I am having problems with my L3SW (model 3560). My L3SW have EIGRP running on it. Now, we are interconnecting with a vendor who is also using a 3560. I have no control on the vendor's 3560 whatsoever. The only information I have is the vendor's L3SW IP address, which is 192.168.11.131.
To enable the interconnection, I configured a VLAN on my side (VLAN11) and assigned an IP address to it (192.168.11.250). I then configured the port on my L3SW to which we are interconnected this way:
switchport access vlan 11
After I have enabled the port, it took only 15 - 20 minutes before I lost connection to my switch. When I was able to get inside the switch and undo all the configurations and reload the switch, I found this error:
%DTP-5-DOMAINMISMATCH: Unable to perform trunk negotia
tion on port Gi0/6 because of VTP domain mismatch
It seems that the trunking was broken on my L3SW when I enabled the interconnection port. Please let me know of a better way to handle this.
Does the connection have to be in a vlan? You can just make gi0/21 a routed port by using the command "no switchport" and then assign the IP address directly to the physical interface and then add the network to the EIGRP process. BTW, any idea how the other site is configured?