Spanning-Tree Protocol (STP) loop or misconfiguration causes a Catalyst 5000 to log %MLS-4-MOVEOVERFLOW:Too many moves messages.
Messages similar to the following are output on a Catalyst 5000 switch:
05/13/1998,08:55:10:MLS-4:Too many moves, stop MLS for 5 sec!(20000000)
05/13/1998,08:55:15:MLS-4:Resume MLS after detecting too many moves
These syslog messages indicate that the switch is relearning one or more MAC addresses on multiple ports in rapid succession. For example, on an access switch with two uplinks to the core of the network, the switch might learn a given MAC address first on one uplink and then on the other very rapidly.
Move means a MAC/VLAN in the Content Addressable Memory (CAM ) table changes its port index. Usually, this is caused by the following :
Misconfiguration: For example, two packet streams to two different ports (on the same VLAN) carry the same MAC address. This causes the switch to learn the same MAC/VLAN from two different ports in turns.
STP loops: Loops where the same frame comes and goes between ports. The switch keeps learning the same MAC/VLAN from different ports.
Determine the correct source (port) of the host MAC address.
Issue the show mls notification and show looktable commands to provide the port and mac address information. Sample command output is below.
Cat5k> (enable) show mls notification
1: (0004e8e6-000202ce) Noti Chg TA e8e6 OI 2ce (12/15) V1 !--- Mod/port and VLAN. 2: (0004e8e6-000202cd) Noti Chg TA e8e6 OI 2cd (12/14) V1
In this example, ports 12/15 and 12/14, both in VLAN 1, have the same Table Address (TA) of e8e6. To find the MAC address associated with the table address, issue the show looktable e8e6 command. Sample command output is below.
Hi all, I have a device made by a manufacturer called Crestron that takes PoE plus. I have a pair Catalyst 3850s with stacking cable, and quite a few PoE devices on it, all of them 15.4W, but still far within my PoE budget. My issues is, when I...
Hi! I purchased a UCS-FI-6248UP to use in to connect 2 Storage servers with 5 esxi servers via iSCSI. I wanted a 10GB switch to get up the speed. the servers are connected thru twinax cables. i’m a totaly noob on managed switches and h...
Hello Expert, I tring to convert a Fe lan port to wan port on cisco 892 router. The router that is connect telco provider pppoe device via a switchBoth the switch an pppoe device is supplied by the telco I use the following...
Oct 20, 2020 is an inspirational date for many of us in networking industry to be proud of. It is the birthday of Cisco Catalyst 8500 Series Edge Platforms – one of the most powerful purpose-built SD-WAN Edge platforms ever, making up to 60Gbps throughput...