3. Troubleshooting Functional Failures in Operation40[When Type displayed is Dot1x]See "3.12.1 Communication Failure on Using IEEE 802.1X."[When Type displayed is Wa]See "3.12.2 Communication Failure on Using Web Authentication."[When Type displayed is Macauth]See "3.12.3 Communication Failure on Using MAC Authentication."• Flooding is executed if the MAC address is not displayed.• IP8800/S6700, IP8800/S6600, and IP8800/S6300:If the communication still has been blocked despite no display appears, check to see if learning is suspended byMAC address learning limitation. In addition, check to see if the threshold in the Storm Control function is not toolow.• IP8800/S3600 and IP8800/S2400:If the communication still has been blocked despite no display appears, check to see if the Suppress Port-to-PortForwarding has been enabled. In addition, check to see if the threshold in the Storm Control function is not too low.(b) Checking MAC address learning limitation [IP8800/S6700] [IP8800/S6600] [IP8800/S6300]Execute the show mac-address-table command with "learning-counter" parameter specified to check theinformation of MAC address learning limitation for the port and the VLAN to be checked.>show mac-address-table learning-counter port 1/1-6Date 2005/09/21 20:00:57 UTCPort counts:6Port Count Maximum Threshold Status1/1 3 - - -1/2 1000 1000 800 Learning1/3 0 - - -1/4 50 60 40 Stop learning <---11/5 45 60 40 Learning1/6 0 60 40 Learning>show mac-address-table learning-counter vlanDate 2005/09/21 20:00:57 UTCVLAN counts:4ID Count Maximum Threshold Status1 3 - - -100 1000 1000 800 Stop learning <---1200 0 - - No learning <---24095 90 100 100 Learning1. MAC address learning is suspended according to the MAC address learning limitation value. Frames from theunlearned source address are discarded without learning the MAC address. However, flooding is executed for framesof VLAN for which MAC address learning is suppressed.2. Suppression of MAC address learning is set. Flooding is executed for received frames.(4) Checking filtering/QoSCertain packets may have been discarded by filtering, or packets may have been discarded through bandwidthmonitoring, discarding control, or shaper of the QoS control. Check to see if the conditions of filtering and QoS controlin the configuration have been set up correctly and if bandwidth monitoring, discarding control, or shaper has been setup appropriately for system operation. For the procedure, see " 3.23.1 Checking Filtering/QoS Setting Information."3.5.2 Failures on Using Spanning TreeIf the spanning tree function is in use and a layer 2 communication failure occurs or the spanning tree operation statusdoes not comply with the network configuration, isolate the problem according to the analysis method listed below. Forthe multiple spanning trees, check for each CIST or MST instance. For example, read the CIST route bridge or the route
