Private VLAN between Cisco switch and other vendor switch or firewall

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Feb 5th, 2008
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Can anyone plz help me in understanding the tagging of private vlan on trunk ports.

I have a trunk link between nokia firewall and cisco 3750 switch, there are some servers in private vlan in the switch and need to communicate to a server behind the firewall, can just a trunk link between the firewall and the switch suffice (consider the firewall in not blocking any traffic)

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aghaznavi Mon, 02/11/2008 - 08:02
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Most non-Cisco 802.1q switches maintain only a single instance of spanning tree, known as Mono Spanning Tree (MST), that defines the spanning-tree topology for all VLANs. When a Cisco switch is connected to a non-Cisco switch through an 802.1q trunk, the MST of the non-Cisco switch and the native VLAN spanning tree of the Cisco switch combine in order to form a single spanning tree topology, known as the Common Spanning Tree (CST).

tmsundar81 Mon, 02/11/2008 - 08:38
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Thanks for the info but i need to understand the tagging between a cisco switch and a non cisco switch...say i have a private vlan on a cisco switch and i am connecting to a non cisco switch (nokia fw) and i ahave a trunk link between (only trunk link)between such case can a reach the private vlan from nokia fw via the trunk link

or do i need to have a seperate link for the private vlan between cisco switch and nokia fw (promiscuous port on cisco switch end)


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