Configuring An Igmp Ssm Translation - Cisco Nexus 7000 Series Configuration Manual

Configuring IGMP

Configuring an IGMP SSM Translation

You can configure an SSM translation to provide SSM support when the router receives IGMPv1 or IGMPv2
membership reports. Only IMPv3 provides the capability to specify group and source addresses in membership
reports. By default, the group prefix range is 232.0.0./8. To modify the PIM SSM range, see Configuring
SSM.
The Internet Group Management Protocol (IGMP) Source-Specific Multicast (SSM) Translation feature
enables a SSM-based multicast core network to be deployed when the multicast host do not support IGMPv3
or is forced to send group joins instead of (S,G) reports to interoperate with layer-2 switches. The IGMP
SSM-Translation feature provides the functionality to configure multiple sources for the same SSM group.
Protocol Independent Multicast (PIM) must be configured on the device before configuring the SSM translation.
This Table lists the example SSM Translations.
Table 4: Table 3 Example SSM Translation
group
Prefix
232.0.0.0/8
232.0.0.0/8
232.1.0.0/16
232.1.1.0/24
This Table shows the resulting MRIB routes that the IGMP process creates when it applies an SSM translation
to the IMP membership report. If more than one translation applies, the router creates the (S,G) state for each
translation.
Table 5: Table 4 Example Result of Applying SSM Translations
IGMPv2 membership
Report
232.1.1.1
232.2.2.2
Note This feature is similar to SSM mapping found in some Cisco IOS software.
Command or Action
switch(config)# copy running-config
startup-config
Source
Address
10.1.1.1
10.2.2.2
10.3.3.3
10.4.4.4
Resulting MRIB Route
(10.4.4.4, 232.1.1.1)
(10.1.1.1, 232.2.2.2)(10.2.2.2, 232.2.2.2)
Cisco Nexus 7000 Series NX-OS Multicast Routing Configuration Guide
Configuring an IGMP SSM Translation
Purpose
31