04-10-2008 08:01 AM - edited 03-05-2019 10:19 PM
Hello.
I'm looking for information about if the 3750 Platform supports sub-interfaces.
Something like:
GigabitEthernet0/1.2
Thanks.
04-10-2008 08:21 AM
Dywer
I do not believe that the 3750 supports subinterfaces. Subinterfaces like that are frequently associated with trunk interfaces. But the 3750 configures trunking on physical interfaces not subinterfaces. What are you wanting to do with subinterfaces on the 3750? If we knew what you are trying to accomplish then perhaps we could suggest alternatives that would work.
HTH
Rick
04-10-2008 08:29 AM
I have an old 4908 switch. Each physical interface has 3 sub-interfaces like:
interface GigabitEthernet2.10
description data 10
encapsulation dot1Q 10
no ip directed-broadcast
bridge-group 10
!
interface GigabitEthernet2.11
description voice 11
encapsulation dot1Q 11
no ip directed-broadcast
bridge-group 11
!
interface GigabitEthernet2.99
description management
encapsulation dot1Q 99
no ip directed-broadcast
bridge-group 99
!
And there is a BVI to route the information.
I'm trying to do the same with 3750 switch.
04-10-2008 08:35 AM
Dywer
I do not believe that you can do literally the same thing on the 3750. I believe that you can achieve the same result but the way to do it is different. On the 3750 configure an interface as a trunk, configure VLANs 10, 11, and 99, and make sure that these VLANs are included on the trunk.
HTH
Rick
04-10-2008 01:33 PM
The equivalent configuration for 3750s would be something like:
vlan 10
description Data 10
vlan 11
description Voice 11
vlan 99
description Management
interface Vlan 10
description Data 10
interface Vlan 11
description Voice 11
interface Vlan 99
description Management
interface GigabitEthernet2/0/1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 10,11,99
switchport mode trunk
04-11-2008 08:44 AM
Thanks for your help.
Another question.
How do I configure diffent interfaces in the same bridge-group ? and How do can be controlled the traffic among the Vlans when and SVIs interfaces ?
04-11-2008 08:53 AM
First, you create a Layer2 Vlan:
switch(config)#vlan 2 name test
Second, you assign ports to this Vlan:
switch(config)#interface fx/x
switch(config-if)#switchport mode access
switch(config-if)#switchport access vlan 2
Optional, you enable routing for that Vlan
switch(config)#interface Vlan 2
switch(config)#ip add x.x.x.x y.y.y.y
I highly recommend reading this document:
HTH,
__
Edison.
04-14-2008 10:27 AM
Thanks for help.
I'm asking all those question because I would like to have the Inside, DMZ and Campus Network in the same switch stack.
How can I isolate the DMZ from the others subnets?
Thanks.
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