Tuesday, April 15, 2014

Brocade Switch: "Invalid input -> untagged ethernet X/X/X" : Default Vlan Thoughts

Man this really gets me.  I dont like having to do this, but I guess there is some logic behind this somewhere.  Everyone knows I like the Brocade switches, so dont hate me for pointing this one thing out.  I dont like how you have to change the default vlan ID from VLAN 1 to something else (unless you are not going to use VLAN1).  You dont have to do that in Cisco.  And because you have to change this in Brocade, you get the following kind of config notice when you are trying to configure a port for the default vlan:
ICX6610-48P Router(config)# vlan 1
ICX6610-48P Router(config-vlan-1)#untagg eth 1/1/1
Invalid input -> untagg eth 1/1/1
Type ? for a list
ICX6610-48P Router(config)#default-vlan-id 499
ICX6610-48P Router(config)#vlan 1
ICX6610-48P Router(config-vlan-1)#untagg eth 1/1/1
Added untagged port(s) ethe 1/1/1 to port-vlan 1.

So, one way to look at this is that the default vlan (in Brocade) is the parking lot for any port that does not belong to a usable VLAN.  So, if you have 10 VLANs and you are routing between them, you wont be using the default-vlan.  You will be using that only as a parking lot for any port that doesnt not fit into your 10 VLAN scenario.  So the default is VLAN 1.  Keep note of that and change it when you start configuring a switch.  Almost everyone uses VLAN 1.  I said 'almost'.

Some useful notes I found in the Brocade/Foundry documentation:
1.  When you enable port-based VLANs, all ports in the system are added to the default VLAN. By default, the default VLAN ID is “VLAN 1”. The default VLAN is not configurable. If you want to use the VLAN ID “VLAN 1” as a configurable VLAN, you can assign a different VLAN ID to the default VLAN.

2.  NOTE: Changing the default VLAN name does not change the properties of the default VLAN. Changing the name allows you to use the VLAN ID "1" as a configurable VLAN.

3.  You must specify a valid VLAN ID that is not already in use. For example, if you have already defined VLAN 10, do not try to use “10” as the new VLAN ID for the default VLAN. Valid VLAN IDs are numbers from 1 – 4095.


  1. Thanks,
    Had no idea about this and was getting "invalid input"
    Was going crazy until I saw your blog


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