Friday, July 23, 2021

EIGRP Flapping over DMVPN

Hello, chat, I am currently having issues with DMVPN flapping over my DMVPN WAN infrastructure. I have been looking at my configurations for some time now and have not been able to identify any configurations errors that could be causing this issue. I wanted to upload to chat to see if anyone would help me figure out what is possible inconsistent or wrong in my configuration. Thanks!

Spoke Log Error: *Jul 23 18:16:11.972: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 172.27.250.2 (Tunnel500) is down: retry limit exceeded

--More--

*Jul 23 18:16:16.313: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 172.27.250.2 (Tunnel500) is up: new adjacency

SPOKE CONFIGURATION:

interface Tunnel500

description DMVPN

bandwidth 10000000

ip address 172.27.250.6 255.255.255.240

no ip redirects

ip mtu 1400

ip nhrp authentication DMVPN123

ip nhrp map 172.27.250.1 65.57.79.218

ip nhrp map multicast 65.57.79.218

ip nhrp map 172.27.250.2 4.17.253.242

ip nhrp network-id 10

ip nhrp nhs 172.27.250.1

ip nhrp nhs 172.27.250.2

ip tcp adjust-mss 1360

delay 1000

tunnel source GigabitEthernet0/0

tunnel mode gre multipoint

tunnel key 1

router eigrp DMVPN

!

address-family ipv4 unicast autonomous-system 100

!

topology base

exit-af-topology

network 172.27.250.0 0.0.0.15

exit-address-family

HUB CONFIGURATION:

interface Tunnel500

description DMVPN

bandwidth 1000000

ip address 172.27.250.1 255.255.255.240

no ip redirects

ip mtu 1400

ip nhrp authentication DMVPN123

ip nhrp network-id 10

no ip split-horizon

ip tcp adjust-mss 1360

delay 1000

tunnel source GigabitEthernet0/1

tunnel mode gre multipoint

tunnel key 1

router eigrp DMVPN

!

address-family ipv4 unicast autonomous-system 100

!

topology base

exit-af-topology

network 172.27.250.0 0.0.0.15

exit-address-family



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