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ACE: Can the ft-vlan port be used for other vlans or not?

Hi People,

I am a bit confused reading cisco's documentation. I am now using the ft-vlan in a dedicated port (no other vlans), but I would like to use it as a normal port in order to use it in a context.

From cisco website:

"You cannot use this dedicated FT VLAN Ethernet port for normal network traffic; it must be dedicated for redundancy only.

When you specify an Ethernet port or a port-channel interface as a dedicated FT VLAN, you have the option to either configure the dedicated VLAN as the only VLAN associated with the Ethernet port or port-channel interface, or to allocate it as part of a VLAN trunk link (see "(config-if) switchport trunk allowed vlan"). Note that the ACE automatically includes the FT VLAN in the VLAN trunk link. If you choose to configure VLAN trunking, it is not necessary for you to assign the FT VLAN in the trunk link along with the other VLANs."

First it says, you cannot use this port for other traffic, and then it says this port can be a trunk port. If the port is trunk, then obviously you pass other vlans too. Right? or not? So can the port that has the ft-vlan be used in a context with other vlans?

thanks,

george

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1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: ACE: Can the ft-vlan port be used for other vlans or not?

Then simply do not use the 'ft-port' command.

This command "auto" configure the interface to be switchtrunk with one vlan  allowed.

If you reconfigure the interface with your own switchport command, all you risk is some kind of collision or a future software version which will deny this kind of configuration.

Here is what I use to have vlan 500 part of a normal trunk interface.

But be aware, that if your interface is overloaded, FT traffic could get dropped and therefore you will end up with 2 active units causing major traffic disuption.

This is why we recommend to run FT on its own interface with no other traffic.

Generating configuration....
interface gigabitEthernet 1/1
  switchport access vlan 1000
  shutdown
interface gigabitEthernet 1/2
  shutdown
interface gigabitEthernet 1/3
  switchport trunk native vlan 20
  switchport trunk allowed vlan 10-500
  no shutdown
interface gigabitEthernet 1/4
  shutdown

ft interface vlan 500
  ip address 192.168.77.2 255.255.255.0
  peer ip address 192.168.77.1 255.255.255.0
  no shutdown

Gilles.

4 REPLIES
Cisco Employee

Re: ACE: Can the ft-vlan port be used for other vlans or not?

The FT interface is a trunk interface with a single vlan allowed - the ft vlan.

Gilles.

New Member

Re: ACE: Can the ft-vlan port be used for other vlans or not?

in the paper here:

http://www.cisco.com/en/US/prod/collateral/contnetw/ps5719/ps7027/ps8361/guide_c07-572616_ps7027_Products_White_Paper.html

he has the following configuration

interface port-channel 1

ft-port vlan 1032

switchport trunk native vlan 617

switchport trunk allowed vlan 617,664,692,999

port-channel load-balance src-dst-port

no shutdown
so it seems that you can pass other vlans from the same port that the ft vlan passes. Do you agree?
Cisco Employee

Re: ACE: Can the ft-vlan port be used for other vlans or not?

Then simply do not use the 'ft-port' command.

This command "auto" configure the interface to be switchtrunk with one vlan  allowed.

If you reconfigure the interface with your own switchport command, all you risk is some kind of collision or a future software version which will deny this kind of configuration.

Here is what I use to have vlan 500 part of a normal trunk interface.

But be aware, that if your interface is overloaded, FT traffic could get dropped and therefore you will end up with 2 active units causing major traffic disuption.

This is why we recommend to run FT on its own interface with no other traffic.

Generating configuration....
interface gigabitEthernet 1/1
  switchport access vlan 1000
  shutdown
interface gigabitEthernet 1/2
  shutdown
interface gigabitEthernet 1/3
  switchport trunk native vlan 20
  switchport trunk allowed vlan 10-500
  no shutdown
interface gigabitEthernet 1/4
  shutdown

ft interface vlan 500
  ip address 192.168.77.2 255.255.255.0
  peer ip address 192.168.77.1 255.255.255.0
  no shutdown

Gilles.

New Member

Re: ACE: Can the ft-vlan port be used for other vlans or not?

thanks a lot, it was confusing, even the example from cisco.

now it's clear.

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