EIGRP topology table

[eric.cote]

Can anyone help me uderstand why when specifiing a network to lookup in an EIGRP topology table router responds with--> "% Route not in topology table"

router>sh ip eigrp top 10.16.64.0

% Route not in topology table

But when specifiing with the include option, it reteives information?

router>sh ip eigrp top | include 10.16.64.0

P 10.16.64.0/19, 1 successors, FD is 20512000

P 10.16.64.0/24, 1 successors, FD is 20514560

This makes no sense to me, the information is in the topology table but the first command wont retrieve it?

[Faraz Shamim]

Eric,

This is due to the EIGRP default classful behaviour. The way this command works is that it first tries to find the classful match for a prefix. If there is no match then it will spit the above message : % Route not in topology table

So in your above example if you had 10.0.0.0/8 in the topology you would have definitely seen some output when you type the comand show ip eigrp topology 10.0.0.0.

In todays classless world you should always type this command with the specific mask. In other words if you type show ip eigrp topology 10.16.64.0 255.255.255.0 then you will see that it will show the details about 10.16.64.0/24 from the topology table. Similarly show ip eigrp topology 10.16.64.0 255.255.224.0 will show the topology details of 10.16.64.0/19.

Hope it helps,

Faraz