CCNA Notes
CompTIA LX103
Cisco ICND1
Cisco ICND2
Cisco CCNP Route
Various
Labs
CompTIA LX103
Cisco ICND1
Cisco ICND2
Cisco CCNP Route
Various
Labs
This is an old revision of the document!
GRE tunnels, but dynamic, yanno?
Going to skip the explanation until I hit this part in the books, but until then - a refresher on quick Phase 2 configuration from a Hub/spoke topology with one HUB. And excuse the terrible diagram, I'll build a better one one I'm not pressed for time!
REFER TO THE ABOVE DIAGRAM AND NOTE THE CONFIGS BELOW!
interface Tunnel10 ip address 192.168.1.1 255.255.255.0 <-- Tun Addr no ip redirects ip nhrp network-id 1 <-- Activates NHRP tunnel source Loopback0 tunnel mode gre multipoint <-- Enable DMVPN end
interface Tunnel10 ip address 192.168.1.3 255.255.255.0 <-- Set IP for Tun INT no ip redirects ip nhrp map 192.168.1.1 1.1.1.1 <-- Map Phys/NBMA address for NHS aka How do I get to 192.168.1.1? ip nhrp network-id 3 <-- Useful for multi-hub environments. Details later... ip nhrp nhs 192.168.1.1 <-- Specify NHS for tunnel traffic to traverse. tunnel source Loopback0 tunnel mode gre multipoint <-- Enable Dynamic Multipoint VPN end
interface Tunnel10 ip address 192.168.1.5 255.255.255.0 no ip redirects ip nhrp map 192.168.1.1 1.1.1.1 ip nhrp network-id 5 ip nhrp nhs 192.168.1.1 tunnel source Loopback0 tunnel mode gre multipoint end
R3#traceroute 5.5.5.5 <-- Loop to Loop Type escape sequence to abort. Tracing the route to 5.5.5.5 VRF info: (vrf in name/id, vrf out name/id) 1 10.2.3.2 36 msec 52 msec 48 msec 2 10.1.2.1 52 msec 56 msec 48 msec 3 10.1.4.4 76 msec 72 msec 68 msec 4 10.4.5.5 72 msec 56 msec 76 msec Tracing the route to 192.168.1.5 <-- Tun to Tun VRF info: (vrf in name/id, vrf out name/id) 1 192.168.1.5 88 msec 76 msec 76 msec R3#sh dmvpn | b Type Type:Spoke, NHRP Peers:2, # Ent Peer NBMA Addr Peer Tunnel Add State UpDn Tm Attrb ----- --------------- --------------- ----- -------- ----- 1 1.1.1.1 192.168.1.1 UP 00:01:24 S 1 5.5.5.5 192.168.1.5 UP 00:01:23 D R3#sh ip nhrp 192.168.1.1/32 via 192.168.1.1 Tunnel10 created 00:05:46, never expire Type: static, Flags: used NBMA address: 1.1.1.1 192.168.1.5/32 via 192.168.1.5 Tunnel10 created 00:04:05, expire 01:56:06 Type: dynamic, Flags: router used NBMA address: 5.5.5.5