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[abaidcisco]

EIGRP (Enhance Interior Gateway Routing Protocol)

Why would we use EIGRP?

1: Biggest advantage of EIGRP is Backup route

2: Simple in configuration

3: Flexibility in Summarization

4: Unequal Cost Load balancing advantage

5: Combination of distance vector and link state protocol and Cisco call it Hybrid protocol

6: Support multiple Routing protocol

EIGRP Tables and Terminology

Tables

EIGRP made three tables in its data base

1: Neighbor Table

2: Topology Table

3: Routing tables

Terminology

1: Feasible distance (FD) (Total distance of the destination)

2: Advertised distance (AD) (Total distance from source neighbor to destination)

3: Successor (That’s the primary path to reach the destination)

4: Feasible Successor (That’s the backup path of the destination)

5: Active Route (Active when primary path is disable)

6: Passive Route (Every thing is fine. It means the primary path is stable)

* To be considered a feasible successor, the AD must be less than the FD of the successor

Verification Command

R1#show ip eigrp topology

Visiting the Friendly EIGRP neighbor(EIGRP packet information)

1: Hello: Create Relationship with the neighbor

2: Update: Send updates (not complete routing table only send update)

3: Query: Ask about Routes to neighbors

4: Reply: Response to a Query

5: Ack: Acknowledge the update, Query and reply

Understand EIGRP metric Calculation

What is metric? It means who good that path is?

1: Bandwidth

2: Delay

3: Reliability

4: Loading

5: MTU

Bandwidth and delay is statically and reliability, loading and MTU is dynamically configure and never get these on

Metric calculation

Real (Default) = 256*(BW + Delay)

BW = 10 ^ 7 BW

Delay = Delay in Microseconds

[Asif Javed]

Nice post buddy

share some about BGP