Loops detected in the network for mac?

[touqeeranjum]

Hi,

I ran into an IP conflict issue and shutdown 1 of the system so I changed the IP addresses but a few days ago I powered back on both the systems and was facing intermittent connectivity issue in one of the systems, the ping was replying then stopping then replying again.

I checked the switch and it was showing the below

Loops detected in the network for mac f8f2.1e8a.8fb0 among ports Eth1/2 and Eth1/23 vlan 50 - Disabling dynamic learning notifications for a period between 120 and 240 seconds on vlan

I reset both both system and set the original IP addresses again (different IP addresses) but now both systems are not reachable. When I check the switch for LLDP neighbours the MAC address is correct, but both systems do not appear in the MAC address table either.

I performed clear ip arp 10.1.1.233 and clear ip arp 10.1.1.234, rebooted the systems, shutdown ports, and pinged from the systems to the switch’s SVI all of which are in the same VLAN, but there is no ping response.

Can anyone suggest what else can be done ?

[Mark Elsen]

  - @touqeeranjum               On what platform  are you seeing this message ?

  M.

[touqeeranjum]

Hi @Mark Elsen 

This is a Cisco Nexus 3172, NXOS: version 9.2(2)

[balaji.bandi]

Is this vPC then  making sure the VLAN is allowed between these vPC switches?

[touqeeranjum]

Sorry not sure what you mean by vPC, these are physical servers, 2 running ESXi and 2 are Storage servers, the issue seems to come from an ESXi server initially, but now its showing on the Storage server which was previously used as a temporary ESXi server..

[balaji.bandi]

how is your network connected  to nexus ?

[touqeeranjum]

Each server has 4 interfaces, only the 1st interface on all servers have been assigned an IP address..

On the ESXi, 2 are for management which also carry vMotion traffic, 2 are for storage..

On the Storage also 2 are for management, 2 for storage..

On the switch side, the 1st 2 ports are on VLAN50 for all the 4 servers, but only the 2 storage servers are not reachable.

[balaji.bandi · Accepted solution]

How does the switch side configuration look like? Is this only one Nexus switch?

 Eth1/2 and Eth1/23 vlan 50

what is this ports conneced ? what is that MAC address associated with IP ?

[touqeeranjum · Accepted solution]

Thanks everyone..

I just performed a no switchport and reconfigured the port, and its working now..