vlan mismatch

[francoisenjeroen]

Hi!

Situation:

- 4 Cat. 2950's are connected to each other. (uplink)

- The 4 cat. 2950 are connected to a 6509, by a ISL trunk.

- Cat. 6509 has no Layer 3 possabilities, we got a Cisco 3750 for this.

- Our management interfaces on the Cat. 2950's are in VLAN1. Beceause this is the only VLAN that is up (virtual)

- There are no ports in VLAN1 on the Cat. 6509.

- VTP is not running in our network.

Goal:

We try to make our management interfaces reacable in the Cat. 2950's for our network.

Problem:

Because the Cat. 6509 has no ports in Vlan1, the packets will be dropped, and we can't manage our Cat. 2950's.

Question:

Is there any solution to make this work properly?

Thanx in advance.

[lgijssel]

This would be the first set of 2950's that were capable of running ISL! The 2950 only supports vlan trunks over dot1Q. So you will not be able to exchange any vlan info over the trunk to the 6509.

That does not mean you cannot access vlan1. By default this is the native vlan and one of it's properties is that the traffic in this vlan is untagged. (std ethernet frames) Please note that this can be overruled by configuration but it should be possible to send this traffic over the native vlan on the 6509. The only requirement for this is that the packets are not tagged.

A better (this is what I would propose) solution would be to match native vlans on the network and/or use dot1Q on the 6509 also. You can change the management vlan on the 2950 to any other vlan.

Regards,

Leo

[francoisenjeroen]

Yes you are right, it's dot1q and not isl. A little confused...

[lgijssel]

The following might help you out:

http://www.cisco.com/en/US/tech/tk389/tk390/technologies_configuration_example09186a0080094784.shtml

Regards,

Leo