Comments on: Cisco Catalyst and Juniper VLANs

By: mindonion

mindonion — Wed, 16 Feb 2011 08:31:09 +0000

No probs, I wasn’t sure whether to start a new topic or not because the question is so similar. New boy error

By: melanieyarbrough

melanieyarbrough — Mon, 14 Feb 2011 15:33:58 +0000

Hi MindOnion, Please start a new thread for your question to prevent confusion on this thread and to ensure that members see your question in order to answer it. Thanks! Melanie

By: mindonion

mindonion — Sun, 13 Feb 2011 19:32:47 +0000

I’ve got a Juniper Netscreen 25 and an old Cisco 2900XL switch with which I’m simply trying to set up a ‘router on a stick scenario’ and I can’t seem get the trunk working.

On the Cisco 2900 I’ve done the following: Created 3 vlans: 10, 20 & 30, assigned 5 ports to each vlan, set fa0/20 as the trunk port using 802.1q and assigned an IP to each vlan so I can ping test once complete.

On the Juniper I’ve: Created 3 sub interfaces eth1.1, 1.2 & 1.3, specified eth1 to use 802.1q, assigned an ip to each interface in the same subnet as the corresponding vlans on the Cisco, specified the same vlan tags as on the Cisco 2900, Made all 3 sub-interfaces members of the trust zone and I can’t get any traffic across the trunk. I’ve even resorted to changing the cable

Any help would be greatly appreciated.

By: sixball

sixball — Mon, 07 Feb 2011 14:06:03 +0000

Additionally, dont forget to add the proper native/tagging commands:

Switch1(config-if)#switchport trunk native vlan
Switch1(config-if)#switchport trunk allow vlan {all | add }

And as for the pings, be sure to give your management VLAN Interface an IP address…