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// = 200; google_ad_height = 200; // ]]> As we mentioned in one of our previous posts, STP was developed to allow redundancy in the L2 network while maintaining a loop free network. Today we are going to discover how STP is actually doing this function. Step1: Electing the root bridge What is the root [...]

Spanning tree protocol or STP is used to provide redundant links in the network while preventing the danger of bridging loops. Our network below has two switches connected to each other by two FastEthernet links for redundancy. In such setups STP is essential to avoid bridging loops. The Problem:How bridging loops happen ? (STP is [...]

Etherchannel is a very effective feature that provides redundancy and load distribution within your switching network. However failing to choose the right load distribution algorithm my leave you under utilizing your network resources. We are going to analyze how to select the load balancing method based on placement of switch and traffic type that needs [...]

Extended VLANs are VLANs within the range of 1006 to 4094. They are mainly used in service provider networks to allow the provisioning of number of customers. In order to configure an extended VLAN you have to follow the guideline below: Extended VLANs are used just like normal VLANs; only different range. Extended VLANs must [...]

By default all VLANs configured on a switch are allowed over all trunking interfaces. Sometimes you need to change the allowed list over a specific trunk. When a VLAN is allowed on a trunk, traffic coming from interfaces belonging to this VLAN is allowed to traverse the trunk. In our example we have R1 and [...]

A trunk port is a layer 2 port that may carry traffic from multiple VLANs. Trunk ports are mostly used to connect two switches, switch and a router for inter-vlan routing or a server. Cisco switches support two types of trunking encapsulation protocols as listed below 1- ISL : frames are fully encapsulated with an [...]