The first DMVPN lesson explained the basics and I explained how to configure a basic DMVPN phase 2 network. I also explain how to configure the EIGRP phase 1 network and OSPF Phase 1 network.
In this lesson, we’ll take a look at how we can use external BGP on DMVPN phase 2 networks and EIGRP. Here is the topology we will use:
R1(config)#interface serial 4/0
R1(config-if)#ip address 1.1.1.1 255.0.0.0
R1(config-if)#no shutdown
R1(config-if)#interface fastethernet 0/0
R1(config-if)#ip address 10.1.1.1 255.0.0.0
R1(config-if)#no shutdown
R1(config-if)#exit
R2(config)#interface serial 4/0
R2(config-if)#ip address 1.1.1.2 255.0.0.0
R2(config-if)#no shutdown
R2(config-if)#interface serial 4/1
R2(config-if)#ip address 3.3.3.1 255.0.0.0
R2(config-if)#no shutdown
R2(config-if)#interface serial 4/2
R2(config-if)#ip address 4.4.4.1 255.0.0.0
R2(config-if)#no shutdown
R2(config-if)#interface fastethernet 0/0
R2(config-if)#ip address 20.1.1.1 255.0.0.0
R2(config-if)#no shutdown
R2(config-if)#no keepalive
R2(config-if)#exit
R3(config)#interface serial 4/1
R3(config-if)#ip address 3.3.3.2 255.0.0.0
R3(config-if)#no shutdown
R3(config-if)#interface fastethernet 0/0
R3(config-if)#ip address 30.1.1.1 255.0.0.0
R3(config-if)#no shutdown
R3(config-if)#exit
R4(config)#interface serial 4/2
R4(config-if)#ip address 4.4.4.2 255.0.0.0
R4(config-if)#no shutdown
R4(config-if)#interface fastethernet 0/0
R4(config-if)#ip address 40.1.1.1 255.0.0.0
R4(config-if)#no shutdown
R4(config-if)#exit
R1(config)#ip route 0.0.0.0 0.0.0.0 serial 4/0
R1(config)#exit
R2(config)#ip route 1.0.0.0 255.0.0.0 serial 4/0
R2(config)#ip route 10.0.0.0 255.0.0.0 serial 4/0
R2(config)#ip route 30.0.0.0 255.0.0.0 serial 4/1
R2(config)#ip route 3.0.0.0 255.0.0.0 serial 4/1
R2(config)#ip route 4.0.0.0 255.0.0.0 serial 4/2
R2(config)#ip route 40.0.0.0 255.0.0.0 serial 4/2
R3(config)#ip route 0.0.0.0 0.0.0.0 serial 4/1
R3(config)#exit
R4(config)#ip route 0.0.0.0 0.0.0.0 serial 4/2
R4(config)#exit
R1#ping 40.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 40.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 24/45/88 ms
R1#ping 30.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 30.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/37/40 ms
R1#ping 20.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 20.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/20/36 ms
R1(config)#interface tunnel 4321
R1(config-if)#ip address 192.168.1.1 255.255.255.0
R1(config-if)#tunnel source 1.1.1.1
R1(config-if)#tunnel mode gre multipoint
*May 27 12:15:21.279: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel4321, changed state to up
R1(config-if)#exit
R3(config)#interface tunnel 4321
R3(config-if)#ip address 192.168.1.2 255.255.255.0
R3(config-if)#tunnel source 3.3.3.2
R3(config-if)#tunnel mode gre multipoint
*May 27 12:19:21.451: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel4321, changed state to up
R3(config-if)#ip nhrp network-id 3
R3(config-if)# ip nhrp map 192.168.1.1 1.1.1.1
R3(config-if)#ip nhrp nhs 192.168.1.1
R3(config)#end
R4(config)#interface tunnel 4321
R4(config-if)#ip address 192.168.1.3 255.255.255.0
R4(config-if)#tunnel source 4.4.4.2
R4(config-if)#tunnel mode gre multipoint
*May 27 12:27:05.091: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel4321, changed state to up
R4(config-if)#ip nhrp network-id 4
R4(config-if)#ip nhrp map 192.168.1.1 1.1.1.1
R4(config-if)#ip nhrp nhs 192.168.1.1
R4(config-if)#exit
R4(config)#end
R1(config)#router eigrp 4321
