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Vlan problem between HP and CISCO Switch

Hello all

we have a problem when we want to used VLAN between a Switch HP and a Switch CISCO. The CISCO Switch cannot see the VLAN configuring on the HP Switch. It's problably an 8021Q incompatibility ?

Have you an idea about the subject ?

Thanks for your help

5 REPLIES

Re: Vlan problem between HP and CISCO Switch

Hi Friend,

Which switches they are ?

They only know issue that I can share with you is that on HP switches, you have to manually TAG all the vlans to a 802.1q trunk. On the Cisco switch by default Vlan 1 is the native vlan. Just make another vlan and assign it as the native vlan on the trunk port. This will tag all the vlans going to the HP switch.

conf t

int fa x/y

switchport trunk encapsulation dot1Q

switchport mode trunk

switchport trunk native vlan

HTH,

-amit singh

New Member

Re: Vlan problem between HP and CISCO Switch

Which switches they are ?

CISCO2950 + HP2524

Thanks

Gold

Re: Vlan problem between HP and CISCO Switch

It depends on what you mean you can't see the vlans. I don't think hp supports cisco's vtp yet. The newer switches do support cdp.

If you mean it doesn't work then you need to set the vlan tagging correctly on the procurve.

I wouldn't mess with changing the native vlan to correct this.

The key is to add the vlan that is the native vlan untagged to the port on the HP switch. This is normally vlan 1. You then add all the other vlans to the port tagged.

Unlike cisco almost every other vendor requires you to add each vlan (either tagged or untagged) to a port manually. Cisco by default allows all vlans and uses vlan 1 for what he calls native which is what everyone else calls untagged.

New Member

Re: Vlan problem between HP and CISCO Switch

802.1q is a standard and both devices should support it.

Can you confirm that the Cisco is not running ISL,

Can we see a config of both device trunk configurations ?

Re: Vlan problem between HP and CISCO Switch

Hi Mike,

Original poster has already posted the cisco switch is 2950. This switch only supports 802.1q . It doesnot support ISL at all.

-amit singh

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