BROCADE IP PRIMER

Configuring VLANsVLAN, and add it back in as a tagged member. As you might have guessed, thiswill temporarily interrupt service between the two switches. Remember that fortagging to work, both sides of the link must be tagged. If one side is taggedand the other side is untagged, no frames will pass successfully.Do you see why I called this bad planning? It would have been better to makethe two-port trunk (ports 1 and 2) tagged members of VLAN 20 to begin with.Oh, sure, they would be only members of one VLAN, but they have the potentialneed to be members of many VLANs. Generally speaking, it's almost always agood idea to tag a switch-to-switch link. Even if you're only tagging it to oneVLAN, it will save you a great deal of headache when changes are made later.Okay, let's change the two-port trunk on both switches to be tagged:4thFloorSwitch#conf t4thFloorSwitch(config)#vlan 204thFloorSwitch(config-vlan-20)#no untagged e 1 to 24thFloorSwitch(config-vlan-20)#tagged e 1 to 2added tagged port ethe 1 to 2 to port-vlan 204thFloorSwitch(config-vlan-20)#The fourth and fifth floor switches are no longer communicating to each otherright now. The fourth floor trunk ports are tagged, and the fifth floor trunkports are still untagged. To fix this, we perform the same procedure on the fifthfloor switch:5thFloorSwitch#conf t5thFloorSwitch(config)#vlan 205thFloorSwitch(config-vlan-20)#no untagged e 1 to 25thFloorSwitch(config-vlan-20)#tagged e 1 to 2added tagged port ethe 1 to 2 to port-vlan 205thFloorSwitch(config-vlan-20)#The executives have gotten angry with you because you caused an outage, butyou've made your change now. The switches are communicating again. Thetrunk is now a tagged member of VLAN 20. Are we done? Well, the CFO's workstationstill can't talk to the Accounting department. The two-port trunk is atagged member of VLAN 20, but it's still not a member of VLAN 10. Let's fixthat now:4thFloorSwitch#conf t4thFloorSwitch(config)#vlan 104thFloorSwitch(config-vlan-10)#tagged e 1 to 2added tagged port ethe 1 to 2 to port-vlan 104thFloorSwitch(config-vlan-10)#And on the same procedure on the fifth floor switch:5thFloorSwitch#conf t5thFloorSwitch(config)#vlan 105thFloorSwitch(config-vlan-10)#tagged e 1 to 2added tagged port ethe 1 to 2 to port-vlan 105thFloorSwitch(config-vlan-10)#Brocade IP Primer 177