MAC_MOVE logs seen on MLAG/ LACP switch setup

Hi all,

We have two N2024 switches setup in an MLAG, both are uplinked to our core switches and a Xen server setup in LACP connected to each of the switches using a port-channel.

We are experiencing network issues with the VMs on Xen and the switches are showing lots of "MAC_MOVE" messages.

Xen bond mode:

Is seeing the MAC_MOVE messages indicative of a setup issue? I've attached a sample of the log below as well as our switch config, any help would be much appreciated!

Log sample:

Key:
aaaa.aaaa.aaaa = VM1
bbbb.bbbb.bbbb = VM2

Line 6: <189> Feb 21 09:31:14 CSW0056-1 FDB[dtlAddrTask]: fdb.c(584) 198364 %% NOTE MAC_MOVE: Mac aaaa.aaaa.aaaa in VLAN: 1 is overwritten from entryType 1 to 1and port Te1/0/1 to Po3
Line 11: <189> Feb 21 09:31:11 CSW0056-1 FDB[dtlAddrTask]: fdb.c(584) 198359 %% NOTE MAC_MOVE: Mac aaaa.aaaa.aaaa in VLAN: 1 is overwritten from entryType 1 to 1and port Po3 to Te1/0/1
Line 18: <189> Feb 21 09:31:05 CSW0056-1 FDB[dtlAddrTask]: fdb.c(584) 198352 %% NOTE MAC_MOVE: Mac bbbb.bbbb.bbbb in VLAN: 1 is overwritten from entryType 1 to 1and port Te1/0/1 to Po3
Line 22: <189> Feb 21 09:31:01 CSW0056-1 FDB[dtlAddrTask]: fdb.c(584) 198348 %% NOTE MAC_MOVE: Mac bbbb.bbbb.bbbb in VLAN: 1 is overwritten from entryType 1 to 1and port Po3 to Te1/0/1

Config:

!Current Configuration:
!Software Capability "Stack Limit = 8, VLAN Limit = 1024"
!Image File "N3000AdvLitev6.5.4.4"
!System Description "Dell EMC Networking N3024, 6.5.4.4, Linux 3.6.5-e3cd5a07, Not Available"
!System Software Version 6.5.4.4
!
configure
vlan 30
exit
ip telnet server disable
hostname "Switch-1"
slot 1/0 1 ! Dell EMC Networking N3024
slot 1/1 6 ! Dell EMC N3000 SFP+ Card
sntp unicast client enable
sntp server x.x.x.x
clock timezone 0 zone "BST"
stack
member 1 1 ! N3024
exit
interface out-of-band
ip address x.x.x.x y.y.y.y z.z.z.z
exit
no ip domain-lookup
logging x.x.x.x
exit
interface vlan 1
exit
username "admin" password xxxxxxxxxxxxxxxxxxx privilege 1 encrypted
line ssh
exec-timeout 360
exit
ip ssh server
no isdp enable
no isdp advertise-v2
spanning-tree mode rapid-pvst
spanning-tree vlan 1 priority 57344
!
interface Gi1/0/1
channel-group 3 mode active
description "xxx"
exit
!
interface Gi1/0/23
channel-group 1 mode active
description "MLAG_Peer_Link"
exit
!
interface Gi1/0/24
channel-group 1 mode active
description "MLAG_Peer_Link"
exit
!
interface Te1/0/1
description "Uplink"
exit
!
interface port-channel 1
description "MLAG_Peer_Link"
spanning-tree disable
switchport mode trunk
vpc peer-link
exit
!
interface port-channel 3
description "xxx"
vpc 3
exit
!
snmp-server engineid local xxxxxxxxxxxxxxx
no snmp-server enable traps
snmp-server community "xxxxxxxxx" ro
enable password xxxxxxxxxxxxxxxx encrypted
banner exec "
"
banner login "xxxxxxxxxxxx"
feature vpc
vpc domain 1
role priority 1
peer-keepalive enable
peer-keepalive destination x.x.x.x source x.x.x.x
peer detection enable
exit
eula-consent support-assist reject
eula-consent hiveagent reject
exit

Hi all,

(Firstly sorry about the lack of logs/ config and images - my post keeps getting marked as spam... helpful)

We have two N3024 switches setup in an MLAG, both are uplinked to our core switches and a Xen server setup in LACP connected to each of the switches using a port-channel.

We are experiencing network issues with the VMs on Xen and the switches are showing lots of "MAC_MOVE" messages. 

