Router eigrp

[Translator]

Hello.

You can suggest why EIGRP route 1 shows 192.168.27.0/24 instead of 192.168.27.0/26

Since I need to raise another VSN that consists of the 192.168.27.64/26 network, it does not work out, the route does not follow the scheme.

Sapasibo.

interface Vlan3
ip address 192.168.27.1 255.255.255.192
ip tcp adjust-mss 1452
!
router eigrp 1
passive-interface FastEthernet0
passive-interface FastEthernet1
network 192.168.1.20 0.0.0.3
network 192.168.2.20 0.0.0.3
network 192.168.27.1 0.0.0.0
auto-summary
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 192.168.1.22 track 1
ip route 0.0.0.0 0.0.0.0 192.168.2.22 10

Isfara#sh ip rou
Isfara#sh ip route ei
Isfara#sh ip route eigrp
D 192.168.29.0/24 [90/28162560] via 192.168.2.22, 00:10:25, Tunnel1
[90/28162560] via 192.168.1.22, 00:10:25, Tunnel0
D 192.168.45.0/24 [90/28162560] via 192.168.2.22, 00:10:25, Tunnel1
[90/28162560] via 192.168.1.22, 00:10:25, Tunnel0
D 192.168.25.0/24 [90/28162560] via 192.168.2.22, 00:10:25, Tunnel1
[90/28162560] via 192.168.1.22, 00:10:25, Tunnel0
192.168.27.0/24 is variably subnetted, 2 subnets, 2 masks
D 192.168.27.0/24 is a summary, 00:10:28, Null0

[Flavio Miranda]

Hi

 The wildcard mask for /26 is 0.0.0.63 . You can find those values here:

https://en.wikipedia.org/wiki/Wildcard_mask 

[MHM Cisco World]

auto-summary <- this way you need no auto-summary to make EIGRP use subnet prefix

[Richard Burts]

@MHM Cisco World is correct that the configuration of EIGRP includes the parameter auto-summary. This tells EIGRP that when it has a local subnet which is smaller than the classful subnet address (/26 for the local subnet where the classful address is /24) that EIGRP should generate a summary address of the classful network. And the output of show ip route eigrp confirms that this is the case

192.168.27.0/24 is variably subnetted, 2 subnets, 2 masks
D 192.168.27.0/24 is a summary, 00:10:28, Null0

The original post seems to indicate that there is some problem "Since I need to raise another VSN that consists of the 192.168.27.64/26 network, it does not work out, the route does not follow the scheme." 

The existing subnet is 192.168.27.0. Configuring another interface and using 192.168.27.65 should work. What is the issue? If you want 192.168.27.65 to be on some other device then this would be a problem. And in that case using no auto-summary would be the solution.