by Ted Haubein | Jul 15, 2012 | Routing, Tunneling
Generic Routing Encapsulation or GRE for short provide a mechanism to transport packets of one protocol within another protocol usually TCP. The protocol that is carried across or encapsulated is referred to as the passenger protocol, and the protocol that is used for...
by Ted Haubein | Jul 1, 2012 | High Availability, Switching
The Cisco Definition Unidirectional Link Detection or UDLD is a Layer 2 protocol that works with the Layer 1 mechanisms to determine the physical status of a link. At Layer 1, auto-negotiation takes care of physical signaling and fault detection. UDLD performs tasks...
by Ted Haubein | Jun 15, 2012 | Routing
From the beginning the IPv4 header RFC 791 defined a 1 byte field called the Type of Service or ToS. The intent was to use this 1 byte field to mark packets for preferential treatment in conjunction with QoS. The ToS field was further divided into a high order 3 bits...
by Ted Haubein | May 31, 2012 | Switching
Cisco Tech Days The local Cisco Office in Kansas City hosted another great Tech Days presentation. I was especially excited about this event because they covered the features of the new Cisco 3850 Switch. This is the first line of Cisco Switches with an embedded...
by Ted Haubein | May 25, 2012 | Switching
The term EtherChannel or PortChannel is a a method of aggregation that allows multiple physical Ethernet links to be combined or bundled at Layer 2 into one logical interface or channel. Bundling Ethernet interfaces at Layer 2 is vary similar to that of PPP or MLFR...
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