What is VRF route replication and why to use it? Route replication is an easy way to allow routes to replicate between virtual networks and clients who reside in one virtual network can reach prefixes that exist in another virtual network. Route replication is supported for Static, Enhanced Interior Gateway Read more…
What is GLBP and why to use it? Gateway Load Balancing Protocol (GLBP) is a Cisco proprietary protocol that attempts to overcome the limitations of existing redundant router protocols such as HSRP and VRRP by adding basic load balancing functionality. ARP requests sent by arp clients will be answered with Read more…
What is route redistribution and why to use it? Route redistribution is the process of sharing routes from one routing protocol and distribute them into another. By default, routers only advertise and share routes with other routers running the same protocol. As such if one router is configured for OSPF Read more…
What is HSRP and why to use it? Hot Standby Router Protocol (HSRP) is a Cisco proprietary redundancy protocol for establishing a fault-tolerant default gateway. The protocol establishes a framework between network routers in order to achieve default gateway failover if the primary gateway becomes inaccessible, in close association with a Read more…
What is BGP and why to use it? Border Gateway Protocol (BGP) is a standardized exterior gateway protocol designed to exchange routing and reachability information among autonomous systems (AS) on the Internet. The Border Gateway Protocol makes routing decisions based on paths, network policies, or rule-sets configured by a network Read more…
What is Policy-Based Routing and why to use it? Policy-based routing (PBR) is a technique used to make routing decisions based on policies set by the network administrator. When a router receives a packet it normally decides where to forward it based on the destination address in the packet, which Read more…
What is NAT and PAT and why to use them? Network Address Translation (NAT) in its most simple form is a method of translating a one IP address to another. For example a public IP address is translated to a private IP address and vice versa. Without NAT computers on Read more…
What are static routes and why to use them? Static routing is a form of routing that occurs when a router uses a manually-configured routing entry, rather than information from a dynamic routing traffic. In many cases, static routes are manually configured by a network administrator by adding in entries Read more…
What is OSPF and why to use it? Open Shortest Path First (OSPF) is interior gateway protocol (IGP) that makes use of a link state routing (LSR) algorithm. OSPF supports complex networks with multiple routers and may be structured, or subdivided, into routing areas to simplify administration and optimize traffic and Read more…
What is IP SLA and why to use it? ISP failover is the ability to failover from one ISP to another, or more specifically from one route to another, in order to ensure availability and access. In order to facilitate this functionality we must use a feature called IP SLA . IP Read more…