Name resolution for IPv6 addresses can be static or dynamic. Just as with IPv4, resolution of static names to IPv6 addresses can be manually configured in the host configuration file. […]
IPv6 Private Addressing – Internet Protocol Version 6 (IPv6) Design
IPv6 private addressing should be very limited compared to its use in IPv4. IPv6 private IP addresses are referred to as unique local addresses (ULAs) and use the prefix FC00::/7. […]
DNS64 – Internet Protocol Version 6 (IPv6) Design
With DNS64, as defined in RFC 6147, when an IPv6 AAAA resource record (RR) is not available, DNS64 enables the DNS server to synthesize an AAAA record from an IPv4 […]
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 […]
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 […]
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 […]
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 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 […]