• Untagged frame: a frame that carries no VLAN tagging information in the frame
header.
• Tagged frame: a frame that contains the 32–bit 802.1q field (VLAN tag) and identifies
the frame as belonging to a specific VLAN.
• Untagged member: a port configured as an untagged member of a specific VLAN. When
an untagged frame exits the switch through an untagged member port, the frame header
remains unchanged. When a tagged frame exits the switch through an untagged member
port, the tag is stripped and the tagged frame is changed to an untagged frame.
• Tagged member: a port configured as a tagged member of a specific VLAN. When an
untagged frame exits the switch through a tagged member port, the frame header
changes to include the 32–bit tag associated with the ingress port PVID. When a tagged
frame exits the switch through a tagged member port, the frame header remains
unchanged. The original VLAN ID (VID) remains.
An example using the show vlan interface info command is provided in Example
Checking PVID of ports on page 58
.
To ensure that the uplink port(s) are tagged and a member of ALL of the configured VLANs,
use the show vlan interface vids command. An example using the show vlan
interface vids command is provided in
Example VLAN Interface VLAN IDs on
page
58.
Correct errors by adding missing VLANs to affected uplink ports. Refer to
Tagging options on
page
60.
Emergency recovery trees
32 Troubleshooting 5.1 February 2013
Comments? infodev@avaya.com
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