DEFAULT ROUTING

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STATIC ROUTING

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OSPF

Open Shortest Path First:

- It is a link state protocol

- Standard protocol

- It uses shortest path first or dijkistra algorithm

- Unlimited hop count

- Metric is cost (cost=10^8/B.W.)

- Administrative distance is 110

- It is a classless routing protocol (carry subnet mask information and supports VLSM)

- It supports equal cost load balancing

OSPF process in sever stages:

01 Down stage

02 Init stage

03 Two-way stage

04 Exstart stage

05 Exchange stage

06 Loading stage

07 Full stage

OSPF Router-ID:

It is used to identify the router inside the OSPF database.

OSPF identify using same ID in all directions.

It uses highest IP address of all active physical interface by default.

OSPF Tables:

Neighbor table – It contains list of directly connected routers

Database table –

It referred to as LSDB (Link state database)

It contains information about all the possible routes to the network with in the area

Routing table – It contains best route to the destination

Advantages of OSPF:

Open standard

No hop count limitations

Faster convergence

Disadvantages of OSPF:

Consume more CPU resources

Complex design rules

EIGRP

Enhanced Interior Gateway Routing Protocol:

- Advanced distance vector (Hybrid protocol)

- Standard protocol (initially it was cisco proprietary)

- Classless routing protocol (it carries subnet-mask, supports subnets / VLSM)

- Max Hop count is 255 (100 by default)

- Administrative distance is 90

- Easy and Flexible network design (unlike OSPF)

- Used Multicast (224.0.0.10) and unicast for initial neighbor discovery process

EIGRP Tables:

Neighbor table: It contains list of directly connected routers

Topology table: It list, all the best routes learned from each neighbor

Routing table: The best route to the destination

EIGRP Metic Parameters:

Bandwidth(K1) + Delay(K3) + Load(K2) + Reliability(K4) + MTU(K5)

By default uses bandwidth and delay in the metric calculation.

Choosing the best route based on least cost.