Answer / manikandan

EIGRP - Useful in Cisco-only networks of basically any size.
EIGRP is an extremely robust and efficient protocol that
suits nearly any need other than inter-organization routing.


OSPF - Useful everywhere. It's standardized, so it's not
limited to a particular vendor. Most appropriate in large
multi-vendor networks. It has a higher CPU load than EIGRP
does, and it requires more granular control from an
administration perspective.

Answer / pranav

There are many differences between these two routing protocols.

1)Ospf is open standard and EIGRP is cisco propreitary.

2)Administrative distance for OSPF is 110 and for EIGRP(Internal Eigrp 90 & External Eigrp 170).

3)Ospf uses Cost as the metric values to calculate the shortest path wheres as EIGRP used 5 metric values
(Bandwidth,Delay,Load,MTU & Reliablity) to calculate the shortest path.

4)Eigrp use Dual algorithm for calculating shortest path where as Ospf use SPF algortithm fro calculating shortest path.

5)Eigrp use multicast address 224.0.0.10 where Ospf use multicast address 224.0.0.5 goes for all ospf routers and 224.0.0.6 goes for all DR and BDR

5)In OSPF, there is no Backup route options, wheres as in EIGRP it will maintain Backup route. So if main link goes down, it will directly take the backup route and starts working, where as in OSPF, if main route fails
it has to recalculate the shortest path.

Answer / vishal mahajan

eigrp is a cisco propitory protocol and it is combined the
advantage of link state and distance vector routing
protocol.eigrp has not the full picture of the
topology.eigrp used DUAL to select the best path.

ospf is a link state protocol and it has the full picture
of the network topology so that each router can select the
best path to each destination.

Answer / azhar

ospf is a link state protocol. eigrp is a distance vector
protocol


ospf uses bandwidth and delay metrics. eigrp uses bandwidth,
delay, load, reliability


ospf uses SPF algorithm to calculate the best path. EIGRP
uses Diffusing Update algorithm to calculate the best path.

Routing with ospf is done in Autonomous System, Areas, Stub
Areas and Backbone areas. Routing with EIGRP is done in
neighbor tables, topoligy tables and routing tables

no hope count in ospf. maximum hope count is 255 in eigrp.

Answer / 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

---------------------------------------------------
---------------------------------------------------

**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.

----------------------------------------------------------------------------------------------------------------------
**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.
----------------------------------------------------------------------------------------------------------------------
NOTE: AS number must be same to become part of that AS but Process-id can be different in one area.

Answer / rohit

EIGRP
* stands for Enhansed interior gateway routing protocol.
* Eigrp is the Distance Vector Routing Protocol.
* Eigrp is the classfull routing protocol.


OSPF

* OSPF stands for open shortest path first routing protocol.
* OSPF is the link state routing protocol.
* Ospf is the Classless routing protocol.

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