BigIron RX Series Configuration Guide
1057
53-1001810-01
PIM SM traffic snooping
41
Notice that the receiver for group 239.255.162.69 is directly connected to the device. As result,
the device does not see a join message on behalf of the client. However, since IP multicast traffic
reduction also is enabled, the device uses the IGMP group membership report from the client to
select the port for forwarding traffic to group 239.255.162.69 receivers.
The IP multicast traffic reduction feature and the PIM SM traffic snooping feature together build a
list of groups and forwarding ports for the VLAN. The list includes PIM SM groups learned through
join messages as well as MAC addresses learned through IGMP group membership reports. In this
case, even though the device never sees a join message for the receiver for group
239.255.162.69, the device nonetheless learns about the receiver and forwards group traffic to
the receiver.
The device stops forwarding IP multicast traffic on a port for a group if the port receives a prune
message for the group.
Notice that the ports connected to the source and the receivers are all in the same port-based
VLAN on the device. This is required for the PIM SM snooping feature. The feature also requires the
source and the downstream router to be on different IP subnets, as shown in
Figure 136
.
Figure 137
shows another example application for PIM SM traffic snooping. This example shows
devices on the edge of a Global Ethernet cloud (a Layer 2 Packet over SONET cloud). Assume that
each device is attached to numerous other devices such as other
BigIron RX
.
FIGURE 137
PIM SM traffic reduction in global Ethernet environment
The devices on the edge of the Global Ethernet cloud are configured for IP multicast traffic
reduction and PIM SM traffic snooping. Although this application uses multiple devices, the
feature has the same requirements and works the same way as it does on a single device.
Switch A
Switch B
Switch C
VLAN 2
Port5/1
VLAN 2
Port7/1
VLAN 2
Port1/1
VLAN 2
Port5/1
VLAN 2
Port1/1
VLAN 2
Port1/1
VLAN 2
Port5/1
Receiver for Group
239.255.162.69
Client sends an
IGMP group
membership report
for 239.255.162.69.
Receiver for Group
239.255.162.1
Router sends a
PIM SM join message
for 239.255.162.1.
Router
Client
Client
Router
Client
10.10.10.5
The switches “snoop” for PIM SM
join and prune messages.
Switch A detects a source on port1/1
and a receiver for that source’s group
on port5/1. The switch forwards
multicast data from the source on port1/1
out port5/1 only, which has the receiver.
Without PIM SM traffic snooping, the
switch would forward traffic from the
source out all other ports.
20.20.20.5
Source for Groups
239.255.162.1
239.255.162.69
Summary of Contents for Brocade DCX
Page 40: ...xl BigIron RX Series Configuration Guide 53 1001810 01 ...
Page 72: ...lxxii BigIron RX Series Configuration Guide 53 1001810 01 ...
Page 88: ...16 BigIron RX Series Configuration Guide 53 1001810 01 Searching and filtering output 1 ...
Page 300: ...228 BigIron RX Series Configuration Guide 53 1001810 01 Displaying IP information 7 ...
Page 318: ...246 BigIron RX Series Configuration Guide 53 1001810 01 Deploying a LAG 8 ...
Page 418: ...346 BigIron RX Series Configuration Guide 53 1001810 01 SuperSpan 12 ...
Page 482: ...410 BigIron RX Series Configuration Guide 53 1001810 01 MRP CLI example 14 ...
Page 506: ...434 BigIron RX Series Configuration Guide 53 1001810 01 Displaying VSRP information 15 ...
Page 582: ...510 BigIron RX Series Configuration Guide 53 1001810 01 Viewing Layer 2 ACLs 20 ...
Page 634: ...562 BigIron RX Series Configuration Guide 53 1001810 01 Troubleshooting ACLs 21 ...
Page 642: ...570 BigIron RX Series Configuration Guide 53 1001810 01 Trunk formation 22 ...
Page 746: ...674 BigIron RX Series Configuration Guide 53 1001810 01 Displaying RIP filters 24 ...
Page 808: ...736 BigIron RX Series Configuration Guide 53 1001810 01 Displaying OSPF information 25 ...
Page 938: ...866 BigIron RX Series Configuration Guide 53 1001810 01 Displaying MBGP information 27 ...
Page 950: ...878 BigIron RX Series Configuration Guide 53 1001810 01 Using secure copy 28 ...
Page 988: ...916 BigIron RX Series Configuration Guide 53 1001810 01 Clearing IS IS information 29 ...
Page 1054: ...982 BigIron RX Series Configuration Guide 53 1001810 01 Sample 802 1x configurations 33 ...
Page 1108: ...1036 BigIron RX Series Configuration Guide 53 1001810 01 sFlow 39 ...
Page 1190: ...1118 BigIron RX Series Configuration Guide 53 1001810 01 Displaying RIPng information 44 ...
Page 1270: ...1198 BigIron RX Series Configuration Guide 53 1001810 01 Displaying ACLs 47 ...
Page 1310: ...1238 BigIron RX Series Configuration Guide 53 1001810 01 Displaying OSPFv3 information 48 ...
Page 1382: ...1310 BigIron RX Series Configuration Guide 53 1001810 01 Commands That Require a Reload D ...
Page 1435: ...BigIron RX Series Configuration Guide 1363 53 1001810 01 VSRP E ...
Page 1436: ...1364 BigIron RX Series Configuration Guide 53 1001810 01 VSRP E ...