ā10-26-2022 07:31 PM
Hello Team,
I have a single hub, two spokes DMVPN Phase 1 topology but I can't get connectivity between the spokes. Any help is appreciated. Thank you in advance. The attached file shows with the spokes routing tables that they can't reach each other but the tunnels between the spokes and the hub are up and running; at least from I can see. The configs are also in the attached file.
Solved! Go to Solution.
ā10-28-2022 11:32 AM
then only use eigrp number not eigrp named and check.
router eigrp GRE-OVERLAY ! address-family ipv4 unicast autonomous-system 100 ! topology base exit-af-topology network 10.1.1.0 0.0.0.255 network 192.168.100.0 exit-address-family
be
router eigrp 100 network 10.1.1.0 0.0.0.255 network 192.168.100.0 exit-address-family
ā10-28-2022 01:14 PM
@NBenat it worked because with named mode you specify all EIGRP configuration (including split horizon) under the router context, not on the tunnel interface. Example:
router eigrp EIGRP
!
address-family ipv4 unicast autonomous-system 5
!
af-interface <interface>
no split-horizon
.
ā10-27-2022 05:34 PM - edited ā10-27-2022 05:47 PM
Not sure how is your SP config looks like, is the only have a routing issue? or anything else ?
check below exact my lab looks the same : (hope that help to fix the issue)
ā10-27-2022 08:26 PM
ā10-27-2022 11:04 PM
ā10-27-2022 05:37 PM
Becuase phaseI dmvpn only supports hub-spoke
For spoke-spoke you need phaseII or phaseIII
ā10-27-2022 08:19 PM
ā10-28-2022 01:19 AM
ok,
you mention OSPF and I see EIGRP in your config, can you more elaborate ?
ā10-28-2022 09:12 AM
ā10-28-2022 09:35 AM
show ip route in hub and spoke
please share here
ā10-28-2022 10:30 AM
here are the show ip route outputs you requested.
R11 Hub Routing Table
R31 Spoke Routing Table
R41 Spoke Routing Table
ā10-28-2022 10:57 AM
no ip split-horizon eigrp 100
replace eigrp 100 with eigrp GRE-OVERLAY in above command
ā10-28-2022 11:12 AM
I tried it but it wouldn't take it; it wants the AS number as shown below. Thank you for trying though and I do appreciate the support. I really would like to know what the problem is.
ā10-28-2022 11:32 AM
then only use eigrp number not eigrp named and check.
router eigrp GRE-OVERLAY ! address-family ipv4 unicast autonomous-system 100 ! topology base exit-af-topology network 10.1.1.0 0.0.0.255 network 192.168.100.0 exit-address-family
be
router eigrp 100 network 10.1.1.0 0.0.0.255 network 192.168.100.0 exit-address-family
ā10-28-2022 01:05 PM - edited ā10-28-2022 01:23 PM
To be honest, I was reluctant to do it because it did take the "no split horizon" and the command was saved in the running config for the tunnel interface on the hub.
So, I replaced the EIGRP named configuration with the classic one as per your recommendation. I did it on all three routers. And it worked! I still don't understand why it fixes the problem, but at least it does. Thank you again,. If you have any idea why named EIGRP could be a problem, please share it. The screenshots below show that it is working and that the spokes can reach each other through the hub.
R31 Routing Table
R41 Routing Table
Spoke-Spoke (PC31 to PC 41)
Spoke-Spoke (PC41 to PC 31)
ā10-28-2022 11:41 AM
I see in each Spoke the Hub LAN subnet but not see other Spoke LAN subnet so split-horizon is issue here not eigrp nor the DMVPN, that what I think.
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