Displaying VLAN Information

After you configure the VLANs, you can verify the configuration using the various show commands.

The following example shows how VLANs are displayed in alphanumeric order.

device# show run
...
vlan 2 by port
...
vlan 10 by port
...
vlan 100 by port
...

The following example shows how to display system-wide VLAN information.

Use the show vlan command to display VLAN information for all the VLANs configured on the device.

device# show vlan 10
Total PORT-VLAN entries: 6
Maximum PORT-VLAN entries: 1024

PORT-VLAN 10, Name [None], Priority level0, On
 Untagged Ports: None
   Tagged Ports: (U1/M1)  48 
   Tagged Ports: (U3/M1)  48 
 Mac-Vlan Ports: None
     Monitoring: Disabled

The following example shows how to display global VLAN information.

device#  show vlan brief 
System-max vlan Params: Max(4095) Default(1024) Current(3210)
Default vlan Id :1
Total Number of Vlan Configured :5
VLANs Configured :1 to 4 10

The following example shows how to display VLAN information for specific ports.

device# show vlan ethernet 1/7/1
Total PORT-VLAN entries: 3
Maximum PORT-VLAN entries: 8
legend: [S=Slot]
PORT-VLAN 100, Name [None], Priority level0, Spanning tree Off
 Untagged Ports: (S7)  1  2  3  4
   Tagged Ports: None

The following example shows how to display a port VLAN membership for a specific port on the device.

device# show vlan brief ethernet 1/1/5

Port 1/1/5 is a member of 3 VLANs
VLANs 5 101 4094
Untagged VLAN  : 1
Tagged   VLANs : 5 101 4094
Note: The untagged VLAN will show the system default VLAN ID even if the port is not part of it.

The following example shows a port's implicit dual-mode VLAN membership where the port is untagged in any of the VLAN.

ethernet 7 -

TECHNICAL QUESTION - Please confirm with Sys Eng that this syntax is correct.

Our Command Ref Guide reflects the use of the full x/y/z parameter structure (not a single character)

device# show interfaces ethernet 7
GigabitEthernet7 is down, line protocol is down
Port down for 2 days 1 hour 40 minutes 5 seconds
  Hardware is GigabitEthernet, address is 0000.00a8.4706 (bia 0000.00a8.4706)
  Configured speed auto, actual unknown, configured duplex fdx, actual unknown
  Configured mdi mode AUTO, actual unknown
  Untagged member of L2 VLAN 3999, port state is BLOCKING
Note: The port up/down time is required only for physical ports and not for loopback, virtual ethernet (ve), and tunnel ports.

The following example shows a port's implicit dual-mode VLAN membership where the port is tagged (explicitly removed from default VLAN).

device# show interfaces ethernet 1/7/1
GigabitEthernet1/7/1 is down, line protocol is down
Port down for 2 days 1 hour 40 minutes 5 seconds
  Hardware is GigabitEthernet, address is 0000.00a8.4706 (bia 0000.00a8.4706)
  Configured speed auto, actual unknown, configured duplex fdx, actual unknown
  Configured mdi mode AUTO, actual unknown
  Tagged member of 1 L2 VLANs, port state is BLOCKING

The following example shows ay a port's implicit dual-mode VLAN membership where the port is tagged in some of the VLANs and untagged in any VLAN (implicit dual-mode).

device# show interfaces ethernet 1/7/1
GigabitEthernet1/7/1 is down, line protocol is down
Port down for 2 days 1 hour 40 minutes 5 seconds
  Hardware is GigabitEthernet, address is 0000.00a8.4706 (bia 0000.00a8.4706)
  Configured speed auto, actual unknown, configured duplex fdx, actual unknown
  Configured mdi mode AUTO, actual unknown
  Tagged member of 2 L2 VLANs, untagged in VLAN 3999, port state is BLOCKING

The following example shows how to display port default VLAN IDs (PVIDs).

device# show interfaces brief 
Port  Link    State   Dupl Speed Trunk Tag Pvid Pri MAC            Name
1     Up      Forward Full 1G    None  No  1    0   0000.00a8.4700 a12345678901
2     Up      Forward Full 1G    None  Yes 1    0   0000.00a8.4701
3     Up      Forward Full 1G    None  Yes NA   0   0000.00a8.4702
4     Up      Forward Full 1G    None  Yes NA   0   0000.00a8.4703
5     Up      Forward Full 1G    None  No  2    0   0000.00a8.4704
6     Down    None    None None  None  Yes NA   0   0000.00a8.4705
7     Down    None    None None  None  Yes 4    0   0000.00a8.4706
8     Down    None    None None  None  Yes 4    0   0000.00a8.4707
9     Down    None    None None  None  Yes NA   0   0000.00a8.4708
10    Down    None    None None  None  Yes NA   0   0000.00a8.4709

The output of the show interfaces brief command lists the port default VLAN IDs (PVIDs) for each port. PVIDs are displayed as follows:

  • For untagged ports, the PVID is the VLAN ID number.
  • For an interface configured as untagged member in any VLAN, the PVID will be that VLAN ID. If the interface is explicitly removed from default VLAN (that is, configured as purely tagged), then PVID is not applicable.

The following example shows a PVLAN configuration, including the primary VLAN and its associated secondary VLANs as well as their member ports, promiscuous ports, and ISL ports.

device# show pvlan
PVLAN: primary VLAN  100 
 Port 1/1/4 1/1/10 1/1/11
Community VLAN  102 
 Port 1/1/1 1/1/2 1/1/10 1/1/11
 Promiscuous Port: 1/1/4
 Inter switch link Port: 1/1/10 1/1/11
 BpduGuard enabled Port: 1/1/1 1/1/2  
Isolate   VLAN  101 
 Port 1/1/3 1/1/10 1/1/11
 Promiscuous Port: 1/1/4
 Inter switch link Port: 1/1/10 1/1/11
 BpduGuard enabled Port: 1/1/1 1/1/2
Note: The show pvlan command is not supported on platforms using the software forwarding feature.
Parent topic: VLANs