How-To : Create VLAN Trunk between Cisco 3500 IOS and Foundry BigIron
Description :

Unfortunately Cisco and Foundry disagree on the definition of a "trunk". I recently had to find a way to trunk multiple vlans between a Cisco 3500 IOS and a Foundry BigIron switch. I made a quick call to a Foundry Systems Engineer to find out what was needed to make this happen.

References :

Cisco 802.1Q Trunking

Foundry VLAN Tagging


Outline :

Procedure :
  • Cisco IOS Configuration
    • Go to Enable mode
      • cswitch> enable
    • Go to Config mode
      • cswitch> config terminal
    • Change to Trunk Interface (i.e. Gigabit Port 0/2)
      • cswitch> interface GigabitEthernet0/2
    • Create Trunk
      • cswitch> switchport trunk encapsulation dot1q
      • cswitch> switchport mode trunk
    • Add ports to VLAN 10
      • cswitch> interface FastEthernet0/1
      • cswitch> switchport access vlan 10
    • Save configuration
      • cswitch> end
      • cswitch> write mem
  • Foundry BigIron Configuration
    • Go to Enable mode
      • fswitch> enable
    • Go to Config Mode
      • fswitch> config terminal
    • Go to first VLAN you want to configure
      • fswitch> vlan 10
    • Add the trunk port (i.e. 1/1) to this VLAN
      • fswitch> tagged ethe 1/1
    • Add "host" ports to this VLAN (NOT ports that are being trunked)
      • fswitch> untagged ethe 4/1 to 4/20
    • Now go to the next VLAN
      • fswitch> vlan 20
    • Continue to add the "trunk" port as a "tagged" interface to each VLAN. Add "host" ports as "untagged" interfaces to each VLAN.
    • Save Configuration
      • fswitch> write mem

 
Last Modified :

10-25-2004: Initial Creation
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