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configuring an interface to vlan on switch

Posted on 2013-02-05
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Last Modified: 2013-02-06
Dear experts,

I was looking at Lab scenario and I notice that the solution given to configure an interface to vlan was below.

SwA(config)# interface f0/10
swA(config-if)#switchport access vlan 10

but as per cisco documentation i seen this additional command.

SwA(config-if)#switchport mode access
SwA(config-if)Switchport access vlan 10

My question is which is correct or are both correct?
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Question by:Zak
3 Comments
 
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by:bedind
bedind earned 167 total points
ID: 38858107
You will still need the first line, ie.
SwA(config)# interface f0/10

Then you *should* add the 2 lines:
SwA(config-if)#switchport mode access
SwA(config-if)Switchport access vlan 10

yes, without switchport mode access being defined it should still work, but not best practice
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by:Akinsd
Akinsd earned 166 total points
ID: 38858114
Both are the same


SwA(config)# interface f0/10
SwA(config-if)#switchport mode access
SwA(config-if)Switchport access vlan 10

the interface command gets you into the interface
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LVL 50

Accepted Solution

by:
Don Johnston earned 167 total points
ID: 38859217
By default, Cisco Catalyst switches have their ports in DTP dynamic mode (switchport mode dynamic desirable). This will allow a port to automatically become a trunk port when connected to another Cisco switch.

So if the port is connected to a PC, then it will be an access port since the PC doesn't do DTP.

But... It is possible to spoof DTP negotiation from a PC. Which would then make that port a trunk and allow someone to have access to all VLANs.

Which is why, as bedind stated, it's not best practice.
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