EIGRP is a Cisco proprietary routing protocol. Router-enabled EIGRP calculates the best route to a destination using the metric value based on the link bandwidth and delay. The protocol selects the shortest path and installs that path in the routing table. If the destination has more than one path with the same administrative distance and… Read more
Hello Intervals and Hold Times – EIGRP for IPv4 EIGRP uses the Hello protocol to establish and maintain a connection with its neighbor and monitor the established connection. It sends a Hello packet periodically to its neighbor. The rate at which EIGRP sends a Hello Packet is known as the Hello interval. The Hold timer
EIGRP Bandwidth for IPv4 EIGRP utilizes 50 % of an interface’s bandwidth for EIGRP information by default. Utilizing a half interface bandwidth not allowing enough bandwidth for the routing of normal traffic and prevents the EIGRP process from over-utilizing a link. We can change to default bandwidth utilization ratio using the command “ip bandwidth-percent eigrp”.
The IP address 0.0.0.0/0 is reserved for the default static route. The default route is not routing protocol-dependent; we can use it with any currently supported routing protocol. Usually, the static default route is configured on the edge router, where a network is connected outside the EIGRP routing domain and propagates the default static route
How to Propagate the Default Static Route using EIGRP Read More »
We can configure manual summary routes without enabling the auto-summary. We can also use a manual summary if auto-summary is enabled because EIGRP is a classless routing protocol. Classless routing protocol includes the subnet mask in the routing update; therefore we can configure manual summarization using the supernet routes. In supernetting, we can aggregate multiple
Route summarization is the most common tuning method of EIGRP. It allows a router to group multiple networks and advertises them as one large group using a single, summarized route. The capability to summarize routes is very important due to the rapid growth of networks. Route summarization reduces the number of routes in a larger
The EIGRP topology table contains all of the information about all known routes received from EIGRP neighbors. As an EIGRP router learns routes from its neighbors, those routes are stored in its EIGRP topology table. If a neighbor is advertising a possible route, it has to be using that route to forward packets to the
Successor -A successor route is the best route to a destination network. EIGRP uses the successor route to forward traffic to a destination. This is the router which is stored in the routing table. A successor route is based on the advertised distance from the neighbor. A successor route is a least-cost route to the
Successor, Feasible Successor and Feasible Distance Read More »
The diffusing update algorithm (DUAL) is the algorithm used by EIGRP routing protocol to make sure that a given route is recalculated globally whenever it might cause a routing loop. It is guarantees loop-free and backup paths throughout the routing domain. EIGRP store all available backup routes using diffusing update algorithm and then adapt the