Tag: switching

02

Jan2014

What are VTP Modes and how is it advertised?

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There are three modes of operation for VLAN Trunking Protocol (VTP) Server allows creation, modification, and deletion VLANs and specify other configuration parameters, such as VTP version and VTP pruning, for the entire VTP domain. VTP servers advertise their VLAN configuration to other switches in the same VTP domain and synchronize their ... Read More
January 2, 2014Praveen Bahethi

02

Jan2014

Why switch trunk/ tagged ports are used?

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Prior to 802.1q, switch vendors used proprietary methods to manage the transfer of VLAN tagged ethernet frames between switches.  These methods added the vlan to the frame  creating a proprietary frame.  Otherwise the other switch would put the frame in the vlan it's port was configured for. Each switch has the ... Read More
January 2, 2014Praveen Bahethi

28

Dec2013

Why do we use VLANs?

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Virtual Local Area Networks (VLAN) came about from the need to isolate broadcast domains with in a switch without using routers.  Router do not forward broadcasts, but back in the 90's they were not very fast compared to switches.  Router Layer 3 functions were done in processor and switch Layer ... Read More
December 28, 2013Praveen Bahethi

28

Dec2013

Why use link aggregation?

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Link aggregation protocols overcome spanning tree protocol's (STP) inherent design to block loops between switches by bundling of ports to appear as one logical connection to STP. With one logical connection, STP will not block the link but forward traffic.  Further the bundling can increase overall bandwidth between the switches. So ... Read More
December 28, 2013Praveen Bahethi