay equipment, use the media converter

 

 

which enables the linkage status to be same at both sides (however, not

 

 

recommended).

 

 

 

 

 

If the system is directly connected to the opposite system, go to No. 5.

 

 

 

5

Execute the show efmoam command to check

If the value of "udld-detection-count" is less than the initial value, the

 

the number of response timeout times for

possibility that the one-way link failure is detected erroneously in spite of no

 

detecting the failure.

actual failure is raised. Change the value of "udld-detection-count."

 

 

 

 

 

If the value of "udld-detection-count" exceeds the initial value, go to No. 6.

 

 

 

6

Check settings of the filter and QoS control.

Control frames (slow-protocol) used by IEEE802.3ah/UDLD function may

 

 

have been discarded by filtering or QoS control.

 

 

See "3.23.1 Checking Filtering/QoS Setting Information" to check for it. If

 

 

there is no problem, go to No. 7.

 

 

 

7

Test the line.

Test the line by referencing "6.1 Testing Line." If there is no problem, go to

 

 

No. 8.

 

 

 

8

Check the cable.

Cable may be defective. Replace the cable used at the port.

 

 

 

Note:

IEEE802.3ah/OAM: OAM protocol specified by IEEE802.3ah.

IEEE802.3ah/UDLD: One-way link failure detection function specific to this system using IEEE802.3ah/OAM.

119

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NEC IP8800/S3600, IP8800/S6600, IP8800/S2400, IP8800/S6700, IP8800/S6300 Communication Failure on IEEE802.3ah/UDLD Function
Page 180 Page 182

IP8800/S6700, IP8800/S3600, IP8800/S6600, IP8800/S6300, IP8800/S2400 specifications

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