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DMVPN tunnel phase 1 failure multiple spoke

So i have a existing and in production DMVPN provided via vpls from ISP 1 with 8 spokes. I have a new vpls circuit from ISP 2 that i and trying build tunnels for to migrate over to in the coming weeks. I am using the same transformation set from the existing tunnels. On ISP2 i can only ever get one hub to connect to the tunnel all other hubs continue to fail on phase one.

 

@ HUB

crypto isakmp policy 1
 authentication pre-share
!
crypto isakmp policy 10
crypto isakmp key Cisco123 address 0.0.0.0 0.0.0.0
!
!
crypto ipsec transform-set DMVPN esp-aes esp-md5-hmac
 mode transport
!
crypto ipsec profile DMVPN
 set security-association lifetime seconds 1800
 set transform-set DMVPN
 set pfs group2

interface Tunnel1
 bandwidth 1000
 ip address 10.254.254.1 255.255.255.0
 no ip redirects
 ip mtu 1400
 no ip next-hop-self eigrp 300
 ip flow ingress
 ip flow egress
 ip nhrp map multicast dynamic
 ip nhrp network-id 1
 ip nhrp holdtime 450
 ip tcp adjust-mss 1360
 no ip split-horizon eigrp 300
 delay 1000
 tunnel source GigabitEthernet0/2
 tunnel mode gre multipoint
 tunnel key 677067637
 tunnel protection ipsec profile DMVPN
 !
!
interface Tunnel2
 ip address 10.253.253.1 255.255.255.0
 no ip redirects
 ip mtu 1440
 no ip next-hop-self eigrp 300
 ip flow ingress
 ip flow egress
 ip nhrp map multicast dynamic
 ip nhrp network-id 2
 no ip split-horizon eigrp 300
 tunnel source GigabitEthernet0/1
 tunnel mode gre multipoint
 tunnel key 568749358
 tunnel protection ipsec profile DMVPN

 

interface GigabitEthernet0/0
 description Inside
 ip address 10.100.0.39 255.255.252.0
 duplex auto
 speed auto
 !
!
interface GigabitEthernet0/1
 description VPLS ISP 2
 ip address 10.100.25.2 255.255.255.252
 duplex auto
 speed auto

!
interface GigabitEthernet0/2
 description VPLS ISP1
 ip address 10.100.20.2 255.255.255.252
 duplex auto
 speed auto

 

IPv4 Crypto ISAKMP SA
dst             src             state          conn-id status
10.100.20.2     10.100.20.26    QM_IDLE           9004 ACTIVE
10.100.20.2     10.100.20.6     QM_IDLE           9006 ACTIVE
10.100.25.2     10.100.25.22    MM_SA_SETUP          0 ACTIVE
10.100.25.2     10.100.25.22    MM_NO_STATE          0 ACTIVE (deleted)
10.100.20.2     10.100.20.34    QM_IDLE           9002 ACTIVE
10.100.20.2     10.100.20.22    QM_IDLE           9009 ACTIVE
10.100.20.2     10.100.20.10    QM_IDLE           9001 ACTIVE
10.100.25.2     10.100.25.26    QM_IDLE           9005 ACTIVE
10.100.20.2     10.100.20.38    QM_IDLE           9008 ACTIVE
10.100.20.2     10.100.20.18    QM_IDLE           9007 ACTIVE
10.100.20.2     10.100.20.14    QM_IDLE           9003 ACTIVE
10.100.25.2     10.100.25.6     MM_SA_SETUP          0 ACTIVE
10.100.25.2     10.100.25.6     MM_NO_STATE          0 ACTIVE (deleted)

 

 

 

 

@ Spoke

 

crypto isakmp policy 1
 authentication pre-share
crypto isakmp key Cisco123 address 0.0.0.0 0.0.0.0
crypto isakmp invalid-spi-recovery
!
!
crypto ipsec transform-set DMVPN esp-aes esp-md5-hmac
 mode transport
!
crypto ipsec profile DMVPN
 set security-association lifetime seconds 1800
 set transform-set DMVPN
 set pfs group2
!
!
!
!
!
!
interface Tunnel2
 ip address 10.254.254.2 255.255.255.0
 no ip redirects
 ip hold-time eigrp 300 120
 ip nhrp map multicast 10.100.20.2
 ip nhrp map 10.254.254.1 10.100.20.2
 ip nhrp network-id 1
 ip nhrp nhs 10.254.254.1
 ip nhrp server-only
 tunnel source GigabitEthernet0/2
 tunnel mode gre multipoint
 tunnel key 677067637
 tunnel protection ipsec profile DMVPN
 !
!
interface Tunnel3
 ip address 10.253.253.2 255.255.255.0
 no ip redirects
 ip hold-time eigrp 300 120
 ip nhrp map 10.253.253.1 10.100.25.2
 ip nhrp map multicast 10.100.25.2
 ip nhrp network-id 2
 ip nhrp nhs 10.253.253.1
 ip nhrp server-only
 tunnel source GigabitEthernet0/1
 tunnel mode gre multipoint
 tunnel key 568749358
 tunnel protection ipsec profile DMVPN
 !
!
interface GigabitEthernet0/1
 description VPLS ISP 2
 ip address 10.100.25.6 255.255.255.252
 duplex auto
 speed auto
 !
!
interface GigabitEthernet0/2
 description VPLS ISP1
 ip address 10.100.20.6 255.255.255.252
 duplex auto
 speed auto

 

I have reloaded my hub and every time i connect to a different spoke on the second tunnel but i can't ever get more than one to connect.

1 ACCEPTED SOLUTION

Accepted Solutions

I was able to get the tunnels up and working. As the isp was handing it off on layer 2 subnetting all of my interfaces on a /30 was giving me a lot of broadcast traffic on eigrp packets. I re schemed my outbound interfaces on single /24 and everything is up and up.

View solution in original post

5 REPLIES 5
O Bitar
Beginner

Hi Looking quickly through your config, I do not see full isakmp policy. I believe you still need to add that.
I would also advice to create a 2nd IPSEC profile on the tunnel interfaces, or sourcing the Ipsec profiles from the same interface Ioopback if possible) and use the Shared keyword against the tunnel interface.

Regards
Omar

I removed the tunnel protection to see if i could at least get the gre tunnel built and i still am only ever able to get one tunnel up at a time. It is odd.

Just to clarify, when you say 1 tunnel up do you mean 1 Spoke in a tunnel? Can you post the output of show dmvpn removing any private details

You have some EIGRP errors on the VPLS ISP2 interfaces:-

Sep 17 03:07:21.028: EIGRP-IPv4(300): Neighbor 10.100.25.6 not on common subnet for GigabitEthernet0/1
Sep 17 03:06:57.503: EIGRP-IPv4(300): Neighbor 10.100.25.2 not on common subnet for GigabitEthernet0/1

Is the underlaying routing working correctly? Can you confirm routing is in place and working between all routers

I was able to get the tunnels up and working. As the isp was handing it off on layer 2 subnetting all of my interfaces on a /30 was giving me a lot of broadcast traffic on eigrp packets. I re schemed my outbound interfaces on single /24 and everything is up and up.

View solution in original post

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