If you have completed the previous section discussed protocols RIP (routing information) and now it's time to indulge further in the Cisco EIGRP (Enhanced Interior Gateway Routing Protocol), introduced the wonderful world.
Cisco Routing protocols EIGRP is owner, means that it is only found on the Cisco device. You cannot run EIGRP Juniper or Adtran or any other router EIGRP is proprietary (Cisco). When you use Cisco networking between suppliers of all no obligation when EIGRP is usually select the protocols to route. EIGRP supports the use of multiple IP, IPX, AppleTalk routing protocols.
EIGRP has been removed from its predecessor; internal routing routing (Gateway Protocol), is a classful routing protocols such as RIPv1. Published routing does not have the update mask while EIGRP is Classless and supports VLSM (variable length subnet mask) routed subnet using EIGRP uses a 32-bit 24-bit measurement metrics. When you are on the same router running EIGRP routing uses the same autonomous system number (#), and routes are automatically redistributed between protocols and EIGRP EIGRP metric is accordingly adjusted.
EIGRP maintains three separate the tables, neighbors, topology table and routing table;
Neighbor table provides specific router has formed relationships with neighbours listing of all neighboring routers. Neighbors to Exchange routing information and how to ensure that a neighbor is still rising.
Topology table is basically adopted in which to store the neighbors learned of all the destination routing routing database. Table routing topologies can be marked with a "p" passive, which means that the course is stable. No longer satisfy the feasibility condition and are actively searching to replace a subsequent route by querying the neighboring router's routing routing is marked as "a" activities. If subsequent routes have a viable successor, routing never marked active for your router will have a backup route fault tolerance back to primary schools (subsequent route) case of failure. Convergence time is very low.
If a route down the mountain and there is no feasible successor route, EIGRP will query the routers in a row, failed to see if there is an alternate route to route. In a poorly designed network, EIGRP queries can be the collapse of the network, EIGRP routes can become SIA (stuck in the initiative). If a query response, within the allotted time had not received back from the router (SIA timer: 180 seconds by default) to delete a neighbor relationship and no route associated with the neighbourhood's removal causes the datagrams that are discarded when re-convergent network.
By using five separate value known as k-valued formulas, calculate the EIGRP metric. By default only the k values 1 and 3 are used (bandwidth and latency), K2, K4, K5 is set to 0. EIGRP metric formulas and k values are defined as follows;
EIGRP Metric = 256*((K1*Bw) + (K2*Bw)/(256-Load) + K3*Delay)*(K5/(Reliability + K4)))
K1 = Bandwidth
K2 = Load
K3 = Delay
K4 = Reliability
K5 = Maximum Transmission Unit (MTU)
So if you use the order of operations you can deduce the equation down to
EIGRP Metric = 256(Bandwidth + Delay)
Now, keep in mind that the bandwidth and latency formula derived from these variables. To determine the maximum bandwidth of bandwidth will be divided from the interface bandwidth. To determine the delay you will divide the interface 10 such as EIGRP metric to use ten microseconds in its calculations. See the formula below;
Bandwidth = (10^7/Bandwidth in Kbps)
Delay = 10/uSec
So if you want to determine the composite metric of a T1 link at 1.544Mbs (1544Kbps) you’ll need to get the bandwidth and delay variables first then plug those into the EIGRP metric calculation formula as shown below; Keep in mind the delay on a T1 serial interface is 20000uSec (20,000 Microseconds)
Bandwidth = (10^7/1544) = 6476.68 == 6476 (rounded down)
Delay = (10/20000) = 2000
EIGRP Metric = 256*(6476 + 2000) = 2169856
Now that you have a basic understanding of the operation of EIGRP, let us enter the lab configuration section. Many commands to configure EIGRP is similar to configuring RIP. # Your process using router EIGRP EIGRP routers
# As (autonomous system) was a new concept. Autonomous systems are defined by multiple network devices controlled by a single entity or entities shared common routing strategy for collection. But you can have multiple autonomous systems such as under the same organizational control; multiple sites or facilities in the national or world-wide interconnected but isolated for administrative purposes.
RIPv2, EIGRP is enabled by default on the automatic summary. Unless you disable automatic summarization in EIGRP routing process allows a router will be summarized in the category network boundaries.
When specified in the routing process to participate in the network, you must use a wildcard mask. This is the reverse of a subnet mask notation. So if a subnet mask is 255.255.255.0 (11111111.11111111.11111111.00000000), then you flip, 1 to 0 and from 0 to 1, and the wildcard mask 0.0.0.255 (00000000.00000000.00000000.11111111)
Specifies that when a network statement under EIGRP routing processes, please bear in mind that the network does not specify that you specify will be published in EIGRP autonomous system network, EIGRP, however specify which interface's IP network range of addresses that belong to the specified network. As he says, if you have 10.80.0.0 which means 10.80.0.0/8 any interface has an IP address in the network will participate in the EIGRP routing process. If 10.80.0.0 is specified, you have 10.20.30.1/24 serial zero-zero interface, such as subnet masks that are derived from the EIGRP routing process network 0.255.. EIGRP no ads will be 10.20.30.0/24 and 10.80.0.0/8, because the statement did not specify the network advertising network, only during which interfaces to the routing.
It is based on IP addresses for the specified interface, into the host's IP address to prevent interface that does not require participation in the future when you add a new interface best practices along the route. In this case the router configuration mode, you will specify a network statement 10.20.30.1. This will prevent the interface with IP address 10.30.22.1/24 to participate in the routing process, if you use a network 10.80.0.0 statements.
RIPv2, static can be specified using the neighbor x.x.x.x command in router configuration mode to configure EIGRP operations over NBMA networks such as frame relay neighbors. By default EIGRP Hello multicast datagrams sent to 224.0.0.10 using the IP protocol 88 and the TTL is 1
By using the show IP EIGRP neighbor command, you can view a specific router has formed with adjacent neighbors. This command also displays other important information, such as the interface's neighbor learning by doing, SRTT is sent to a neighbor and recognized the need to come back and receive updates. Timeouts are EIGRP sends hello data if you do not receive confirmation of the interval. "Q" (queue count) is specific to EIGRP has been queued will be sent to the neighbor and the neighbor's uptime, number of updates.
Another command show IP EIGRP neighbor was similar to the show IP EIGRP interface, which displays on topics such as EIGRP neighbor through a particular interface, the transmission queue, each average SRTT and suspend route learned detailed information about interfaces.
8 Laboratory will use the following diagram looks like this;
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