EIGRP Tables Types

eigrp-table-types-ipcisco

EIGRP Tables

As we talked about a little before, EIGRP (Enhanced Interior Gateway Routing Protocol) has three different tables.

These EIGRP tables are:

• Neighbour Table
• Topology Table
• Routing Table

EIGRP Table Types
 

EIGRP Table Types
EIGRP Neighbour Table keeps all the routers that EIGRP neighbourship is established with. EIGRP Neighbour Table is established by Hello messages.

EIGRP (Enhanced Interior Gateway Routing Protocol) has a specific Neighbour Table for each Layer 3 protocols. For example, if you are using both IPv4 and IPv6 protocols, you will have two different EIGRP Neighbour Tables.

You can see the EIGRP Neighbour Table with “show ip eigrp neighbors ” command.

In EIGRP Neighbour Table you can see the ip address of the neighbour, the port you access to the neighbour, the port’s uptime etc.

You can see an output of “show ip eigrp neighbors ” command is given below:

Router# show ip eigrp neighbors 
IP-EIGRP neighbors for process 100
H   Address         Interface      Hold Uptime    SRTT   RTO   Q   Seq
                                   (sec)          (ms)        Cnt  Num
0   10.0.0.2        Fa4/0          11   00:00:08  40     1000  0   12
1   20.0.0.2        Fa5/0          10   00:00:08  40     1000  0   11

EIGRP Topology Table keeps all the routes to all the destinations. It keeps all the Successor and Feasible Successor routes. We can say also, “it keeps the best routes and the alternatives”.

You can check EIGRP Topology Table with “show ip eigrp topology ” command.

An example output of “show ip eigrp topology” command is given below:

Router# show ip eigrp topology 
IP-EIGRP Topology Table for AS 100/ID(192.168.1.2)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - Reply status

P 10.0.0.0/24, 1 successors, FD is 28160
         via Connected, FastEthernet4/0
P 20.0.0.0/24, 1 successors, FD is 28160
         via Connected, FastEthernet5/0
P 30.0.0.0/24, 1 successors, FD is 30720
         via 10.0.0.2 (30720/28160), FastEthernet4/0
P 40.0.0.0/8, 1 successors, FD is 30720
         via 20.0.0.2 (30720/28160), FastEthernet5/0
P 192.168.1.0/24, 1 successors, FD is 28160
         via Connected, FastEthernet0/0
P 192.168.2.0/24, 1 successors, FD is 30720
         via 10.0.0.2 (30720/28160), FastEthernet4/0
P 192.168.3.0/24, 1 successors, FD is 30720
         via 20.0.0.2 (30720/28160), FastEthernet5/0
P 192.168.4.0/24, 1 successors, FD is 33280
         via 10.0.0.2 (33280/30720), FastEthernet4/0

In EIGRP Topology Table, there are some route states. These states are:

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Lesson tags: EIGRP, routing
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