Deployment of IPv6 can be done in one of the following models: Dual-Stack Model In the dual-stack model, devices and the network routers and switches all run both IPv4 and […]
IPv6 Deployment Model Comparison – Internet Protocol Version 6 (IPv6) Design
Table 2-13 summarizes the advantages and disadvantages of the IPv6 deployment models. Table 2-13 IPv6 Deployment Model Comparison IPv6 Deployment Model Advantages Disadvantages Dual-stack model Tunneling not required. Network […]
Routing Protocol Characteristics – Routing Protocol Characteristics, EIGRP, and IS-IS
This section discusses the different types and characteristics of routing protocols. Routing protocols have the following characteristics: This section covers the default administrative distances assigned to routes learned from each […]
Interior Versus Exterior Routing Protocols – Routing Protocol Characteristics, EIGRP, and IS-IS
Routing protocols can be categorized as interior gateway protocols (IGPs) or exterior gateway protocols (EGPs). IGPs are meant for routing within an organization’s administrative domain (in other words, the organization’s […]
Link-State Routing Protocols – Routing Protocol Characteristics, EIGRP, and IS-IS
Link-state routing protocols address some of the limitations of distance-vector protocols. When running a link-state routing protocol, routers originate information about themselves (IP addresses), their connected links (the number and […]
Classless Versus Classful Routing Protocols – Routing Protocol Characteristics, EIGRP, and IS-IS
Routing protocols can be classified based on their support of variable-length subnet masking (VLSM) and classless interdomain routing (CIDR). Classful routing protocols do not advertise subnet masks in their routing […]
Administrative Distance – Routing Protocol Characteristics, EIGRP, and IS-IS
On Cisco routers running more than one routing protocol, it is possible for two different routing protocols to have a route to the same destination. Cisco routers assign each routing […]
Routing Protocol Metrics and Loop Prevention – Routing Protocol Characteristics, EIGRP, and IS-IS
Routing protocols use metrics to determine best routes to a destination. Some routing protocols use a combination of metrics to build a composite metric for best path selection. This section […]
Cost – Routing Protocol Characteristics, EIGRP, and IS-IS
Cost is the metric used by OSPF and IS-IS. In OSPF on a Cisco router, a link’s default cost is derived from the interface’s bandwidth. Cisco’s implementation of IS-IS assigns […]
Reliability – Routing Protocol Characteristics, EIGRP, and IS-IS
The reliability parameter is the dependability of a network link. Some WAN links tend to go up and down throughout the day. These links get a small reliability rating. Reliability […]