(ROUTE) 642-902

EIGRP
(Advanced Distant Vector Routing protocol"Hybrid")
(Dose not know about all links in area "unlike OSPF/ISIS")

Uses Three Table to function (Neighbour Topology & Routing)

Neighbour Table contains all current Neightbours and there current status

Router#show ip eigrp 1 neighbours
IP-EIGRP neighbors for process 1
H    Address                 Interface       Hold      Uptime        SRTT     RTO    Q          Seq
                                                                        (sec)             (ms)                   Cnt     Num
0    10.0.0.3                  Fa0/0            14         00:56:23     74          444      0            3
note: show ip eigrp 1 neighbours ( 1 is the AS ID and can change depending on config but must be the same between routers) 

KEY:
  • H is the order in which the neighbours were discovered
  • IP Address of neighbour
  • Interface on which the Hello was received
  • Hold Time in seconds
  • Up Time i.e. how long the neighbour has been up
  • Smooth Round Trip Time (SRTT) - the average time in milliseconds between the transmission of a packet to a neighbour and the receipt of an acknowledgement.
  • Retransmission Timeout (RTO) - if a multicast has failed, then a unicast is sent to that particular router, the RTO is the time in milliseconds that the router waits for an acknowledgement of that unicast.
  • Queue - shows the number of queued packets.
  • Sequence Number of the last EIGRP packet received.
Topology Table contains all learnt routes from both local interfaces and neighbours

Router#show ip eigrp 1 topology
IP-EIGRP Topology Table for AS(1)/ID(172.16.3.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,r - reply Status, s - sia Status

P 10.0.0.0/24, 1 successors, FD is 281600
        via Connected, FastEthernet0/0
P 192.168.0.0/24, 1 successors, FD is 409600
        via 10.0.0.2 (409600/128256), FastEthernet0/0
P 192.168.2.0/24, 1 successors, FD is 409600
        via 10.0.0.2 (409600/128256), FastEthernet0/0
P 172.16.1.0/24, 1 successors, FD is 128256
        via Connected, Loopback1
P 172.16.2.0/24, 1 successors, FD is 128256
        via Connected, Loopback2
P 172.16.3.0/24, 1 successors, FD is 128256
        via Connected, Loopback3





Metric
K Values (have to match between neighbours to Successfully form relationship)
you can find the routers K Values by running:
Router#show ip protocols
This command shows you allot more than just K values so will make a section for it.

Cisco only uses K1 & K2
Default Metric = 256*(K1 + K3).

Full Metric = 256*([K1*Bw + K2*Bw/(256-Load) + K3*Delay]*[K5/(Reliability + K4)]).


K1 = Bandwith = 10^7/Bandwith (Bandwith is the min of any link in a route)
K2 = Load
K3 = Delay = (Link A + Link B + Link C /10)
K4 = Reliabilaty
K5 = MTU
Subscribe to: Posts (Atom)