![]() Troubleshooting Loop Detection Error MessageĬisco Nexus 3000 Series switches leverage L2FM for software MAC learning (and, subsequently, loop detection). I'm not entirely sure if the OSPF problem is related to the loop issue, or why either of them are happening at this point. I've turned on debugging for OSPF but I don't seem to be getting any messages through for it. ![]() The rest of the adjacencies between the switches are all fine.Ĭhecking out some troubleshooting steps for OSFP they all suggest turning on debugging and looking for issues there, like mismatched MTU. The CORE-01 switches are in EXCHANGE/DROTHER and EXSTART/BDR with each other, and CORE-02 switches are EXSTART/DROTHER, EXSTART/DR. The site is running OSFP across a couple of VLANs across all 4 cores, and during initial troubleshooting I've noticed that four Vlan15 adjacencies are stuck in an EXSTART or EXCHANGE state, despite the config being identical. The MAC addresses are all of the addresses on the Vlan SVIs. Eth1/45 is one of the L2 links to the other site's vPC primary. ![]() The odd thing is it's "among ports Eth1/43 and Eth1/45" and Eth1/43 is an unused port, no config, no transceiver plugged in. The switch is SITE2-CORE-02 in the diagram below. I'm seeing intermittent "%L2FM-2-L2FM_MAC_FLAP_DISABLE_LEARN_N3K: Loops detected in the network for mac" errors on a Nexus 3548 (on 9.3(9)), in a vPC pair, connected to another vPC pair directly via L2 at another site.
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