Enhanced Interior Gateway Routing Protocol (EIGRP) is a Cisco-proprietary hybrid routing protocol that contains features of distance-vector and link-state routing protocols. EIGRP maintains all of the advantages of distance-vector protocols, while avoiding the concurrent disadvantages. The router then restarts by sending the next three packets over path 1, and so on.When you initially configure EIGRP, remember these two basic rules if you are attempting to influence EIGRP metrics:The bandwidth should always be set to the real bandwidth of the interface; multipoint serial links and other mismatched media speed situations are the exceptions to this rule.The delay should always be used to influence EIGRP routing decisions.Because EIGRP uses the interface bandwidth to determine the rate at which to send packets, it is important that these be set correctly.
If the Hold column usually has a wider range - between 120 and 180 seconds - the hello interval is 60 seconds and the hold time is 180 seconds. For instance, all the routers in the network in Figure 1 are running Routing Information Protocol (RIP). Wir zeigen, wie Admins ...Viele Unternehmen mussten in den letzten Monaten überstürzt Entscheidungen treffen. Enhanced Interior Gateway Routing Protocol (EIGRP) is an interior gateway protocol suited for many different topologies and media. Der Grundbefehl zur Überprüfung des Status und Der Beginn der Fehlerbehebung beim Enhanced Interior Gateway Routing-Protokoll (EIGRP) und anderen Routing-Protokollen ist Show-IP-Protokolle.
Enhanced Interior Gateway Routing Protocol (EIGRP) (Page 1 of 2) Cisco Systems, a leader in the world of internetworking and routing technology, developed the Interior Gateway Routing Protocol (IGRP) in the mid-1980s as an alternative protocol to RIP for use in TCP/IP autonomous systems. Both are owned by Cisco and operate only on their devices. Instead, it builds a second table, the topology table, from which it installs routes in the routing table.To see the basic format of the topology table on a router running EIGRP, issue the lowest bandwidth on the path to this destination as reported by the upstream neighborFeasible and reported distance are discussed later in this section.EIGRP uses the minimum bandwidth on the path to a destination network and the total delay to compute routing metrics.
Similar to 2, but it also means there is a query origin string which describes the queries outstanding for this path.If the route is external, the following information is included.
The variance is set to 1 by default, which means load balancing on equal cost paths. (1994, May). Feasible successors are also recorded in the topology table.
© 2020 Cisco and/or its affiliates. For example, if the link to the network attached to Router Three goes down, Router Three marks the route unreachable and queries Router Two for a new path:Router Two replies that this network is unreachable and launches a query into autonomous system 200 toward Router One. Router Two chooses the path to Network A by examining the hop count through each available path.Since the path through Router Three is three hops, and the path through Router One is two hops, Router Two chooses the path through One and discards the information it learned through Three.
Example of setting up EIGRP on a Cisco IOS router for a EIGRP routing information exchanged to a router from another router within the same autonomous system has a default Cisco Systems now classifies EIGRP as a distance vector routing protocol, but it is normally said to be a hybrid routing protocol.EIGRP associates six different vector metrics with each route and considers only four of the vector metrics in computing the Composite metric: If, however, Router Three receives a query or update (such as a metric change) from Router One for the destination 10.1.2.0/24, it does not send a query back to Router One, because Router One is its successor to this network. Dividing a value of 10A feasible successor for a particular destination is a next hop router that is guaranteed not to be a part of a Thus, every successor is also a feasible successor.
Also, when performing unequal-cost load-balancing (balancing the network traffic in inverse proportion to the cost of the routes), the feasible successors are used as next hops in the routing table for the load-balanced destination. EIGRP, however, can also load-balance over unequal cost links.Let us say there are four paths to a given destination, and the metrics for these paths are:The router, by default, places traffic on both path 1 and 2.
When Router One learns about Network A from Router Two, it advertises Network A as unreachable through its link to Routers Two and Three. Router One then receives the query from Router Two.
Let us use Figure 19 as an example.Router Three has a distribute-list applied against its serial interfaces that only permits it to advertise Network B.Routers One and Two do not know that Network A is reachable through Router Three (Router Three is not used as a transit point between Routers One and Two).Router Three uses Router One as its preferred path to Network A, and does not use Router Two as a feasible successor.When Router One loses its connection to Network A, it marks the route as unreachable and sends a query to Router Three. In fact, this method of bounding a query may worsen the problem by preventing the auto-summarization of routes that would otherwise be summarized (external routes are not summarized unless there is an external component in that major network).Rather than block the propagation of a query, distribution lists in EIGRP mark any query reply as unreachable.
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