show vlan brief versus show vlan id 1

[Phil Williamson]

Why is VLAN1 not shown for Fast 0/24 in "show vlan brief", but it is for "show vlan id 1"? What am I missing about the two commands?

Cat29500#show vlan brief

VLAN Name Status Ports

---- -------------------------------- --------- -------------------------------

1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4

Fa0/5, Fa0/6, Fa0/7, Fa0/8

Fa0/9, Fa0/10, Fa0/11, Fa0/12

Fa0/13, Fa0/14, Fa0/15, Fa0/16

Fa0/17, Fa0/18, Fa0/19, Fa0/20

Fa0/21, Fa0/22, Fa0/23

1002 fddi-default act/unsup

1003 token-ring-default act/unsup

1004 fddinet-default act/unsup

1005 trnet-default act/unsup

Cat29500#

Cat29500#show vlan id 1

VLAN Name Status Ports

---- -------------------------------- --------- -------------------------------

1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4

Fa0/5, Fa0/6, Fa0/7, Fa0/8

Fa0/9, Fa0/10, Fa0/11, Fa0/12

Fa0/13, Fa0/14, Fa0/15, Fa0/16

Fa0/17, Fa0/18, Fa0/19, Fa0/20

Fa0/21, Fa0/22, Fa0/23, Fa0/24

VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2

---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------

1 enet 100001 1500 - - - - - 0 0

Remote SPAN VLAN

----------------

Disabled

Primary Secondary Type Ports

------- --------- ----------------- ------------------------------------------

Cat29500#

[aravindhs]

Hi

Is the port fa0/24 a trunk with native VLAN of 1?

Can you post the outputs of ;

show interfaces fa0/24 switchport

show interfaces fa0/24 trunk

cheers

Arav

[Phil Williamson]

Arav,

Cat2950#show interfaces fa0/24 switchport

Name: Fa0/24

Switchport: Enabled

Administrative Mode: dynamic desirable

Operational Mode: trunk

Administrative Trunking Encapsulation: dot1q

Operational Trunking Encapsulation: dot1q

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Voice VLAN: none

Administrative private-vlan host-association: none

Administrative private-vlan mapping: none

Administrative private-vlan trunk native VLAN: none

Administrative private-vlan trunk encapsulation: dot1q

Administrative private-vlan trunk normal VLANs: none

Administrative private-vlan trunk private VLANs: none

Operational private-vlan: none

Trunking VLANs Enabled: ALL

Pruning VLANs Enabled: 2-1001

Capture Mode Disabled

Capture VLANs Allowed: ALL

Protected: false

Appliance trust: none

Cat2950#

Cat2950#show interfaces fa0/24 trunk

Port Mode Encapsulation Status Native vlan

Fa0/24 desirable 802.1q trunking 1

Port Vlans allowed on trunk

Fa0/24 1-4094

Port Vlans allowed and active in management domain

Fa0/24 1

Port Vlans in spanning tree forwarding state and not pruned

Fa0/24 1

Cat2950#

thx

Phil

[glen.grant]

Thats why the link is a trunk , I believe the show vlan brief tells you what vlan the access ports (non trunked) ports are assigned to .

[Phil Williamson]

Glen,

That's the answer I'm looking for. It appears the 'brief' command simply does not include trunk links, but I could not find that in Cisco's documentation. Just wanted to be sure I was not missing anything.

Thx

Phil

[aravindhs]

If you think i answered ur question, why not rate it :)

cheers