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IP Tunnel

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  • IP Tunnel

    IP Tunnel

    We have phone or voice traffic (NBX 100) on our network using a Cisco 3550 switch, it works great.

    However, itís slowing down our network because of broadcasting, IĎd like to put the phone traffic on a different network or subnet. Is it possible to tunnel the voice traffic through our network?

    Our main subnet is the Currently, our NBX phone system is also on the same network. Iíd like to pipe or tunnel the voice traffic using through the We donít want to bring new Ethernet cables to every office.

    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))
    (2) Watchguard Fireboxes

    What the Cisco IOS configuration on this?

    I appreciate any help on this.


  • #2
    Re: IP Tunnel - IT WORKS!!!

    The better question should have been:
    We have an old outdated phone or voice VoIP (NBX 100) system on our network.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 ( and a VLAN10 ( not being used. The data traffic would stay on VLAN1 and Iíd 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 tested it on a Cisco 2950 Switch thatís 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
    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#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

    I created VLAN10 ( using ports 17 and 18. I connected devices ( to port 17 to the 2950 switch.

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

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

    I canít 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 for all your help,