Hi,
I have an interesting issue with a DMVPN configuration I'm working on. The hub site is a 2851 running 12.4(10b) and the remote is an 871 running 12.4(11)XW3. In my tunnel configuration on the remote site - if I specify tunnel destination x.x.x.x, instead of using tunnel mode gre multipoint - Everything works. NHRP looks good and I receive EIGRP routes from the hub.
However - when I switch to tunnel mode gre multipoint - NHRP seems to be ok, but I can never establish an EIGRP peer relationship with the hub.
Below is my hub and remote tunnel config:
Hub:
interface Tunnel0
bandwidth 80000
ip address 10.254.0.1 255.255.255.0
no ip redirects
ip mtu 1400
no ip next-hop-self eigrp 101
ip nhrp authentication dmvpn1
ip nhrp map multicast dynamic
ip nhrp network-id 100099
ip nhrp holdtime 300
ip tcp adjust-mss 1360
no ip split-horizon eigrp 101
delay 1000
qos pre-classify
tunnel source GigabitEthernet0/1
tunnel mode gre multipoint
tunnel key XXXXXX
tunnel protection ipsec profile vpn-dmvpn
end
Remote Tunnel Config :
interface Tunnel0
bandwidth 1000
ip address 10.254.0.10 255.255.255.0
no ip redirects
ip mtu 1400
ip pim sparse-dense-mode
ip nhrp authentication dmvpn1
ip nhrp map multicast dynamic
ip nhrp map 10.254.0.1 a.b.c.d
ip nhrp map multicast 10.254.0.1
ip nhrp network-id 100099
ip nhrp holdtime 300
ip nhrp nhs 10.254.0.1
ip tcp adjust-mss 1360
delay 1000
qos pre-classify
tunnel source FastEthernet4
tunnel mode gre multipoint
tunnel key XXXXXX
tunnel protection ipsec profile vpn-dmvpn
end
In this scenario listed above nhrp appears good - however EIGRP never peers:
spoke01-871#sh dmvpn
Legend: Attrb --> S - Static, D - Dynamic, I - Incompletea
N - NATed, L - Local, X - No Socket
# Ent --> Number of NHRP entries with same NBMA peer
Tunnel0, Type:Spoke, NHRP Peers:1,
# Ent Peer NBMA Addr Peer Tunnel Add State UpDn Tm Attrb
----- --------------- --------------- ----- -------- -----
1 a.b.c.d 10.254.0.1 UP 00:05:41 S
EIGRP:
spoke01-871#sh ip eigrp nei det
IP-EIGRP neighbors for process 101
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 10.254.0.1 Tu0 14 00:00:47 1 5000 2 0
Version 12.4/1.2, Retrans: 10, Retries: 10, Waiting for Init, Waiting for Init Ack
UPDATE seq 1148 ser 0-0 Sent 47880 Init Sequenced
UPDATE seq 1149 ser 1-162 Sequenced
However - if I run these commands on the remote:
conf t
int tu0
no tunnel mode gre multipoint
tunnel dest a.b.c.d
POOF! EIGRP works:
spoke01-871#sh ip eigrp nei det
IP-EIGRP neighbors for process 101
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 10.254.0.1 Tu0 10 00:00:27 76 684 0 37
Version 12.4/1.2, Retrans: 1, Retries: 0, Prefixes: 79
Any ideas? Thanks!
Brad
