Dell BigIron RX Series, Руководство по настройке

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664 BigIron RX Series Configuration Guide
53-1002253-01
Configuring IP multicast traffic reduction
23
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 99 .
Figure 100 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 RXs.
FIGURE 100 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.
Configuration requirements
•
IP multicast traffic reduction must be enabled on the device that will be running PIM SM
snooping. The PIM SM traffic snooping feature requires IP multicast traffic reduction.
NOTE
Use the passive mode of IP multicast traffic reduction instead of the active mode. The passive
mode assumes that a router is sending group membership queries as well as join and prune
messages on behalf of receivers. The active mode configures the device to send group
membership queries.
•
All the device ports connected to the source and receivers or routers must be in the same
port-based VLAN.
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