HomeLabsLAB III ( DMVPN, MGRE, NHRP, EIGRP)
20/02/2018

LAB III ( DMVPN, MGRE, NHRP, EIGRP)

The Next Hop Resolution Protocol (NHRP) is an Address Resolution Protocol (ARP)-like protocol that dynamically maps a Non-Broadcast Multi-Access (NBMA) network. With NHRP, systems attached to an NBMA network can dynamically learn the NBMA (physical) address of the other systems that are part of that network, allowing these systems to directly communicate.

NHRP is a client and server protocol where the hub is the Next Hop Server (NHS) and the spokes are the Next Hop Clients (NHCs). The hub maintains an NHRP database of the public interface addresses of each spoke. Each spoke registers its real address when it boots and queries the NHRP database for real addresses of the destination spokes to build direct tunnels.

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nhrp/configuration/xe-16/nhrp-xe-16-book/config-nhrp.html

HUB (R1 ):

R1: 
interface FastEthernet0/0
 ip address 192.168.1.100 255.255.255.0
 duplex full

interface Tunnel0
 ip address 10.1.1.1 255.255.255.0  #TUNNEL CONFIG
 no ip redirects
 ip mtu 1416
 ip hold-time eigrp 1 35         #EIGRP CONFIG
 no ip next-hop-self eigrp 1     #EIGRP CONFIG
 no ip split-horizon eigrp 1     #EIGRP CONFIG
 ip nhrp map multicast dynamic   #NHRP CONFIG 
 ip nhrp network-id 1            #NHRP CONFIG 
 tunnel source 192.168.1.100     #TUNNEL CONFIG
 tunnel mode gre multipoint      #TUNNEL CONFIG
!
router eigrp 1
 network 10.0.0.0
 network 172.16.0.0
 network 192.168.0.0
!
ip route 0.0.0.0 0.0.0.0 192.168.1.1  #ROUTING TO R2-INTERNET


SPOKES (R3, R4, R5 )

interface FastEthernet0/0 
 ip address 192.168.11.2 255.255.255.0 
 duplex full 
!
interface Tunnel0
 ip address 10.1.1.2 255.255.255.0     #TUNNEL CONFIG
 no ip redirects
 ip mtu 1416
 ip hold-time eigrp 1 35               #EIGRP CONFIG 
 no ip next-hop-self eigrp 1           #EIGRP CONFIG
 no ip split-horizon eigrp 1           #EIGRP CONFIG 
 ip nhrp map 10.1.1.1 192.168.1.100    #NHRP CONFIG
 ip nhrp map multicast 192.168.1.100   #NHRP CONFIG 
 ip nhrp network-id 1                  #NHRP CONFIG   
 ip nhrp nhs 10.1.1.1                  #NHRP CONFIG 
 tunnel source 192.168.11.2            #TUNNEL CONFIG
 tunnel mode gre multipoint            #TUNNEL CONFIG
!

router eigrp 1
 network 10.0.0.0
 network 172.16.0.0
 network 192.168.0.0
!
ip route 0.0.0.0 0.0.0.0 192.168.11.1   #ROUTING TO R2-INTERNET

 

 

R1#sh ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 192.168.1.1 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 192.168.1.1
      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.1.1.0/24 is directly connected, Tunnel0
L        10.1.1.1/32 is directly connected, Tunnel0
      172.16.0.0/24 is subnetted, 3 subnets
D        172.16.11.0 [90/27008000] via 10.1.1.2, 00:11:07, Tunnel0
D        172.16.12.0 [90/27008000] via 10.1.1.3, 00:11:07, Tunnel0
D        172.16.13.0 [90/27008000] via 10.1.1.4, 00:11:07, Tunnel0
      192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.1.0/24 is directly connected, FastEthernet0/0
L        192.168.1.100/32 is directly connected, FastEthernet0/0

HUB DMVPN

R1#sh dmvpn
Legend: Attrb --> S - Static, D - Dynamic, I - Incomplete
        N - NATed, L - Local, X - No Socket
        # Ent --> Number of NHRP entries with same NBMA peer
        NHS Status: E --> Expecting Replies, R --> Responding, W --> Waiting
        UpDn Time --> Up or Down Time for a Tunnel
==========================================================================

Interface: Tunnel0, IPv4 NHRP Details
Type:Hub, NHRP Peers:3,

 # Ent  Peer NBMA Addr Peer Tunnel Add State  UpDn Tm Attrb
 ----- --------------- --------------- ----- -------- -----
     1 192.168.11.2           10.1.1.2    UP 00:22:30     D
     1 192.168.12.2           10.1.1.3    UP 00:21:40     D
     1 192.168.13.2           10.1.1.4    UP 00:21:25     D

DMVPN and Routing via EIGRP

R3#sh dmvpn
Legend: Attrb --> S - Static, D - Dynamic, I - Incomplete
        N - NATed, L - Local, X - No Socket
        # Ent --> Number of NHRP entries with same NBMA peer
        NHS Status: E --> Expecting Replies, R --> Responding, W --> Waiting
        UpDn Time --> Up or Down Time for a Tunnel
==========================================================================

Interface: Tunnel0, IPv4 NHRP Details
Type:Spoke, NHRP Peers:2,

 # Ent  Peer NBMA Addr Peer Tunnel Add State  UpDn Tm Attrb
 ----- --------------- --------------- ----- -------- -----
     1 192.168.1.100          10.1.1.1    UP 00:22:43     S
     1 192.168.12.2           10.1.1.3    UP 00:21:29     D

R3#ping 172.16.13.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.13.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/50/144 ms
R3#ping 172.16.12.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.12.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/30/36 ms

Purge from R3:

Purge reply:

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