by Ted Haubein | Dec 17, 2021 | Data Center, High Availability, NX-OS, Routing, Switching
If your new to VPC or Virtual Port Channel this is a simple article that outlines the basic overall configuration along with some terms. A VPC or Virtual Port Channel is the ability to bond together multiple switches, so that they appear as a single switch from...
by Ted Haubein | Nov 15, 2013 | High Availability, Routing
Hot Standby Routing Protocol or HSRP is a Cisco’s proprietary Layer 2 method of providing high network availability by providing redundancy for IP hosts on an IEEE 802 LAN configured with a default gateway address. HSRP routes IP traffic without relying on the...
by Ted Haubein | Oct 15, 2013 | High Availability, Routing
Virtual Router Redundancy Protocol or VRRP is an open standard that eliminates a single point of failure inherent in the static default routed environment. VRRP specifies an election protocol that dynamically assigns responsibility for a virtual router. It’s a...
by Ted Haubein | Apr 15, 2013 | High Availability, Routing
Gateway Load Balancing Protocol or GLBP differs from Cisco Hot Standby Redundancy Protocol or HSRP and IETF RFC 3768 Virtual Router Redundancy Protocol or VRRP in that it has the ability to load balance over multiple gateways. Like HSRP and VRRP an election occurs,...
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...
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