What is EIGRP (Enhanced Interior Gateway Protocol)?
The distance vector protocol is a refined version of the IGRP with the sole purpose.
It has the following features:
• RTP Yes (Trusted Transport Protocol)
• Maintains limited updates
• Broadcast update algorithm (DUAL)
• Establishing contiguities
• Preserves topology or neighboring tables
Data in an EIGRP message is included in a TLV-style data field (Type, Length, Value).
EIGRP Multiprotocol
EIGRP is capable of routing different protocols; some examples:
• IP
• IPX
• Apple Talk
This is due to individual protocol modules (PDMs) responsible for routing tasks specific to each network layer protocol.
For example:
The IP-EIGRP module sends and receives IP-coated EIGRP packets and uses DUAL to create and maintain the IP routing table. EIGRP uses different packages and provides separate neighbors, topology, and routing tables for each protocol in the Network layer.
The IPX EIGRP module exchanges routing information about IPX networks with other IPX routes.
RTP and EIGRP Package Types
The Trusted Transport Protocol is the protocol used by EIGRP to deliver and receive duplicate packets, which is designed to operate as a routing protocol that runs outside the network layer so that services such as UDP and TCP cannot be accessed.
Even if your name has a reliable word and it is possible to obtain a delivery through an unreliable ETPRP, you can identify these packages because a reliable RTP requires a confirmation of receipt that needs nothing.
RTP can send packets with UNICAST or MULTICAST; the latter uses a reserved address: 224.0.0.10
Routers with EIGRP can discover their neighbors through a package called “GREETING” In most networks, “greeting” packets are sent every 5 seconds and help keep the neighbors and their routes visible When the greeting is answered.
The wait time tells the router the maximum time it will wait before receiving the following “greet” before declaring its neighbor “inaccessible.”
As a rule, the waiting time is three times the salutation interval.
Wait time before reporting a router = “dead”
(It takes the router to send an e-mail) (3)
When the timeout expires, the route is declared inactive, and a new way is searched using queries.
Limited updates
EIGRP reserves some reserves as it does not send periodic updates on update packages, ONLY IN THE METRIC OF ROAD CHANGES.
It is worth noting that these updates are PARTIAL because when this happens, the entire contents of a table are not sent; only information about route changes is sent.
EIGRP also limits this route change information to the affected routers. The partial update is automatically updated to “limits,” so only routers that require this information.
Sending ONLY the necessary routing information and ONLY to the routers in need minimizes the bandwidth required to send packets.
Administrative Distance
The administrative distance is the “d” gree of reliability ın of the route.
EIGRP has 90 administrative distances for internal routes and 170 administrative distances for routes imported from an external source (including default routes)
Compared to other protocols, the EIGRP has less administrative distance; in other words, IT IS MORE RELIABLE.
Authentication
It accepts security settings and can encrypt and verify your routing information.
It is recommended that authentication is always performed on the transmitted routing information, ensuring that routers will only accept routing information from routers configured with the same password or authentication information.
Protocols such as:
· RIPv2
· OSPF
· IS-IS
· BGP
They also accept encryption in routing information.
