what is the difference between eigrp and ospf
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Answer Posted / sunil kumar singh
EIGRP OSPF
TYPE Hyprid Link state
METRIC Bandwidth, Cost(Bandwidth)
delay,
reliability,
load, MTU
AD 90 110
HOPS LIMIT 100 default 100 default
Max 255 Max 224
CONVERGENCE Very fast Fast
UPDATE TIMERS Hellos 5sec Hellos 10 sec
Holdtime 15 sec Holdtime 40 sec
CLASSLESS & VLSM Yes Yes
ALGORITHM DUAL Dijkstra
UPDATE ADDRES 224.0.0.10 224.0.0.5(DR-BDR to all)
224.0.0.6 (all to DR-BDR)
Hierarchy concept Based on AS number Based on
area
Load Balance By default Upto 4 UPTO 6 router
equal cost but can
be done upto 16 router.
Unequal load balancing
also supported
Must be same AREA NO Yes
IP MTU must match NO Yes
K-values must match Yes No
Router-id must be unique NO Yes
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**EIGRP :**
->Route UPDATES are sent First time(when neighbor adjacency established) complete Routing table then Only changes are advertised.
->Tables:
1.Neighbor Table
2.Topology Table
3.Routing Table
It maintains table differently for different protocols. Eg.ip, ipx, appletalk(different table for IP and different table for others).
-> It support datalink layer protocol also.
-> It uses RTP protocol(cisco proprietary) for relable transmission.
->
Condition of neighbor table :
.should exchange hello packets
.Same AS
.Metrics should be Identical
.Authentication process
->AD, FD, SD, FSD used for calculating topology table.
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**OSPF** :
->Tables:
1.Neighbor Table
2.Topology Table(contains LSDB ie. Raw data that cann’t be used by routing table directly, it is processoed by routing algorithm then best route is stored in routing table).
3.Routing Table
->Condition to become neighbor router :
.same hello and dead timer
. same subnet mask
.same area ID
.Authentication type and password
->It elects DR and BDR for each area.
->All traffics from other than area0 goeas via area0.
->It follows complex neighbor relationship process.
Every router is connected to these DR and BDR routers and communicates only with them, not with each other.
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NOTE: AS number must be same to become part of that AS but Process-id can be different in one area.
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