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DGS-1520 Series Gigabit Ethernet Smart Managed Switch Web UI Reference Guide
302
Enter a page number and click the Go button to navigate to a specific page when multiple pages exist.
Click the Apply button to use the selected access list.
PIM SPT Threshold Settings
This window is used to display and configure the PIM SPT threshold settings. Use this feature on the last hop of the
router. In the PIM-SM mode, initially the multicast traffic from the source will be flowing along the RPT share tree to
the receiver. After the first packet arrives at the last hop router, for each group of traffic, it can operate in one of the
following two modes. With the mode Infinity, the traffic keeps following the share tree. With the mode 0, the source
tree will be established and the traffic Switchover to the source tree.
To view the following window, click L3 Features > IP Multicast Routing Protocol > PIM > PIM for IPv4 > PIM SPT
Threshold Settings, as shown below:
Figure 6-98 PIM SPT Threshold Settings Window
The fields that can be configured are described below:
Parameter Description
SPT Threshold
Select the SPT threshold option here. Options to choose from are:
• Infinity - Specifies to always rely on the shared tree.
• 0 - Specifies to establish the source tree right at the arrival of the first
packet.
By default, the Infinity option is used.
Select the Default option to use the default setting.
Click the Apply button to accept the changes made.
PIM SSM Settings
This window is used to display and configure the PIM SSM settings. Use this feature on the last hop of the router only.
When SSM is enabled, the last hop router will initiate to establish a source-based tree for the channel (S,G) on
receiving a IGMPv3 include (S, G) request that falls in the SSM range from the attached hosts.
To view the following window, click L3 Features > IP Multicast Routing Protocol > PIM > PIM for IPv4 > PIM SSM
Settings, as shown below:
Figure 6-99 PIM SSM Settings Window
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