R1(config-router)#network 192.168.1.0
R1(config-router)#network 10.0.0.0
R1(config-router)#no auto-summary
R1(config-router)#exit
R3(config)#router eigrp 4321
R3(config-router)#network 192.168.1.0
R3(config-router)#network 10.0.0.0
R3(config-router)#no auto-summary
R3(config-router)#exit
R4(config)#router eigrp 4321
R4(config-router)#network 192.168.1.0
R4(config-router)#network 40.0.0.0
R4(config-router)#no auto-summary
R4(config-router)#exit
R1(config)#interface tunnel 4321
R1(config-if)#ip nhrp map multicast dynamic
R1(config-if)#exit
R1(config)#interface tunnel 4321
R1(config-if)#no ip split-horizon eigrp 4321
R1(config-if)#exit
R1(config)#interface tunnel 4321
R1(config-if)#no ip next-hop-self eigrp 4321
*May 27 12:51:44.351: %DUAL-5-NBRCHANGE: EIGRP-IPv4 4321: Neighbor 192.168.1.2 (Tunnel4321) is up: new adjacency
*May 27 12:52:53.611: %DUAL-5-NBRCHANGE: EIGRP-IPv4 4321: Neighbor 192.168.1.3 (Tunnel4321) is up: new adjacency
R1(config-if)#end
R3(config)#interface tunnel 4321
R3(config-if)#ip nhrp map multicast 1.1.1.1
R3(config-if)#ip nhrp map multicast 4.4.4.2
*May 27 12:52:05.019: %DUAL-5-NBRCHANGE: EIGRP-IPv4 4321: Neighbor 192.168.1.3 (Tunnel4321) is up: new adjacency
R3(config-if)#end
R4(config)#interface tunnel 4321
R4(config-if)#ip nhrp map multicast 3.3.3.2
R4(config-if)#ip nhrp map multicast 1.1.1.1
R4(config-if)#exit
{( if you get any error msg please shutdown physical interfaces and tunnel interface and restart the interfaces) Command SHUTDOWN and NO SHUTDOWN}
R4#show 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: Tunnel4321, IPv4 NHRP Details
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 00:15:50 S
1 3.3.3.2 192.168.1.2 UP 00:15:30 D
R4#show IP NHRP
192.168.1.1/32 via 192.168.1.1
Tunnel4321 created 00:16:09, never expire
Type: static, Flags: used
NBMA address: 1.1.1.1
192.168.1.2/32 via 192.168.1.2
Tunnel4321 created 00:15:41, expire 01:44:18
Type: dynamic, Flags: router used
NBMA address: 3.3.3.2
192.168.1.3/32 via 192.168.1.3
Tunnel4321 created 00:15:41, expire 01:44:18
Type: dynamic, Flags: router unique local
NBMA address: 4.4.4.2
(no-socket)
R4(config-if)#do show ip route eigrp
Gateway of last resort is 0.0.0.0 to network 0.0.0.0
D 10.0.0.0/8 [90/26882560] via 192.168.1.1, 00:00:54, Tunnel4321
D 30.0.0.0/8 [90/26882560] via 192.168.1.2, 00:00:32, Tunnel4321
R4(config-if)#end
R4#ping 10.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/40/44 ms
R4#ping 30.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 30.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/21/40 ms
R4#traceroute 10.1.1.1
Type escape sequence to abort.
Tracing the route to 10.1.1.1
VRF info: (vrf in name/id, vrf out name/id)
1 192.168.1.1 56 msec 64 msec 20 msec
R4#traceroute 30.1.1.1
Type escape sequence to abort.
Tracing the route to 30.1.1.1
VRF info: (vrf in name/id, vrf out name/id)
1 192.168.1.2 20 msec 36 msec 32 msec
R1#traceroute 30.1.1.1
Type escape sequence to abort.
Tracing the route to 30.1.1.1
VRF info: (vrf in name/id, vrf out name/id)
1 192.168.1.2 20 msec 48 msec 28 msec
R1#traceroute 40.1.1.1
Type escape sequence to abort.
Tracing the route to 40.1.1.1
VRF info: (vrf in name/id, vrf out name/id)
1 192.168.1.3 20 msec 24 msec 44 msec
R3#show 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: Tunnel4321, IPv4 NHRP Details
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 00:09:29 S
1 4.4.4.2 192.168.1.3 UP 00:00:58 D
R3#traceroute 10.1.1.1
Type escape sequence to abort.
