Lab 2: Intra-domain SSM
Learning Objectives:
 Enable intra-domain SSM between hosts Q and R.
 Verify R -> Q operation with packet dumps and router state inspection.
Step 1: Addressing
 Choose SSM address (232.x.y.z) and port for your pod.
Step 2: Router configuration
 Configure multicast routing, use the SSM default range (232.x.y.z) and PIM Sparse Mode on:
o Customer-D (FastEthernet0/1, FastEthernet1/0, and Serial0/0)
ip multicast-routing
ip pim ssm default
interface FastEthernet0/1
ip pim sparse-mode
interface FastEthernet1/0
ip pim sparse-mode
interface Serial0/0
ip pim sparse-mode
o Customer-E (FastEthernet0/1 and Serial0/0) routers.
ip multicast-routing
ip pim ssm default
interface FastEthernet0/1
ip pim sparse-mode
interface Serial0/0
ip pim sparse-mode
 Configure IGMP version 3:
o Customer D (FastEthernet0/1 FastEthernet1/0)
interface
ip igmp
interface
ip igmp
FastEthernet0/1
version 3
FastEthernet1/0
version 3
o Customer E (FastEthernet0/1)
interface FastEthernet0/1
ip igmp version 3
Step 3: Capture and decode IGMP packets on Host-Q
 Start up Wireshark on Host-Q to verify that the IGMP Group Membership Reports are being
sent when requested.
sudo wireshark
 Within Wireshark:
o Select the capture interface
o Create and IGMP capture filter
o Start packet capture
Revised 3/8/16
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 Launch SSM receiver program on Host-Q, requesting traffic from Host-R on a given group.
(This will cause Host-Q to generate IGMP Group Membership Reports)
./rtpqual <source>@<group> <port>
Step 4: Verify IGMP operation on the router
 On Customer-D, verify that the IGMP Group Membership is being seen on the client
interface(s).
show ip igmp groups
 On Customer-D and Customer-E verify RPF interface for Host-R.
show ip rpf <host-r address>
 On Customer-D, verify that the (S,G) state exists and has correct input interface, correct output
interface(s), and no incrementing traffic counters.
show ip mroute <group>
show ip mroute <group> count
Step 5: Start multicast source on Host-R and capture packets on Host-Q
 Start SSM source program on Host-R and configure stream.
iperf –u -c 232.x.y.z –p <port> –b 1 –i 5 –T 10 –t 1000
 Capture data stream packets on Host-R to verify that the traffic is being sourced properly.
wireshark
Capture -> Start -> OK
 On Customer-D, verify that the traffic counters are incrementing properly.
show ip mroute <group> count
 Verify (via packet capture) that traffic stream is being received by the SSM receiver on Host-Q.
o Remove the capture filter configured in step 3
o Restart the packet capture
Step 6: Stop SSM source and receiver programs on Host-Q and Host-R.
Revised 3/8/16
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