Checking out a problem in the lab using Virtual Connect Flex-10

[chuckk281]

Yan was looking for some help when looking at a VC Flex-10 issue.

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Our customer application environment was  BL460CG6+VCFlex10+Vsphere4.1(topology as attached),but there were some problems during the implement.

1. They use 2 VC flex-10 in C7000 with firmware 2.33 ,and  smartlink and vlan tunneling was assigned. NIC driver version was bnx2x1.52 on Vsphere4.1;  2 VC module  uplink to Cisco catalyst 3750G and Catalyst 4948 as the attachment.

 Current  issue is warning on switch, detail warning information as below:

May 27 14:28:55: %SW_MATM-4-MACFLAP_NOTIF: Host 0050.567e.cd76 in vlan 10 is flapping between port Po1 and port Po3

May 27 14:28:55: %SW_MATM-4-MACFLAP_NOTIF: Host 0050.5671.d3a0 in vlan 10 is flapping between port Po1 and port Po3

May 27 14:28:55: %C4K_EBM-4-HOSTFLAPPING: Host 00:50:56:7E:CD:76 in vlan 10 is flapping between port Po3 and port Po1

May 27 14:28:55: %C4K_EBM-4-HOSTFLAPPING: Host 00:50:56:71:D3:A0 in vlan 10 is flapping between port Po3 and port Po1

1. Another issue: every physical NIC on 460G6 was split to 3 logical NIC, after perform smart link，the Vmware NIC  can’t detect  the uplink  interrupt .so the using  NIC  model was Beacon Probing ，but  the customer felt net  speed  slowly . It seemed DCC unavailable. 

Your kind feedback is appreciated.

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Carlos jumped in:

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Yan,

In regards to your error:

May 27 14:28:55: %SW_MATM-4-MACFLAP_NOTIF: Host 0050.567e.cd76 in vlan 10 is flapping between port Po1 and port Po3

May 27 14:28:55: %SW_MATM-4-MACFLAP_NOTIF: Host 0050.5671.d3a0 in vlan 10 is flapping between port Po1 and port Po3

May 27 14:28:55: %C4K_EBM-4-HOSTFLAPPING: Host 00:50:56:7E:CD:76 in vlan 10 is flapping between port Po3 and port Po1

May 27 14:28:55: %C4K_EBM-4-HOSTFLAPPING: Host 00:50:56:71:D3:A0 in vlan 10 is flapping between port Po3 and port Po1

This is due to a teaming fail over. When the team fails to the secondary NIC the team MAC is learned on the second switch.Channel-group-3 and Channel-group-1. That is the reason for the flapping. Check the team status to see as to the reason why they are failing over.

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Any other comments or suggestions? Let us know if you have seen this problem and how you resolved it.