Cisco 3550 VLAN Trunk

[joopdog]

We have an old outdated phone or voice VoIP (NBX 100) system on our network. And we are using a Cisco 3550 switch. So far everything works.

However, our network is slow because of the old VoIP phone system, due to broadcasting (design flaw), I'd like to put the phone traffic on a different network or subnet.

I currently have two separate VLans, my main network VLAN1 (192.168.1.0/24) and a VLAN10 (10.10.100.0/24) not being used. The data traffic would stay on VLAN1 and I’d put the voice traffic in the VLAN10.

The problem is the cabling. We've got one Fibre Optic backbone going to each building. Data and Voice must traffic travel through the one fibre link. I want to trunk or tunnel VLAN10 thru VLAN1, is this possible?

If it is possible, what is the 3550 Cisco configuration for this?

Equipment List:
(1) Cisco 3550 switch (12.2(25)SEB4)
(2) Cisco 2514 Routers (IOS (tm) 2500 Software (C2500-I-L), Version 12.1(5))
(1) Dell 2608 Gigabit Switch
(1) Dell 2616 Gigabit Switch
(4) Netgear 10/100 FS524 switches
(1) Netgear 10-BaseT EN516 hub
(1) Linksys EF3124 switch
(2) Watchguard Fireboxes

What the 3550 Cisco IOS configuration on this?

I appreciate any help on this.

 

[vipergg]

Yes it is , just create a trunk on each side . If the other side is not cisco then i can't help you with that if its Dell or Netgear on the other end , you would have to look at their docs to see if trunking is possible .

interface fx/x
switchport
switch trunk encapsulation dot1q
switchport trunk native vlan 1
switchport trunk allowed vlan 1,10
switchport mode trunk

 

[joopdog]

Thanks viprergg,

I tested it on a Cisco 2950 Switch that’s not in production. And it WORKED!!!

I typed in the following commands:
cisco2950(config-vlan)# vlan 10
cisco2950(config-vlan)# name VLAN0010

cisco2950(config)# int vlan 10
cisco2950(config-if)#ip address 10. 0.1.10 255.255.255.0
cisco2950(config-if)# no shut

cisco2950(config-if-range)# int range f0/17 - 18
cisco2950(config-if-range)# switchport mode access
cisco2950(config-if-range)# switchport access vlan 10
cisco2950(config-if-range)# ctrl-z
cisco2950#
cisco2950#config t
cisco2950(config)# int range f0/17 - 18
cisco2950(config-if-range)# switchport mode trunk
cisco2950(config-if-range)# switchport trunk native vlan 1
cisco2950(config-if-range)# switchport trunk allowed vlan all
cisco2950(config-if-range)# ctrl-z
cisco2950#

I created VLAN10 (10.0.1.10) using ports 17 and 18. I connected devices (10.0.1.0/24) to port 17 to the 2950 switch.

Then I created VLAN1 (192.168.3.100) connected to a 1600 Router (192.168.3.10). I then connected a test laptop (10.0.1.20) into VLAN1 using port 5.

I was able to ping devices in VLAN10 thru the laptop. It WORKED!!!

I can’t believe it was that easy. I love Cisco.

Just for kicks I decided to remove the TRUNK commands. I was not able to ping. Which was great, I know that commands are correct. I re-introduced the commands, and it worked.

I ran some SHOW COMMANDS:

cisco2950#sh int trunk

cisco2950#vlan database
cisco2950(vlan)# sh current
cisco2950(vlan)# exit

cisco2950#sh int f0/17 switchport

Sure enough, it does show that port 17 and 18 were encapsulated. Thanks again viprergg.

Thanks for all your help,

 

[vipergg]

Technically they don't recomend you use vlan 1 for data as it is the default vlan which carries stuff like cdp and vtp and other functions. If you ever have the chance i would put 192.168.1.X into say vlan 3 and distribute it out . If its a small network then I wouldn't worry too much about it .