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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Flooded packets on all VLANs are received on a server

Symptom: All packets flooded on all VLANs on an Aggregator are received on a server, even if the server is configured as a member of only a subset of VLANs. This behavior happens because all Aggregator ports are, by default, members of all (4094) VLANs.

Resolution: Configure a port that is connected to the server with restricted VLAN membership.

Steps to Take:

  1. Display the current port mode for Aggregator L2 interfaces (show interfaces switchport interface command)..
    Dell#show interfaces switchport tengigabitethernet 0/1
                                        
                                        Codes:  U - Untagged, T - Tagged
                                        x - Dot1x untagged, X - Dot1x tagged
                                        G - GVRP tagged, M - Trunk, H - VSN tagged
                                        i - Internal untagged, I - Internal tagged, v - VLT untagged, V - VLT tagged
                                        
                                        Name: TenGigabitEthernet 0/1
                                        802.1QTagged: Hybrid
                                        
                                        SMUX port mode: Auto VLANs enabled
                                        Vlan membership:
                                        Q       Vlans
                                        U       1
                                        T       2-4094
                                        
                                        Native VlanId:    1
                                     
  2. Assign the port to a specified group of VLANs (vlan tagged command) and re-display the port mode status..
    Dell(conf)#interface tengigabitethernet 0/1
                                        Dell(conf-if-te-0/1)#vlan tagged 2-5,100,4010
                                        Dell(conf-if-te-0/1)#
                                        
                                        Dell#show interfaces switchport tengigabitethernet 0/1
                                        
                                        Codes:  U - Untagged, T - Tagged
                                        x - Dot1x untagged, X - Dot1x tagged
                                        G - GVRP tagged, M - Trunk, H - VSN tagged
                                        i - Internal untagged, I - Internal tagged, v - VLT untagged, V - VLT tagged
                                        
                                        Name: TenGigabitEthernet 0/1
                                        802.1QTagged: Hybrid
                                        SMUX port mode: Admin VLANs enabled
                                        Vlan membership:
                                        Q       Vlans
                                        U       1
                                        T       2-5,100,4010
                                        
                                        Native VlanId:    1  
                                     

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