Tag native VLAN globally

[richmorrow624]

I am trying to uplink 3com switches to Cisco 4503 switches.

When I try to tag the native VLAN in the interface configuration (of the port I want to trunk), it tells me the native vlan tagging is not enabled globally.

The configuration of the 4503's right now has all subnets as secondary interfaces, with the exception of VLAN 2.

I want to gradually implement the VLANS, if I enable tagging of the native VLAN (VLAN 1), is there any problem in doing this?

Is there any potential loss of connectivity to anything?

The new config is on g2/40.

Since almost everytthing is in VLAN 1, the only potential problem would be VLAN 2, the uplink to the PIX which is the Internet connectivity.

Is this correct?

Also, there are two 4503 switches linked together for redundancy. Uplinking the 3coms to both 4503 switches would require one trunk port on each 4503 to two ports on the 3com.

My only concern is to make sure STP is enabled on the 3com, it is already configured on the 4503's.

Is this correct?

[richmorrow624]

I changed the config earlier to port g2/40 to be access, so the uploaded config is not showing what I tried to get to work.

It was a trunk port and was showing active and was configured to allow all vlans

[sundar.palaniappan]

Configure g2/40 to be a trunk.

Then configure vlan 5 as follows.

config t

vlan 5

Check the status of int vlan 5 now.

[richmorrow624]

ok, I see I forgot that piece of it.

Rats, let me try that and see if it works.

Thanks duder

[richmorrow624]

That was it.

The response time pinging the native vlan is 78ms on the same switch.

Is this common?

Is the tagginging causing the slow response?

And is thee anything I can do about it.

Thanks again for the help

[sundar.palaniappan]

Glad to hear that :-)

Try to ping the IP from a device on the LAN instead of the originating the ping from the switch itself and check the RTT.

[richmorrow624]

Again, I really appreciate the help.

I was on a configured switchport of the new vlan from the 3com switch.

I was using a laptop configured with an ip address in the new vlan subnet.

78ms pinging the default vlan on the Cisco.

I will look into that later, but while you are listening:

I have two 4503 switches ehterchanneled together with HSRP, switch 1 priority for STP.

If I configure another trunk port for redundancy to the second 4503, is there anything I need to beware of before doing that othere than making sure STP is enabled?

[sundar.palaniappan · Accepted solution]

As long as STP is enabled on those trunks you don't have to worry about any loops or problems. STP would put one of the trunks in forwarding state and the other one in blocking state based on the port cost or MAC address.

HTH

Sundar

[richmorrow624]

Thanks Sundar