How to trunk multiple vlans off of one port (revisited) help!!

[pctechnician]

rcasta's last post was when you set trunking on the 2950 switch to type:

inter fastethernet 0/8
switchport trunk encapsulation dot1q
switchport mode trunk

well i tried it but there was nothing on encapsulation. Here's what i did: (--means sub categories)

int fa 0/8
switchport trunk
--allowed
--vlan
--add,all,except,remove
--native
--vlan
--add,all,except,remove

no sub category on encapsulation. Is it something im doing wrong. Or do i just config it like this :

switchport mode trunk
switchport trunk allowed vlan <vlan number>

or

switchport mode trunk
switchport trunk allowed vlan <vlan number>

if anybody is wondering what im trying to do see my first post.

thanks

A+,Network+,MCP

 

[pctechnician]

also i set vlan's 10 and 11 on the 2950 switch. are those vlans getting ip addresses or not?

A+,Network+,MCP

 

[bantrab]

this is the way I have my interfaces configure for vlan trunking

interface GigabitEthernet1/1
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,103
switchport mode trunk

this configuration has to be in both ends of the connection
for example if I connect this to a switch via the Gi0/48 this interface also has to be like

interface GigabitEthernet0/48
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,103
switchport mode trunk

IMPORTANT: you have to allow trunk in both sides not just one.

 

[pctechnician]

On the 2950 switch that i have there is no option for encapsulation dot1q on it. The only options you have when you go into switchport trunk is allowed and native. that is how i set it.

i.e

interface fastethernet 0/8
switchport mode trunk
switchport trunk allowed vlan add 1,40-42

like i said theres no encapsulation options in switchport trunk mode on my switch. Im running 2950 (could be the ver needs updating)

If theres a way that i have yet to try to get encapsulation let me know please.

A+,Network+,MCP

 

[Piass]

I would guess that either the switch only supports dot1q, therefore there's no option, or your software version is old or has a bug in it.

You could try checking the command reference on CCO for your version of s/w.

 

[rcasta]

pctechnician,

Like Piass said, this 2900 surely supports intrinsically dot1q. Since other catalysts for backward compatibility with switches supporting ISL and switches supporting dot1q, the command I gave you awhile ago will do for some models and won't do for others.

Be sure your router does support dot1q (only works on 10/1000 ethernet ports)

cheers,
CCNA