2950 and 3550 Series

2950 and 3550 Series
The 2950 switches support the same options but with different commands, as in the next example.
The 2950 series supports only IEEE 802.1Q VLANs, whereas the 3550 support ISL as well:
Terry_2950(config-if)#switchport trunk ?
allowed Set allowed VLAN characteristics when interface is in trunking mode
native Set trunking native characteristics when interface is in trunking
mode
pruning Set pruning VLAN characteristics when interface is in trunking mode
Trunking 463
Terry_2950(config-if)#switchport mode ?
access Set trunking mode to ACCESS unconditionally
dynamic Set trunking mode to dynamically negotiate access or trunk mode
trunk Set trunking mode to TRUNK unconditionally
Terry_2950(config-if)#switchport mode dynamic ?
auto Set trunking mode dynamic negotiation parameter to AUTO
desirable Set trunking mode dynamic negotiation parameter to DESIRABLE
Terry_2950(config-if)#switchport mode dynamic auto
Terry_2950(config-if)#^Z
Terry_2950#