Poison reverse is a route update sent out an interface with an infinite metric for routes learned (received) from the same interface. Poison reverse simply indicates that the learned route […]
EIGRP Components – Routing Protocol Characteristics, EIGRP, and IS-IS
EIGRP is characterized by four components: You should know the role of the EIGRP components, which are described in the following sections. Protocol-Dependent Modules EIGRP uses different modules that independently […]
DUAL – Routing Protocol Characteristics, EIGRP, and IS-IS
EIGRP implements DUAL to select paths and guarantee freedom from routing loops. J. J. Garcia Luna-Aceves developed DUAL, which is mathematically proven to result in a loop-free topology, providing no […]
EIGRP Timers – Routing Protocol Characteristics, EIGRP, and IS-IS
EIGRP sends updates only when necessary and sends them only to neighboring routers. There is no periodic update timer. EIGRP uses hello packets to learn of neighboring routers. On high-speed […]
EIGRP Packet Types – Routing Protocol Characteristics, EIGRP, and IS-IS
EIGRP uses five packet types: EIGRP Design When designing a network with EIGRP, remember that it supports VLSM and network summarization. EIGRP allows for the summarization of routes in a […]
EIGRP Scaling Techniques – Routing Protocol Characteristics, EIGRP, and IS-IS
EIGRP is tolerant of topologies that are not hierarchical for small and medium networks. If the network is large, say more than 1000 routers, there are two possible solutions: EIGRP […]
EIGRP for IPv4 Summary – Routing Protocol Characteristics, EIGRP, and IS-IS
The characteristics of EIGRP for IPv4 are as follows: EIGRP for IPv6 (EIGRPv6) Networks EIGRP was originally an IPv4 routing protocol, although Cisco has developed IPv6 support into EIGRP to […]
EIGRP for IPv6 Design – Routing Protocol Characteristics, EIGRP, and IS-IS
Use EIGRP for IPv6 in large geographic IPv6 networks. EIGRP’s diameter can scale up to 255 hops, but this network diameter is not recommended. EIGRP authentication can be used instead […]
IS-IS – Routing Protocol Characteristics, EIGRP, and IS-IS
Intermediate System-to-Intermediate System (IS-IS) is an International Organization for Standardization (ISO) dynamic routing specification. IS-IS is described in ISO/IEC 10589, reprinted by the Internet Engineering Task Force (IETF) as RFC […]