Due to the importance of EIGRP troubleshooting problems related to this protocol is an important ability for a network administrator. There are numerous commands that are important during EIGRP troubleshooting. The most used command for EIGRP troubleshooting is the “show ip eigrp neighbors”, “show ip route”, and “show ip protocols”. The commands can also be […]
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Network security is an important consideration for network administrators. The router install in a public network is at risk each time, anyone with a packet sniffer can read information propagating between routers. The router can be attacked through the interruption of peer devices or the falsifying of routing information. Interruption of peers is less critical […]
EIGRP is a Cisco proprietary protocol for routing. Router enabled EIGRP calculates the best route to a destination using the metric value that is based on the link bandwidth and delay. The protocol selects the shortest path and installed that path in the routing table. If the destination has more than one path with the same administrative distance and a […]
Hello Intervals and Hold Times – EIGRP for IPv4 EIGRP uses the Hello protocol to establish and maintain the connection to its neighbor. Hello protocol also monitors the established connection. It is sending Hello packet periodically to its neighbor. The rate at which EIGRP sends Hello Packet known is as the hello interval. The Hold […]
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 this with any currently supported routing protocols. Usually, the static default route is configured on the edge router where a network is connected to outside the EIGRP routing domain and propagate the default static […]
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 the 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 destination network. The topology […]
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 […]