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I think you're thinking about <a href="http://www.juniper.net/techpubs/en_US/junos13.3/topics/example/interfaces-aggregated-ethernet-plus-lacp-virtual-chassis-uplinks.html" rel="ugc">LACP</a><br />
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This allows for 2 or more ports to be bound...
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I think you're thinking about LACP [http://www.juniper.net/techpubs/en_US/junos13.3/topics/example/interfaces-aggregated-ethernet-plus-lacp-virtual-chassis-uplinks.html]

This allows for 2 or more ports to be bound...

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But without the aggregated link, RSTP will shut the new link down. Correct?
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But without the aggregated link, RSTP will shut the new link down. Correct?

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I have 2 virtual chassis with all ex4200 switcehs and currently they are connected with 1 link. What if I add another link between them. RSTP will shut the new link down. Correct? I need to configure integrated link to take advantage of 2Gbps link between the VC. Correct?
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I have 2 virtual chassis with all ex4200 switcehs and currently they are connected with 1 link. What if I add another link between them. RSTP will shut the new link down. Correct? I need to configure integrated link to take advantage of 2Gbps link between the VC. Correct?

2 links between virtual chassis on Juniper EX4200

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.

Switches / Hubs

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

Networking

Network design and methodology, also known as network architecture, is the design of a communication network. It is a framework for the specification of a network's physical components and their functional organization and configuration, its operational principles and procedures, as well as data formats used in its operation. In telecommunication, the specification of a network architecture may also include a detailed description of products and services delivered via a communications network, as well as detailed rate and billing structures under which services are compensated.