Private-vlan (PVLAN) not any option in FE but only vlan-interface only in Cisco 3550

[csawest.dc]

Dear Members,

There is no any private-vlan option in fastEthernet only but there is in vlan interface option  of private-vlan

CISCO-3550(config)#vl
CISCO-3550(config)#vlan 34
CISCO-3550(config-vlan)#pri
CISCO-3550(config-vlan)#private-vlan ?
  association       Configure association between private VLANs
  community         Configure the VLAN as a community private VLAN
  isolated          Configure the VLAN as an isolated private VLAN
  primary           Configure the VLAN as a primary private VLAN
  twoway-community  Configure the VLAN as a two way community private VLAN

CISCO-3550(config-vlan)#private-vlan

CISCO-3550(config)#int fastEthernet 0/24

CISCO-3550(config-if)#sw
CISCO-3550(config-if)#switchport pri
CISCO-3550(config-if)#switchport ?
  access         Set access mode characteristics of the interface
  block          Disable forwarding of unknown uni/multi cast addresses
  broadcast      Set broadcast suppression level on this interface
  host           Set port host
  mode           Set trunking mode of the interface
  multicast      Set multicast suppression level on this interface
  nonegotiate    Device will not engage in negotiation protocol on this
                 interface
  port-security  Security related command
  priority       Set appliance 802.1p priority
  protected      Configure an interface to be a protected port
  trunk          Set trunking characteristics of the interface
  unicast        Set unicast suppression level on this interface
  voice          Voice appliance attributes
  <cr>

Running IOS : flash:c3550-i9q3l2-mz.121-14.EA1a/c3550-i9q3l2-mz.121-14.EA1a.bin

Here is not any private-vlan option in Fast Ethernet  to define primary vlan with secondery vlan on interface.

Thanks in ADV,

[Souvik Ghosh]

Hello,

Private vlan is not supported on 3550.

http://www.cisco.com/en/US/docs/switches/lan/catalyst3550/software/release/12.1_9_ea1/conf
iguration/guide/3550scg.html

In the Index, we can see that private VLANs are not shown here and the
alternative option is to use protected ports. The link to that is shown
below as well:

http://www.cisco.com/en/US/docs/switches/lan/catalyst3550/software/release/12.1_9_ea1/conf
iguration/guide/swintro.html#wpmkr1043109

note- protected ports are not a complete alternative to pvlan.

Even though the command is present under the vlan it is just sitting there and doing nothing.

have nice year ahead.

rgds,
Souvik

[Shashank Singh · Accepted solution]

Hi,

Private vlans are unsupported on 3550 platform. This is documented at the following link:

http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a0080094830.shtml

The options available under vlan are for defining private vlan association/type and make sense only if a port can be configured in a private vlan, and as evident, the ports cannot be configured under pvlan on this platform.

Hope this helps.

Shashank

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