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Lab 5: DMVPN - BGP

The document discusses configuring BGP over a DMVPN network. It describes setting up the DMVPN tunnels between routers, enabling BGP peering between the routers over the tunnels, and verifying operation by checking the BGP and tunnel status.

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Devdutt Vishwakarma
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202 views9 pages

Lab 5: DMVPN - BGP

The document discusses configuring BGP over a DMVPN network. It describes setting up the DMVPN tunnels between routers, enabling BGP peering between the routers over the tunnels, and verifying operation by checking the BGP and tunnel status.

Uploaded by

Devdutt Vishwakarma
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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LAB 5: DMVPN – BGP

LAB 5: Diagram

Note: This Lab was developed on Cisco IOS Version15.2(4) M1 ADVENTERPRISEK9-M.


LAB 5: Configure BGP over DMVPN Configuration
Step 1: Enable loopback and physical interfaces on R1, R2, R3, R4 and R5.

R1:
interface FastEthernet0/0
ip address 172.16.1.2 255.255.255.252
no shutdown
exit

interface Loopback1
ip address 11.11.11.11 255.255.255.0
exit

R2:
interface FastEthernet1/0
ip address 172.16.2.2 255.255.255.252
no shutdown
exit

interface Loopback1
ip address 22.22.22.22 255.255.255.0
exit

R3:
interface FastEthernet2/0
ip address 172.16.3.2 255.255.255.252
no shutdown
exit

interface Loopback1
ip address 33.33.33.33 255.255.255.0
exit

R4:
interface FastEthernet3/0
ip address 172.16.4.2 255.255.255.252
no shutdown
exit
interface Loopback1
ip address 44.44.44.44 255.255.255.0
exit

R5:
interface FastEthernet0/0
ip address 172.16.1.1 255.255.255.252
no shutdown
exit

interface FastEthernet1/0
ip address 172.16.2.1 255.255.255.252
no shutdown
exit

interface FastEthernet2/0
ip address 172.16.3.1 255.255.255.252
no shutdown
exit

interface FastEthernet3/0
ip address 172.16.4.1 255.255.255.252
no shutdown
exit

Step 2: Assign default route pointing towards internet.

R1:
ip route 0.0.0.0 0.0.0.0 172.16.1.1

R2:
ip route 0.0.0.0 0.0.0.0 172.16.2.1

R3:
ip route 0.0.0.0 0.0.0.0 172.16.3.1

R4:
ip route 0.0.0.0 0.0.0.0 172.16.4.1

Step 3: Configure DMVPN

R1:
interface Tunnel 0
ip address 192.168.0.1 255.255.255.0 ! (Logical ip address)
ip nhrp map multicast dynamic ! (Enable multicast traffic)
ip nhrp network-id 5 ! (Assign same network-id else tunnel
will not form)
tunnel source 172.16.1.2 ! (Physical address of HUB interface)
tunnel mode gre multipoint ! (Select gre mode)
ip mtu 1400 ! (Change mtu for DMVPN header)
exit

R2:
interface Tunnel 0
ip address 192.168.0.2 255.255.255.0
ip nhrp network-id 5
tunnel source 172.16.2.2
ip nhrp map 192.168.0.1 172.16.1.2 !(Pointing towards NHS server)
ip nhrp map multicast 172.16.1.2 !(Allow multicast traffic from R2
(spoke) to R1(Hub))
ip nhrp nhs 192.168.0.1 !(Designates R1 as the NHS)
tunnel mode gre multipoint
ip mtu 1400
exit

R3:
interface Tunnel 0
ip address 192.168.0.3 255.255.255.0
ip nhrp network-id 5
tunnel source 172.16.3.2
ip nhrp map 192.168.0.1 172.16.1.2
ip nhrp map multicast 172.16.1.2
ip nhrp nhs 192.168.0.1
tunnel mode gre multipoint
ip mtu 1400
exit

R4:
interface Tunnel 0
ip address 192.168.0.4 255.255.255.0
ip nhrp network-id 5
tunnel source 172.16.4.2
ip nhrp map 192.168.0.1 172.16.1.2
ip nhrp map multicast 172.16.1.2
ip nhrp nhs 192.168.0.1
tunnel mode gre multipoint
ip mtu 1400
exit

Step 4: Configure BGP in routers.

R1:
router ospf 1
network 0.0.0.0 0.0.0.0 area 0
exit
int tunnel 0
ip ospf network broadcast
ip ospf priority 255
exit
router bgp 65000
neighbor 192.168.0.2 remote-as 65000
neighbor 192.168.0.2 soft-reconfiguration inbound
neighbor 192.168.0.3 remote-as 65000
neighbor 192.168.0.3 soft-reconfiguration inbound
neighbor 192.168.0.4 remote-as 65000
neighbor 192.168.0.4 soft-reconfiguration inbound
address-family ipv4
network 11.11.11.0 mask 255.255.255.0
exit

R2:
router ospf 1
network 0.0.0.0 0.0.0.0 area 0
exit
interface tunnel 0
ip ospf network broadcast
ip ospf priority 0
exit
router bgp 65000
neighbor 192.168.0.1 remote-as 65000
neighbor 192.168.0.1 soft-reconfiguration inbound
address-family ipv4
network 22.22.22.0 mask 255.255.255.0
exit

