Did you mean:. All Community This category This board. Cisco Community : Technology and Support : Networking : Switching : how many trunks are allowed in a switch? Regards, Noob Solved! Labels: Labels: Other Switching. I have this problem too. All forum topics Previous Topic Next Topic. Accepted Solutions. Peter Paluch. Hall of Fame Cisco Employee. Jon Marshall. VIP Community Legend. In response to Peter Paluch. It is more common now with virtualisation where you can have multiple virtual servers in the same physical chassis q2 every port on your switch can be a trunk if that is what you want.
So yes what you describe is what happens. In response to Jon Marshall. Dear all, Thanks for your valuable answers. Scenario 1 1 Host1 mac -a. Scenario 2 1 Host1 mac -a.
Q4 For all my 3 scenarios above, are they right? Why would it need to be store elsewhere while the frame is being processed? Regards, Noob. Hi Jon, However on thinking about it using the mac address table wouldn't work because for ports with connected devices that the switch has not yet recorded the mac address there won't be an entry and if a broadcast is to be sent the switch has to know which ports to send it out of.
Just think of a router-on-stick connected to a switch over a trunk. Best regards, Peter. Hi Peter Yes, that is one of nice observations showing that using the MAC address table to determine the VLAN membership is not the proper way of doing things Okay we are not talking about what vlan the frame is in, because, as already covered, that is determined when the switch receives the frame. As for documentation not being of particular interest to most people, it most certainly is to me :- Jon.
Hi Jon, But doesn't your second point in the last post somewhat contradict the above statement ie. When you are next at Cisco can you try and get any internal documents on switch architecture because it is one of those things that has always intrigued me :- Jon.
Jon, So the lookup using the vlan ID is only for optimisation and nothing else? These seem to be contradicting each other somewhat. Perhaps I am just not quite understanding? Dear all, I am abit lost in the conversation between the experts here. Can i check if the discussion is about the following below 1 vlan membership is given by its configuration and not be referencing to the mac address forwarding table.
You configure an asymmetric link from a tunnel port on a service provider edge switch to an Packets entering the tunnel port on the edge switch, already The double-tagged packets go through the service-provider network keeping the original customer VLANs separate from those of other customers. At the outbound interface, also a tunnel port, the metro tag is removed, and the original VLAN numbers from the customer network are retrieved.
Tunnel ports cannot be trunk ports or access ports and must belong to a VLAN unique for each customer. Note To return an interface to its default configuration, use the default interface interface-id interface configuration command.
A trunk is a point-to-point link between one or more Ethernet switch interfaces and another networking device such as a router or a switch. You can set an interface as trunking or nontrunking or to negotiate trunking with the neighboring interface.
To autonegotiate trunking, the interfaces must be in the same VTP domain. Use the steps outlined in the following table to configure a port as an ISL or The default mode for Layer 2 interfaces is switchport mode dynamic desirable. If the neighboring interface supports trunking and is configured to allow trunking, the link is a Layer 2 trunk or, if the interface is currently in Layer 3 mode, it becomes a Layer 2 trunk when you enter the switchport interface configuration command.
Configure the port to support ISL or You must configure each end of the link with the same encapsulation type. Configure the interface as a Layer 2 trunk required only if the interface is currently a Layer 2. To continue this discussion, please ask a new question. Get answers from your peers along with millions of IT pros who visit Spiceworks.
And can you have 2 truck ports on 1 switch? Edited Apr 13, at UTC. Popular Topics in General Networking. Spiceworks Help Desk.
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SuperLowkey This person is a verified professional. Verify your account to enable IT peers to see that you are a professional. Ok, and this port channel exists only on that switch with 2 trunk ports? We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting.
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Join Sign In. Sample Chapter is provided courtesy of Cisco Press. Date: Oct 25, Trunk links provide VLAN identification for frames traveling between switches.
Certain types of switches can negotiate trunk links. Trunk links must be configured to allow trunking on each end of the link. To enable trunking between the switches, use the following steps: Enable trunking on a port. TIP It is important to remember that not all switches support DTP and might not establish a trunk without intervention.
NOTE When enabling trunking, it is not possible to specify a range of ports. NOTE Not all switches allow you to negotiate a trunk encapsulation setting. Overview Pearson Education, Inc. Collection and Use of Information To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including: Questions and Inquiries For inquiries and questions, we collect the inquiry or question, together with name, contact details email address, phone number and mailing address and any other additional information voluntarily submitted to us through a Contact Us form or an email.
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