DMVPN Phase 3 – Multicast with source and receiver on spokes

Assumption :

  • PIM open standard (rp-candidate + bsr-candidate), PIM SM
  • RP is connected behind the HUB. (10.15.15.15)
  • The source is connected to the Spoke 1.
  • The receiver is connected to the spoke 2

HUB configuration :

ip multicast-routing
!
interface Tunnel0
 bandwidth 1000
 ip address 10.0.1.1 255.255.255.248
 no ip redirects
 ip mtu 1400
 ip pim nbma-mode
 ip pim sparse-mode
 ip nhrp authentication key
 ip nhrp map multicast dynamic
 ip nhrp network-id 12345
 ip nhrp holdtime 300
 ip nhrp redirect
 ip tcp adjust-mss 1360
 delay 1000
 tunnel source Ethernet0/0
 tunnel mode gre multipoint
 tunnel protection ipsec profile PROFILE

Spoke 1 configuration :

ip multicast-routing
!
ip pim spt-threshold infinity
!
interface Tunnel0
 bandwidth 1000
 ip address 10.0.1.2 255.255.255.248
 no ip redirects
 ip mtu 1400
 ip pim sparse-mode
 ip nhrp authentication key
 ip nhrp map multicast 172.16.0.1
 ip nhrp map 10.0.1.1 172.16.0.1
 ip nhrp network-id 12345
 ip nhrp holdtime 300
 ip nhrp nhs 10.0.1.1 
 ip nhrp shortcut
 ip tcp adjust-mss 1360
 delay 1000
 tunnel source Serial1/0
 tunnel mode gre multipoint
 tunnel protection ipsec profile PROFILE

Spoke 2 configuration :

ip multicast-routing
!
ip pim spt-threshold infinity
!
interface Tunnel0
 bandwidth 1000
 ip address 10.0.1.3 255.255.255.248
 no ip redirects
 ip mtu 1400
 ip pim sparse-mode
 ip nhrp authentication key
 ip nhrp map multicast 172.16.0.1
 ip nhrp map 10.0.1.1 172.16.0.1
 ip nhrp network-id 12345
 ip nhrp holdtime 300
 ip nhrp nhs 10.0.1.1
 ip nhrp shortcut
 ip tcp adjust-mss 1380
 delay 1000
 tunnel source Serial1/0
 tunnel mode gre multipoint
 tunnel protection ipsec profile PROFILE

Tshoot

IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
 L - Local, P - Pruned, R - RP-bit set, F - Register flag,
 T - SPT-bit set, J - Join SPT, M - MSDP created entry, E - Extranet,
 X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
 U - URD, I - Received Source Specific Host Report,
 Z - Multicast Tunnel, z - MDT-data group sender,
 Y - Joined MDT-data group, y - Sending to MDT-data group,
 G - Received BGP C-Mroute, g - Sent BGP C-Mroute,
 Q - Received BGP S-A Route, q - Sent BGP S-A Route,
 V - RD & Vector, v - Vector
Outgoing interface flags: H - Hardware switched, A - Assert winner
 Timers: Uptime/Expires
 Interface state: Interface, Next-Hop or VCD, State/Mode

RP on HUB and Spokes routers

#sh ip pim rp
Group: 232.1.1.1, RP: 10.15.15.15, v2, uptime 00:13:52, expires 00:01:46
! Source multicast with real IP address 10.1.18.1

SPOKE1#sh ip mroute 232.1.1.1 

(*, 232.1.1.1), 00:02:40/stopped, RP 10.15.15.15, flags: SPF
 Incoming interface: Tunnel0, RPF nbr 10.0.1.1
 Outgoing interface list: Null

(10.1.18.1, 232.1.1.1), 00:02:40/00:03:23, flags: FT
 Incoming interface: Ethernet0/0, RPF nbr 0.0.0.0, Registering
 Outgoing interface list:
 Tunnel0, Forward/Sparse, 00:02:40/00:02:47, A
! Receiver multicast for the group 232.1.1.1

interface Ethernet0/0
 ip address 10.1.19.1 255.255.255.0
 ip pim sparse-mode
 ip igmp join-group 232.1.1.1

SPOKE2#sh ip mroute 232.1.1.1

(*, 232.1.1.1), 00:09:21/00:02:42, RP 10.15.15.15, flags: SCL
 Incoming interface: Tunnel0, RPF nbr 10.0.1.1
 Outgoing interface list:
 Ethernet0/0, Forward/Sparse, 00:09:19/00:02:42
HUB#sh ip mroute 232.1.1.1


(*, 232.1.1.1), 00:09:13/00:03:08, RP 10.15.15.15, flags: S
 Incoming interface: Ethernet0/1, RPF nbr 10.20.1.17
 Outgoing interface list:
 Tunnel0, 10.0.1.3, Forward/Sparse, 00:09:13/00:03:08

(10.1.18.1, 232.1.1.1), 00:06:17/00:01:35, flags: T
 Incoming interface: Tunnel0, RPF nbr 10.0.1.3
 Outgoing interface list:
 Tunnel0, 10.0.1.3, Forward/Sparse, 00:06:17/00:03:08
SPOKE2#mtrace 10.1.19.1 232.1.1.1
Type escape sequence to abort.
Mtrace from 10.1.19.1 to 10.1.19.1 via group 232.1.1.1
From source (?) to destination (?)
Querying full reverse path...
 0  10.1.19.1
-1  10.1.19.1 ==> 10.0.1.3 PIM  [using shared tree]       << Interface Tu0
-2 10.0.1.1 ==> 10.20.1.18 PIM  [using shared tree]       << Interface Tu0 Hub to next router 
-3 10.20.1.17 ==> 10.20.1.2 PIM  [using shared tree]      << Next router to RP router 
-4 10.20.1.1 ==> 0.0.0.0 PIM_MT Reached RP/Core [using shared tree] << RP router
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