SSM indentifies traffic by both source and group address. Since the host already knows the S and G, RP will not need again. In order to support SSM, IGMPv3 should be used for all hosts facing interface. However, there is mechanism to map IGMPv2 and IGMPv1 to IGMPv3. Since my receiver in this lab is windows XP, I will use IGMP mapping from v2 to v3. As usual you can download the original configuration at the end of this post.
SSM group multicast address is limited to the IP address range from 232.0.0.0 to 232.255.255.255 and so I will configure SSM source address in this lab to 232.0.0.1 and 232.0.0.2.
After starting the multicast stream, there are two multicast stream flow to R1.
enugadi@M7i# run show pim join logical-router r1 Instance: PIM.master Family: INET Group: 232.0.0.1 Source: 10.0.5.200 Flags: sparse,spt Upstream interface: fe-1/3/0.0 Group: 232.0.0.2 Source: 10.0.5.200 Flags: sparse,spt Upstream interface: fe-1/3/0.0 Group: 239.255.255.250 Source: * RP: None Flags: sparse,rptree,wildcard Upstream interface: unknown (no route) Instance: PIM.master Family: INET6 enugadi@M7i# run show multicast route logical-router r1 detail Family: INET Group: 232.0.0.1 Source: 10.0.5.200/32 Upstream interface: fe-1/3/0.0 Session description: Source specific multicast Statistics: 133 kBps, 98 pps, 250856 packets Next-hop ID: 0 Upstream protocol: PIM Group: 232.0.0.2 Source: 10.0.5.200/32 Upstream interface: fe-1/3/0.0 Session description: Source specific multicast Statistics: 78 kBps, 57 pps, 195151 packets Next-hop ID: 0 Upstream protocol: PIM Family: INET6
Let’s send IGMP host messages from receiver and check (S,G join) on R5, R3, and R1.
R5:
Sep 23 00:00:39.774356 PIM ge-0/0/1.7 SENT 10.0.2.1 -> 224.0.0.13 V2 JoinPrune to 10.0.2.2 holdtime 210 groups 1 sum 0xd11f len 34 Sep 23 00:00:39.774455 group 232.0.0.1 joins 1 prunes 0 Sep 23 00:00:39.774552 join list: Sep 23 00:00:39.774602 source 10.0.5.200 flags sparse
R3:
Sep 23 00:00:39.794513 PIM ge-0/0/1.1 SENT 10.0.4.13 -> 224.0.0.13 V2 JoinPrune to 10.0.4.14 holdtime 210 groups 1 sum 0xcf13 len 34 Sep 23 00:00:39.794610 group 232.0.0.1 joins 1 prunes 0 Sep 23 00:00:39.794642 join list: Sep 23 00:00:39.794685 source 10.0.5.200 flags sparse
R1:
Sep 23 00:01:39.835709 PIM ge-0/0/0.1 RECV 10.0.4.13 -> 224.0.0.13 V2 JoinPrune to 10.0.4.14 holdtime 210 groups 1 sum 0xcf13 len 34 Sep 23 00:01:39.835832 group 232.0.0.1 joins 1 prunes 0 Sep 23 00:01:39.835866 join list: Sep 23 00:01:39.835907 source 10.0.5.200 flags sparse
Multicast receiver already receives multicast traffic from R1:
Let’s verify the multicast usages on R5, R3 and R1:
enugadi@M7i# run show multicast route logical-router r1 extensive Family: INET Group: 232.0.0.1 Source: 10.0.5.200/32 Upstream interface: fe-1/3/0.0 Downstream interface list: ge-0/0/0.1 Session description: Source specific multicast Statistics: 132 kBps, 97 pps, 279397 packets Next-hop ID: 262144 Upstream protocol: PIM Route state: Active Forwarding state: Forwarding Cache lifetime/timeout: 360 seconds Wrong incoming interface notifications: 0 Group: 232.0.0.2 Source: 10.0.5.200/32 Upstream interface: fe-1/3/0.0 Session description: Source specific multicast Statistics: 85 kBps, 63 pps, 223572 packets Next-hop ID: 0 Upstream protocol: PIM Route state: Active Forwarding state: Pruned Cache lifetime/timeout: 360 seconds Wrong incoming interface notifications: 0 Family: INET6 [edit] enugadi@M7i# run show multicast route logical-router r3 extensive Family: INET Group: 232.0.0.1 Source: 10.0.5.200/32 Upstream interface: ge-0/0/1.1 Downstream interface list: ge-0/0/0.7 Session description: Source specific multicast Statistics: 155 kBps, 114 pps, 20163 packets Next-hop ID: 262143 Upstream protocol: PIM Route state: Active Forwarding state: Forwarding Cache lifetime/timeout: 360 seconds Wrong incoming interface notifications: 0 Family: INET6 [edit] enugadi@M7i# run show multicast route logical-router r5 extensive Family: INET Group: 232.0.0.1 Source: 10.0.5.200/32 Upstream interface: ge-0/0/1.7 Downstream interface list: fe-1/3/1.0 Session description: Source specific multicast Statistics: 138 kBps, 102 pps, 20675 packets Next-hop ID: 262142 Upstream protocol: PIM Route state: Active Forwarding state: Forwarding Cache lifetime/timeout: 360 seconds Wrong incoming interface notifications: 0 Family: INET6
So multicast work as expected.
Below is the SSM mapping configuration on R5:
enugadi@M7i# show logical-routers r5 policy-options policy-statement ssm-policy
term 1 {
from {
route-filter 232.0.0.1/32 exact;
route-filter 232.0.0.2/32 exact;
}
then accept;
}
[edit]
enugadi@M7i# show logical-routers r5 routing-options
autonomous-system 65412;
multicast {
ssm-map ssm-mapping {
policy ssm-policy;
source 10.0.5.200;
}
}
[edit]
enugadi@M7i# show logical-routers r5 protocols igmp
traceoptions {
file debug-igmp;
flag leave detail;
flag report detail;
flag query detail;
}
interface fe-1/3/1.0 {
ssm-map ssm-mapping;
}
.
