EIGRP (Associate to Professional level)

Routing & Switching EIGRP
11

Hi Rene/Laz,

Query related to EIGRP Summarization ::

  1. why are we getting different out while using summary-address and summary metric command for summarization ?
    R2#show ip route eigrp
    172.16.0.0/23 is subnetted, 1 subnets
    D 172.16.0.0 [90/30720] via 192.168.12.1, 00:00:53, FastEthernet0/0

R2#show ip route eigrp
172.16.0.0/24 is subnetted, 2 subnets
D 172.16.0.0 [90/2562816] via 192.168.12.1, 00:02:28, FastEthernet0/0
D 172.16.1.0 [90/2562816] via 192.168.12.1, 00:02:28, FastEthernet0/0

I think in both output there must be 172.16.0.0/23 subnetted, 1 subnets … and let’s suppose 172.16.0.0 subnetted in subnets in 2nd output but it should display 172.16.0.0/23 instead of 172.16.0.0/24 ?

  1. Could you fully explain concept of null 0 using topology and for which network ( from which router) ?