Reference Guide

VLAN | 1017
Figure 58-3. Tagged and Untagged Ports
Ports on either side of the link must have the same tagged/untagged designation, and if tagged, must
belong to the same VLAN. Else, the frame is dropped.
Figure 58-4. Switch Behavior for Tagged/Untagged Port Mismatch
Default VLAN
The Default VLAN and is part of the system startup configuration, and is by default VLAN 1. You may
make another VLAN the default VLAN. The default VLAN cannot be deleted, disabled, or configured
(you cannot assign it an IP address), and only untagged interfaces can belong to it.
When an interface is configured as a switchport automatically places it in the default VLAN as an
untagged interfaces. All switchports must belong to at least one VLAN, so to remove a switchport from the
default VLAN, you must place it as tagged or untagged in some other VLAN, or remove the
switchport
configuration.
Implementation Information
• FTOS supports up to 4093 port-based VLANs plus 1 Default VLAN.
• E-Series ExaScale FTOS versions earlier than 8.2.1.0 for the E-Series ExaScale support 2094 VLANs.
tagged VLAN 100
tagged VLAN 200
untagged VLAN 100
tagged
untagged
tagged
untagged
(no config)
untagged
ports on either side of the link
are untagged so traffic is forwarded
but on the default VLAN
tagged
untagged
X
tagged
(no config)
X
ports on either side of the link
are untagged so traffic is forwarded
but on the default VLAN