EIGRP INTERVIEW QUESTION.pdf - EIGRP(Enhanced Interior Gateway Routing Protocol Important points about EIGRP EIGRP is a Cisco proprietary protocol which


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SHARAFAT ALI Mob No. -8305012450 1 EIGRP (Enhanced Interior Gateway Routing Protocol) Important points about EIGRP EIGRP is a Cisco proprietary protocol which means it will work only on Cisco routers. EIGRP is also called advanced distance vector or Hybrid routing protocol. Multicast or unicast is used for exchange of information. Multiple network layer protocols are supported. 100% loop-free. By default, EIGRP will limit itself to use no more than 50% of the interface bandwidth. Maximum Hop-Count is 255[100 by default] EIGRP is classless protocol EIGRP supports VLSM and authentication EIGRP uses Diffusing Update Algorithm (DUAL) to determine the best path among all “feasible” paths. DUAL also helps ensure a loop-free routing environment. EIGRP will form neighbor relationships with adjacent routers in the same Autonomous System (AS) EIGRP uses RTP (Reliable Transport Protocol) and its function is to deliver EIGRP packets between neighbors in a reliable and ordered way. All EIGRP routing information are exchanged between neighbors via multicast using the address K-Values are used for calculating metric. By default EIGRP consider k1 and k3 only. EIGRP having internal Administrative distance as 90 and external AD as 170 EIGRP summary route AD value is 5. In EIGRP Summarization is enabled by default."No auto-summary" command is needed because by default EIGRP will behave like a classfull routing protocol which means it won’t advertise the s ubnet mask along the routing information. For example and will be advertised as and Disabling auto-summary will ensure EIGRP sends the subnet mask along. EIGRP converges rapidly after link failure. EIGRP can load balance on both equal and unequal cost paths."Variance" command is used to configure load balancing. EIGRP supports up to 6 loop-free paths with a metric lowers than the product of variance and the best metric. Manual summarization can be enabled at any interface. If a packet is not acknowledged, EIGRP re transmit the packet to the non responding neighbor as a unicast. No other traffic is sent to this neighbor until it responds. After 16 unacknowledged re- transmissions, the neighbor is removed from the neighbor table The process of neighbor discovery and route exchange between two EIGRP router is as follows :- Router A sends out a hello Router B sends back a hello and an update. The update contains routing information Router A acknowledges the update Router A sends its update Router B acknowledges
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SHARAFAT ALI Mob No. -8305012450 2 Advantages of EIGRP EIGRP uses AS (Autonomous system) number ranging from 1-65535 to identify collection of routers that share same information. EIGRP have less convergent time and is more efficient.
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  • Summer '20
  • Cisco Routers, Sharafat Ali

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