Is seeing the MAC_MOVE messages indicative of a setup issue? I've attached a sample of the log below as well as our switch config, any help would be much appreciated!

Log sample:

Key:
aaaa.aaaa.aaaa = VM1
bbbb.bbbb.bbbb = VM2

Line 6: <189> Feb 21 09:31:14 Switch-1 FDB[dtlAddrTask]: fdb.c(584) 198364 %% NOTE MAC_MOVE: Mac aaaa.aaaa.aaaa in VLAN: 1 is overwritten from entryType 1 to 1and port Te1/0/1 to Po3
Line 11: <189> Feb 21 09:31:11 Switch-1 FDB[dtlAddrTask]: fdb.c(584) 198359 %% NOTE MAC_MOVE: Mac aaaa.aaaa.aaaa in VLAN: 1 is overwritten from entryType 1 to 1and port Po3 to Te1/0/1
Line 18: <189> Feb 21 09:31:05 Switch-1 FDB[dtlAddrTask]: fdb.c(584) 198352 %% NOTE MAC_MOVE: Mac bbbb.bbbb.bbbb in VLAN: 1 is overwritten from entryType 1 to 1and port Te1/0/1 to Po3
Line 22: <189> Feb 21 09:31:01 Switch-1 FDB[dtlAddrTask]: fdb.c(584) 198348 %% NOTE MAC_MOVE: Mac bbbb.bbbb.bbbb in VLAN: 1 is overwritten from entryType 1 to 1and port Po3 to Te1/0/1

Hi all,

(Firstly sorry about the lack of logs/ config and images - my post keeps getting marked as spam... helpful)

We have two N3024 switches setup in an MLAG, both are uplinked to our core switches and a Xen server setup in LACP connected to each of the switches using a port-channel.

We are experiencing network issues with the VMs on Xen and the switches are showing lots of "MAC_MOVE" messages. 

Is seeing the MAC_MOVE messages indicative of a setup issue? I've attached a sample of the log below as well as our switch config, any help would be much appreciated!

Log sample:

Key:
aaaa.aaaa.aaaa = VM1
bbbb.bbbb.bbbb = VM2

Line 6: <189> Feb 21 09:31:14 Switch-1 FDB[dtlAddrTask]: fdb.c(584) 198364 %% NOTE MAC_MOVE: Mac aaaa.aaaa.aaaa in VLAN: 1 is overwritten from entryType 1 to 1and port Te1/0/1 to Po3
Line 11: <189> Feb 21 09:31:11 Switch -1 FDB[dtlAddrTask]: fdb.c(584) 198359 %% NOTE MAC_MOVE: Mac aaaa.aaaa.aaaa in VLAN: 1 is overwritten from entryType 1 to 1and port Po3 to Te1/0/1
Line 18: <189> Feb 21 09:31:05 Switch -1 FDB[dtlAddrTask]: fdb.c(584) 198352 %% NOTE MAC_MOVE: Mac bbbb.bbbb.bbbb in VLAN: 1 is overwritten from entryType 1 to 1and port Te1/0/1 to Po3
Line 22: <189> Feb 21 09:31:01 Switch -1 FDB[dtlAddrTask]: fdb.c(584) 198348 %% NOTE MAC_MOVE: Mac bbbb.bbbb.bbbb in VLAN: 1 is overwritten from entryType 1 to 1and port Po3 to Te1/0/1

Hi,

Are both Te1/0/1 and the po3 connected to the xen servers? Because the move messages are between them.

Hi Josh,

The Xen Servers are only connected on po3 across the two switches. Te1/0/1 is the uplink to the next set of switches in our network.

What could be causing the switches to think traffic is coming down Te1/0/1 when it always originates from po3?

Cheers
Andrew

You might want to try using wireshark to monitor the port and see if you can find out. Page 646 https://dell.to/2STTgGz

Thanks Josh, will try that out.

Is there any solution for this problem? I see same problem in my Dell networking. "MAC_MOVE" in the log message actually preventing the device unreachable or flapping intermittently. 

Po3 - Root port for VL20

Gi1/0/4 - Access VL20, where another DellOS10 switch connected using mgmt1/1/1 VRF management.

<190> Jul 21 15:47:22 msw1-1 FDB[dtlAddrTask]: fdb.c(690) 12431 %% INFO MAC_MOVE: Mac C4:5A:B1:51:E7:05 in VLAN: 20 is overwritten from entryType 1 to 1 and port Po3 to Gi1/0/4