Character Characteristics Description
Default
Value
K1 Bandwidth
Smallest Bandwidth across
Source and Destination
1
K2 Load Interface Load 0
K3 Delay Combined Delay on all interfaces 1
K4 Reliability Outgoing interface keepalive stats 0
K5 MTU Smallest MTU of Interface 0
Key features
Advance Distance Vector protocol
Diffusing Update Algorithm (DUAL)
Open Standard
Administrative distance –
1 – Internal = 90 (Network Command)
2 – External = 170 (Redistribution)
3 – Summary = 5 (Route Summarization)
Composite Metric
Protocol Number = 88
MD5 Authentication
VLSM Support
Route Summarization
Very fast Convergence
Hello & Hold Timers = 5/60 &15/180
Tables
Dual Terms
Feasible
Distance (FD)
Metric on local router to destination
Reported
Distance (RD)
Metric on neighbour to the destination
Successor Lowest FD to the destination
Feasible
Successor
2
nd
best to destination if feasibility condition is
met
Feasibility
Condition
Is met if RD to a network learned from neighbour
is less than local routers FD.
Status & Troubleshooting
show ip eigrp interfaces
show ip eigrp neighbors
show ip eigrp topology
debug ip eigrp
debug ip eigrp packet
debug ip eigrp neighbors
Stub Options
Connected
Advertise connected routes matching network
command
Summary Advertise summary Routes
Redistributed Advertise redistributed routes
Receive-Only No Routes are advertised
Static
Advertise static routes used with “redistribute
static” command
Route/Interface States
Passive Route is reachable
Active Unreachable, no FS exists
SIA
(Stuck in
Active)
The condition when a route becomes
unreachable and queries are not
answered
Passive
Interface
interface which does not participate in
EIGRP but whose network is
advertised
Packet Types
Hello Neighbor discover , use multicast and unreliable
ACK Always unicast & use unreliable delivery.
Update
Convey route info. can be unicast or multicast and
reliable
Query/Reply
Can be unicast or multicast and reliable
Request Multicast or Unicast and unreliable
Basic Configuration commands
Router eigrp <AS No>
Network <network > <Wildcard mask>
no auto-summary
neighbor x.x.x.x
clear ip eigrp x.x.x.x
IP summary-address <network> <subnet mask>
