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New Member

Default setting for Cisco 2950 Switch

Hello, I was wondering what the default administrative mode is on the switch interface ports?

Do they form trunks automatically when connected to other switches?


Re: Default setting for Cisco 2950 Switch

default on switch with no configuration for all ports is vlan 1 including any gigabit uplink ports if any, no other configuration is set for any type of trunking unless it is manualy configured for trunking or dynamic trunking.



New Member

Re: Default setting for Cisco 2950 Switch

Right O, thanks


Re: Default setting for Cisco 2950 Switch

The default mode on the 2950 is dynamic desirable so it will actively seek a trunk on a connected switch.

New Member

Re: Default setting for Cisco 2950 Switch

Is that correct? because that contradicts the other post.

Re: Default setting for Cisco 2950 Switch

In my experience for a switch that comes with no configuration I have always manualy make a switchport wether is a normal 10/100/1000 access port or gigabit port to participate in trunking either dynamic or non-dynamic, whether this has changed that ports defaults to dynamic on all ports I am not aware of it.

The simplest way to find out would be to have your switch connect to another switch to see if it auto negotiates DTP.




Re: Default setting for Cisco 2950 Switch

I know it conflicts, but I asked the switch and it told me so

#sh ver

Cisco Internetwork Operating System Software

IOS (tm) C2950 Software (C2950-I6K2L2Q4-M), Version 12.1(22)EA10a, RELEASE SOFTWARE (fc2)

cisco WS-C2950-12 (RC32300) processor (revision B0) with 19918K bytes of memory.

Running Standard Image

12 FastEthernet/IEEE 802.3 interface(s)

#sh run int f0/1

Building configuration...

Current configuration : 33 bytes


interface FastEthernet0/1


#sh int f0/1 switchport

Name: Fa0/1

Switchport: Enabled

Administrative Mode: dynamic desirable

Operational Mode: down

Administrative Trunking Encapsulation: dot1q

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Voice VLAN: none

Administrative private-vlan host-association: none

Administrative private-vlan mapping: none

Administrative private-vlan trunk native VLAN: none

Administrative private-vlan trunk encapsulation: dot1q

Administrative private-vlan trunk normal VLANs: none

Administrative private-vlan trunk private VLANs: none

Operational private-vlan: none

Trunking VLANs Enabled: ALL

Pruning VLANs Enabled: 2-1001

Capture Mode Disabled

Capture VLANs Allowed: ALL

Protected: false

Appliance trust: none

#sh interfaces f0/1 trunk

Port Mode Encapsulation Status Native vlan

Fa0/1 desirable 802.1q not-trunking 1


Re: Default setting for Cisco 2950 Switch

He is correct , default is dynamic desirable so if you plug into a cisco switch on the other end and the port is set as desirable or auto it will form a trunk .

Re: Default setting for Cisco 2950 Switch

I guess jcoke is the winner then, new info learned ! and deserves a good rating.

New Member

Re: Default setting for Cisco 2950 Switch

Thanks for your efforts guys, really appreciate it!

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