Monday, 29 April 2013

Verifying EIGRP

Verifying EIGRP




For my home network i will be verifying that my EIGRP configuration is working correctly. The is CHRONOS, is HADES, and is APHRODITE.

The EIGRP show commands will show very little detail as this network does not have redundant path ways. For a better view of how EIGRP works check my Basic EIGRP post.


With the show ip route eigrp command we can verify what routes have been learned via EIGRP.


We can see that it has learnt of all the networks being advertised from HADES and APHRODITE. We should configure a summary address (summarise the .2, .3, and .99) on APHRODITE to make the routing table smaller.

The show ip eigrp neighbors command will show some usful information. It will show the Hold time (18sec), its EIGRP neighbor (


The command show ip eigrp topology will show topology table which contains all the passive routes that have been learned and will show the FD and the AD to a remote network.


show ip protocols will show us information about the AS numbers, k values, and load balancing.

We can check to make sure EIGRP Hellos are being sent with show debug eigrp packets.



Verifying STP

Verifying STP




I will be verfiying that my Layer 3 switch (APHRODITE) is my root switch. To do this I will use a series of show comamnds.


We can see from the output below that this switch is indeed the root switch. I have manually lowered the Priority ID from the default value. You can also tell that this is the root switch as all ports are forwarding. 

The output also informs us that 802.1w is running on this switch. I have only shown information for VLAN 1, however the output for all the VLANs will be the same as I have made this switch root for all VLANs.


The command show spanning-tree summary will give us some useful information. It will confirm that this switch is the root switch for VLAN 1, 2, 3, and 99.




From the output below we can see the root switch is available through FA0/9. We can also see the the priority has been left at its default value.





The output below shows that all but one of the ports are in blocking mode. This switch has its ports in blocking mode as its MAC address is higher than GAIA's MAC address, which is the tie breaker as the priority values are the same.