Multicast/Broadcast conversion

August 23, 2008 at 3:25 pm | Posted in Multicast | Leave a comment

Lab12 Task 6.2

SW1 —–R1——-R3——-R2——SW2

SW1 is the multicast source. Segment btw R3 & R2 is broadcast only.

Doc CD Navigation

  • Cisco IOS IP Multicast Configuration Guide, Release 12.4
  • Configuring an Intermediate IP Multicast Helper Between Broadcast-Only Networks
  • Configuration Examples for an Intermediate IP Multicast Helper Between Broadcast-Only Networks
  • Configuring an Intermediate IP Multicast Helper Between Broadcast-Only Networks: Example

Configuration

R1#
ip multicast-routing

interface Serial0/1
ip address 129.1.13.1 255.255.255.0
ip pim dense-mode

interface FastEthernet0/0
ip address 129.1.17.1 255.255.255.0
ip pim dense-mode

R3#

ip multicast-routing

interface Serial1/0
ip address 129.1.13.3 255.255.255.0
ip pim dense-mode
ip multicast helper-map 225.25.25.25 129.1.23.255 125

interface Serial1/1
ip address 129.1.23.3 255.255.255.0
ip directed-broadcast

ip forward-protocol udp 31337
access-list 125 permit udp any any eq 31337

R2#

interface FastEthernet0/0
ip address 192.10.1.2 255.255.255.0
ip pim dense-mode

interface Serial0/1
ip address 129.1.23.2 255.255.255.0
ip pim dense-mode
ip multicast helper-map broadcast 225.25.25.25 125

ip forward-protocol udp 31337
access-list 125 permit udp any any eq 31337

Verification:

SW1#
ip sla 1
udp-echo 225.25.25.25 31337 source-ip 129.1.17.7 source-port 31337 control disable
timeout 1
frequency 5
ip sla schedule 1 start-time now

Rack1R1#sh ip mroute
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,
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
Outgoing interface flags: H – Hardware switched, A – Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 225.25.25.25), 00:27:02/stopped, RP 0.0.0.0, flags: D
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0/1, Forward/Dense, 00:27:02/00:00:00

(129.1.17.7, 225.25.25.25), 00:27:02/00:02:57, flags: T
Incoming interface: FastEthernet0/0, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0/1, Forward/Dense, 00:27:02/00:00:00

(*, 224.0.1.40), 01:00:19/00:02:25, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0/1, Forward/Dense, 00:59:36/00:00:00
FastEthernet0/0, Forward/Dense, 01:00:19/00:00:00

R1#
int fa0/0
no ip mroute-cache

Rack1R1#deb ip mpacket
IP multicast packets debugging is on
*Mar  1 03:40:20.887: IP(0): s=129.1.17.7 (FastEthernet0/0) d=225.25.25.25 (Serial0/1) id=0, ttl=254, prot=17, len=44(44), mforward
*Mar  1 03:40:25.887: IP(0): s=129.1.17.7 (FastEthernet0/0) d=225.25.25.25 (Serial0/1) id=0, ttl=254, prot=17, len=44(44), mforward

Rack1R3#sh ip mroute
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,
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
Outgoing interface flags: H – Hardware switched, A – Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 225.25.25.25), 00:51:15/stopped, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial1/0, Forward/Dense, 00:51:15/00:00:00

(129.1.17.7, 225.25.25.25), 00:28:30/00:02:59, flags: PLTX
Incoming interface: Serial1/0, RPF nbr 129.1.13.1
Outgoing interface list: Null

(*, 224.0.1.40), 01:01:03/stopped, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial1/0, Forward/Dense, 01:01:04/00:00:00

Rack1R2#debug ip mpacket
IP multicast packets debugging is on
Rack1R2#debug ip packet detail 125
IP packet debugging is on (detailed) for access list 125

*Mar  1 03:44:15.127: IP: s=129.1.17.7 (Serial0/1), d=255.255.255.255, len 44, rcvd 2
*Mar  1 03:44:15.127:     UDP src=31337, dst=31337
*Mar  1 03:44:15.127: IP(0): s=129.1.17.7 (Serial0/1) d=225.25.25.25 (FastEthernet0/0) id=0, ttl=252, prot=17, len=44(44), mforward
*Mar  1 03:44:20.127: IP: s=129.1.17.7 (Serial0/1), d=255.255.255.255, len 44, rcvd 2
*Mar  1 03:44:20.127:     UDP src=31337, dst=31337
*Mar  1 03:44:20.127: IP(0): s=129.1.17.7 (Serial0/1) d=225.25.25.25 (FastEthernet0/0) id=0, ttl=252, prot=17, len=44(44), mforward

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