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Trunk issue between SF300 & 3560


We have purchased 3 no CISCO SF300-48P (Access Switches) with the interest of setting up a new laboratory consisting of 120 desktops. We currently have a CISCO 4507R   (Core Switch) and a CISCO 3560 (Distribution Switch) for the campus wide network. Our network is developed with various VLANS to support Internet and Intranet facilities.

The new lab need to be incorporated in to the Campus wide network with a new VLAN ID. But problem is while trunking the CISCO 3560 (Distribution switch) to the CISCO SF300-48P (Access Switch) communication does not happen. While, surfing the internet and various doc's say that SF300 uses GVRP instead of dot1q trunking. We, are also unable to locate any information about how these switches need to be communicated.

4 Replies 4

VIP Alumni
VIP Alumni


Look at page 190 in this book


—The interface is an untagged member of one VLAN at most, and

is a tagged member of zero or more VLANs. A port configured in this

mode is known as a trunk port.

Also look at

GVRP is a GARP application that provides IEEE 802.1Q-compliant VLAN pruning and dynamic VLAN creation on 802.1Q trunk ports. With GVRP, the switch can exchange VLAN configuration information with other GVRP switches, prune unnecessary broadcast and unknown unicast traffic, and dynamically create and manage VLANs on switches connected through 802.1Q trunk ports.

You should be able to configure your 3560 end to match the vlans on the SF300.

Something like :-

int fas 0/24
desc *** TRUNK TO SF300 ***
switchport trunk encapsulation dot1q
switchport mode trunk
switchport trunk allowed vlan 1-3,10,500,501,600,700,701,999



Please rate useful posts

Regards, Alex. Please rate useful posts.

We want to prepare dynamic VLAN on 3560 switch, but have a doubt that Can a switch exchange VLAN information having 802.1q with another switch having GVRP.

Hello Nirmesh, I can speak from the Sx300 point of view.

The Sx300 switch will not dynamically build VLAN without GVRP, which is disabled by default. The switch does not support any Cisco proprietary protocol aside CDP.

In other words, the VLAN configuration between the switches will need to be manually done.

-Tom Please mark answered for helpful posts



I want you to make sure u are not misunderstood between GVRP and 802.1Q

GVRP share VLAN information database between switches. and 802.1Q is Trunking/Tagging protocol.

So i guess you are using 802.1Q as trunking and for sharing VLAN infromation across the switch domain u implimented GVRP.

You should have Trunk ports basic configuration as mentioned by acampbell

You can add Speed, Duplex and Nonego to it...



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