R3:
router ospf 1
network 0.0.0.0 0.0.0.0 area 0
exit
interface tunnel 0
ip ospf network broadcast
ip ospf priority 0
exit
router bgp 65000
neighbor 192.168.0.1 remote-as 65000
neighbor 192.168.0.1 soft-reconfiguration inbound
address-family ipv4
network 33.33.33.0 mask 255.255.255.0
exit

R4:
router ospf 1
network 0.0.0.0 0.0.0.0 area 0
exit
interface tunnel 0
ip ospf network broadcast
ip ospf priority 0
exit
router bgp 65000
neighbor 192.168.0.1 remote-as 65000
neighbor 192.168.0.1 soft-reconfiguration inbound
address-family ipv4
network 44.44.44.0 mask 255.255.255.0
exit

Step 6: BGP over DMVPN verification.

R1#show ip bgp
BGP table version is 9, local router ID is 11.11.11.11
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


*> 11.11.11.0/24 0.0.0.0 0 32768 i
*>i 22.22.22.0/24 192.168.0.2 0 100 0i
*>i 33.33.33.0/24 192.168.0.3 0 100 0i
*>i 44.44.44.0/24 192.168.0.4 0 100 0i
R2#show ip bgp
BGP table version is 5, local router ID is 22.22.22.22
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


*>i 11.11.11.0/24 192.168.0.1 0 100 0i
*> 22.22.22.0/24 0.0.0.0 0 32768 i

R3#show ip bgp
BGP table version is 5, local router ID is 33.33.33.33
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


*>i 11.11.11.0/24 192.168.0.1 0 100 0i
*> 33.33.33.0/24 0.0.0.0 0 32768 i

R4#show ip bgp
BGP table version is 5, local router ID is 44.44.44.44
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


*>i 11.11.11.0/24 192.168.0.1 0 100 0i
*> 44.44.44.0/24 0.0.0.0 0 32768 i

(Spilt Horizon doesn’t allow spoke to forward BGP routes to other spokes
because rule is routes received from one iBGP neighbor is not forwarded to
other iBGP neighbor.)

Step 7: Configure BGP route reflector.

R1:
router bgp 65000
neighbor 192.168.0.2 remote-as 1
neighbor 192.168.0.2 route-reflector-client
neighbor 192.168.0.4 remote-as 1
neighbor 192.168.0.4 route-reflector-client
exit
R1#show ip bgp

BGP table version is 8, local router ID is 11.11.11.11


Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? – incomplete

Network Next Hop Metric LocPrf Weight Path


*> 11.11.11.0/24 0.0.0.0 0 32768i
>i22.22.22.0/24 192.168.0.2 0 100 0 i
>i33.33.33.0/24 192.168.0.3 0 100 0 i
>i44.44.44.0/24 192.168.0.4 0 100 0 i

R2#show ip bgp

BGP table version is 14, local router ID is 22.22.22.22


Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? – incomplete

Network Next Hop Metric LocPrf Weight Path


>i11.11.11.0/24 192.168.0.1 0 100 0 i
*>22.22.22.0/24 0.0.0.0 0 32768i
>i33.33.33.0/24 192.168.0.3 0 100 0 i
>i44.44.44.0/24 192.168.0.4 0 100 0 i

R3#show ip bgp

BGP table version is 8, local router ID is 33.33.33.33


Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? – incomplete

Network Next Hop Metric LocPrf Weight Path


>i11.11.11.0/24 192.168.0.1 0 100 0 i
>i22.22.22.0/24 192.168.0.2 0 100 0 i
*>33.33.33.0/24 0.0.0.0 0 32768i
>i44.44.44.0/24 192.168.0.4 0 100 0 i

R4#show ip bgp

BGP table version is 14, local router ID is 44.44.44.44


Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? – incomplete

Network Next Hop Metric LocPrf Weight Path


>i11.11.11.0/24 192.168.0.1 0 100 0 i
>i22.22.22.0/24 192.168.0.2 0 100 0 i
>i33.33.33.0/24 192.168.0.3 0 100 0 i
*>44.44.44.0/24 0.0.0.0 0 32768i

Step 8 Verify DMVPN Tunnel creation.

R1#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
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
----- --------------- --------------- ----- -------- -----
1 172.16.2.2 192.168.0.2 UP 01:35:07 D
1 172.16.3.2 192.168.0.3 UP 01:35:01 D
1 172.16.4.2 192.168.0.4 UP 01:35:02 D

R2#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
UpDn Time --> Up or Down Time for a Tunnel
==============================================
========================
Interface: Tunnel0, IPv4 NHRP Details

Type:Spoke, NHRP Peers:3,


# Ent Peer NBMA Addr Peer Tunnel Add State UpDn Tm Attrb
----- --------------- --------------- ----- -------- -----
1 172.16.1.2 192.168.0.1 UP 00:55:53 S

R2#ping 192.168.0.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.0.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 196/261/340 ms

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