The MAC address is learned on one switch only. If this is the case, you need to bring up those interfaces.ĭata is not getting forwarded, instead it is being flooded in the presence of a VPC scenario. Alternatively, the outgoing interfaces may be down. The MAC address from a data stream is not learned if there is no path for that data going out of the switch.įor example, the VLAN may not have been enabled on any of the interfaces other than the one on which data is coming in on. No egress path was set for the incoming data traffic. This causes the MAC address not to be listed in the MAC table. MAC address is not learned by the switch. A severity 4 syslog message, STM_LEARNING_OVERLOAD, should have been received.Īfter waiting for 120 seconds, learning is enabled automatically. MAC address learning is disabled due to a learning overload (that is, too many new addresses in a short time). A severity 2 syslog message, STM_LEARNING_RE_ENABLE, should be received. This creates free space for new MAC entries to be learned. A severity 2 syslog message, STM_LIMIT_REACHED, should have been received.Īfter waiting for 180 seconds, the MAC table is flushed and learning is enabled automatically.Īlternatively, wait until some MAC entries are aged out, so that the total learned entries fall below 1500, or enter the clear mac address-table dynamic command to clear out entries. A severity 2 syslog message, STM_LOOP_DETECT, should have been received.Īfter waiting for 180 seconds, learning is enabled automatically. MAC address learning is disabled because of loop detection. This chapter includes the following sections:ĭata is not getting forwarded, instead it is being flooded to all ports of a VLAN. This chapter describes how to identify and resolve problems that can occur with Layer 2 switching in the Cisco Nexus 5000 Series switch. Layer 2 is the Data Link Layer of the Open Systems Interconnection model (OSI model) of computer networking. Nexus 5000 does not have the same VLANs as switch running VTP serverĬonfiguring interface to access port does not allow VLAN to go through Multicast traffic is being flooded in a VPC setup Multicast data traffic not received when host is registered for group Multicast data traffic not received by host Source MAC addresses of IGMP joins are learned Port stuck in STP blocking state with BLK*(Loop_Inc) Port stuck in STP blocking state with BLK*(PVID_Inc) Port stuck in STP blocking state with BLK*(Type_Inc) HIFs go down with the BPDUGuard errDisable messageįWM-2-STM_LOOP_DETECT detected on switch, dynamic learning disabled
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