Re: Layer2 troubleshooting

This is just a wild guess but if your trunking 2 switches, don't both sides need to be trunks?

On May 14, 2010, at 6:39 PM, Jeferson Guardia wrote:

> GS,
>
> I am experiencing something weird on a switching scenario. Basically 2
> layer2 switches
> connected through a patch panel.
>
> I started getting the following message and errors started to increment
>
> *Sep 14 08:54:05.896 BR-EST: %SW_MATM-4-MACFLAP_NOTIF: Host 0022.196b.cd00
> in vlan 2006 is flapping between port Fa0/8 and port Gi0/1
>
> In order to troubleshoot it, I put one side on shutdown while I would check
> the configs and look
> for problems. But while one side is administratively shutdown, on the other
> side I still see it
> up/up. weird?! The physical connection has been checked.
>
> My configs on both sides:
>
> SW A
>
> interface ethernet 1/52
> description UPLINK AAE01 - P.8
> shutdown
> switchport allowed vlan add 1 untagged
> switchport ingress-filtering
> switchport native vlan 1
> switchport allowed vlan add 2006 tagged
>
> SW B
>
> Current configuration : 126 bytes
> !
> interface FastEthernet0/8
> description PRORESERVE - DKA 7o.
> switchport trunk allowed vlan 2006
> switchport mode trunk
> end
>
>
> Any thoughts?
>
>
> Rgs,
>
>
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Received on Fri May 14 2010 - 20:34:16 ART