EIGRP

MACaddr

Terms to Remember

  • Feasible Distance (FD) — how far a network is from you, accumulative value
  • Advertised Distance (AD) — how far a network is from your neighbor
  • Successor — primary route stored in your ROUTING TABLE
  • Feasible Successor (FS) — BACKUP route stored in the topology table
    • note: Advertised route MUST be less than the Feasible Distance of the successor
  • Active Route (BAD) Route DOWN, EIGRP trying to find a backup
  • Passive Route (GOOD) EIGRP is running smoothly
  • Autonomous System (AS) — administrative control number from 1 – 65,535; example AS#90
  • Maximum Transmission Unit (MTU)

EIGRP Table

  1. Neighbor Table (NT)
  2. Topology Table (TT)
  3. Routing Table (RT)

All three tables are created every time EIGRP routing.

Metric / Formula


Commands

VERIFY
rt# show ip eigrp topology
rt# show ip eigrp interfaces

BASE COFNIG
rt# eigrp as# xxx  |-> e.q. rt# eigrp as 90

NEWORK COMMAND
rt# network x.x.x.x  wildcard bits x.x.x.x
   1. Hello
   2. Advertisement

Wildcard 0.0.0.0 |-> compare ALL 4 octet
Wildcard 0.0.0.255 |-> compare the first 2 octets
Wildcard 0.0.255.255 |-> compare the first 2 octets
Wildcard 0.255.255.255 |-> compare the first octet
Wildcard 255.255.255.255 |-> compare compare NOTHING

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