I would like to trunk a VLAN from our core switch (Cisco Catalyst 6509) to an access switch (Cisco Catalyst 3548)... We do NOT use VTP on our network.

I have enabled IEEE 802.1Q encapsulation trunk mode on the core switch (Cisco Catalyst 6509) port with the following command:

set trunk 5/5 on dot1q

I have enabled IEEE 802.1Q encapsulation, trunk mode, and allowed trunking of all VLANs on the access switch (Cisco Catalyst 3548) port with the following commands:

switchport trunk encapsulation dot1q switchport mode trunk switchport trunk allowed vlan all switchport access vlan 200

Am I required to add anything to the local VLAN database on the access switch? Can someone explain what the VLAN database command is used for on access switches? I notice I can add / remove VLANs from within this command. But is it necessary when we are not using VTP? Is the "switchport access vlan" command on the port enough?



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You must have VLANs with the same VLAN ID configured on the both ends of the trunk to pass them through the trunk. It means you have to have VTP configured on a both sides. However you may have your VTP domain "transparent" - i.e. all VLANs are "local" and not propogated anywhere outside the local switch.


Michael Shavrov

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If you are setting up your vlans in the 6500 and no where else, then set the vtp mode to client and not server. The Catalyst 3548's have the vtp mode set to server by default. Setting it to client mode will help avoid vlan propagation problems in the future.

The Catalyst 6509 using CatOS command to set the vlan:

set vlan 200 name VLAN0200 type ethernet mtu 1500 said 100200 state active

On the Catalyst 3548 for trunking the Gig 0/1 port for example:

interface GigabitEthernet0/1 switchport trunk encapsulation dot1q switchport mode trunk

On the Fast Ethernet ports for example:

interface FastEthernet0/1 switchport access vlan 200 spanning-tree portfast

A show vlan command on the 3548 should show:

200 VLAN0200 active Fa0/1 (This will show that port Fast Ethernet 0/1 is assigned vlan 200 access)

A show vtp status command should show:

VTP Version : 2 Configuration Revision : 219 Maximum VLANs supported locally : 254 Number of existing VLANs : 61 (Number of Vlans configured will show here) VTP Operating Mode : Client (VTP mode will show here, Client, Server, Transparent, etc.) VTP Domain Name : GISD (your VTP domain name will show here) VTP Pruning Mode : Disabled VTP V2 Mode : Enabled VTP Traps Generation : Enabled MD5 digest : 0x85 0xB0 0xC3 0x5A 0x29 0x76 0xF2 0x7C Configuration last modified by at 9-24-05 15:51:00 (Your

6509 ip address should show here with the date of the last vlan configuration)

I hope this helps......


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