Differences

This shows you the differences between two versions of the page.

--- ccnp:dmvpn [2024/03/15 00:05]
114.119.145.194 old revision restored (2023/10/16 05:52)
+++ ccnp:dmvpn [2024/03/15 00:12] (current)
114.119.158.167 old revision restored (2018/03/13 01:11)
@@ Line 1: / Line 1: @@
 ===== DMVPN w/ GRE =====
-YEAP!
+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!
+{{:ccnp:dmvpn.png?600|}}
+REFER TO THE ABOVE DIAGRAM AND NOTE THE CONFIGS BELOW!
+==== CONFIGS ====
+=== R1 the HUB ===
+<code>
+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
+</code>
+=== R3 Spoke ===
+<code>
+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
+</code>
+=== R5 Spoke ===
+<code>
+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
+</code>
+==== Verification and Flow ====
+<code>
+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)
+10.2.3.2 36 msec 52 msec 48 msec
+10.1.2.1 52 msec 56 msec 48 msec
+10.1.4.4 76 msec 72 msec 68 msec
+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)
+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             192.168.1.1    UP 00:01:24     S
+5.5.5.5             192.168.1.5    UP 00:01:23     D
+R3#sh ip nhrp
+.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
+.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
+</code>

Abrer_Wiki

User Tools

Site Tools

Differences

Page Tools