Tracing the route to 10.1.1.1
VRF info: (vrf in name/id, vrf out name/id)
1 192.168.1.1 16 msec 36 msec 16 msec
R3#traceroute 40.1.1.1
Type escape sequence to abort.
Tracing the route to 40.1.1.1
VRF info: (vrf in name/id, vrf out name/id)
1 192.168.1.3 12 msec 48 msec 40 msec
now modify our current lab with EBGP. Remove EIGRP and configure EBGP.
Topology :-
R1(config)#no router eigrp 4321
R1(config)#do show ip pro
*** IP Routing is NSF aware ***
R3(config)#no router eigrp 4321
R4(config)#no router eigrp 4321
*May 27 13:24:43.167: %DUAL-5-NBRCHANGE: EIGRP-IPv4 4321: Neighbor 192.168.1.1 (Tunnel4321) is down: Interface PEER-TERMINATION received
*May 27 13:25:19.707: %DUAL-5-NBRCHANGE: EIGRP-IPv4 4321: Neighbor 192.168.1.2 (Tunnel4321) is down: Interface PEER-TERMINATION received
R1(config)#router bgp 1234
R1(config-router)#neighbor 192.168.1.2 remote-as 3421
R1(config-router)#neighbor 192.168.1.3 remote-as 4321
R1(config-router)#network 10.0.0.0 mask 255.0.0.0
R1(config-router)#exit
R3(config)#router bgp 3421
R3(config-router)#neighbor 192.168.1.1 remote-as 1234
*May 27 13:40:11.415: %BGP-5-ADJCHANGE: neighbor 192.168.1.1 Up
R3(config-router)#neighbor 192.168.1.3 remote-as 4321
R3(config-router)#network 30.0.0.0 mask 255.0.0.0
R3(config-router)#exit
R4(config)#router bgp 4321
R4(config-router)#neighbor 192.168.1.1 remote-as 1234
*May 27 13:41:37.855: %BGP-5-ADJCHANGE: neighbor 192.168.1.1 Up
R4(config-router)#neighbor 192.168.1.2 remote-as 3421
*May 27 13:41:57.815: %BGP-5-ADJCHANGE: neighbor 192.168.1.2 Up
R4(config-router)#network 40.0.0.0 mask 255.0.0.0
R4(config-router)#exit
R4(config)#end
R1#show bgp
BGP table version is 4, local router ID is 192.168.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 10.0.0.0 0.0.0.0 0 32768 i
* 30.0.0.0 192.168.1.2 0 4321 3421 i
*> 192.168.1.2 0 0 3421 i
* 40.0.0.0 192.168.1.3 0 3421 4321 i
*> 192.168.1.3 0 0 4321 i
R1#show ip bgp summary
BGP router identifier 192.168.1.1, local AS number 1234
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
192.168.1.2 4 3421 8 9 4 0 0 00:03:45 2
192.168.1.3 4 4321 7 10 4 0 0 00:01:59 2
R3#show bgp
BGP table version is 4, local router ID is 192.168.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
* 10.0.0.0 192.168.1.1 0 4321 1234 i
*> 192.168.1.1 0 0 1234 i
*> 30.0.0.0 0.0.0.0 0 32768 i
* 40.0.0.0 192.168.1.3 0 1234 4321 i
*> 192.168.1.3 0 0 4321 i
R3#show ip bgp summary
BGP router identifier 192.168.1.2, local AS number 3421
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
192.168.1.1 4 1234 8 8 4 0 0 00:03:32 2
192.168.1.3 4 4321 10 9 4 0 0 00:01:25 2
R4#show bgp
BGP table version is 5, local router ID is 192.168.1.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
* 10.0.0.0 192.168.1.1 0 3421 1234 i
*> 192.168.1.1 0 0 1234 i
*> 30.0.0.0 192.168.1.2 0 0 3421 i
* 192.168.1.2 0 1234 3421 i
*> 40.0.0.0 0.0.0.0 0 32768 i
R4#show ip bgp summary
BGP router identifier 192.168.1.3, local AS number 4321
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
192.168.1.1 4 1234 9 6 5 0 0 00:01:24 2
192.168.1.2 4 3421 9 10 5 0 0 00:01:04 2
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