Cisco Catalyst 3850 series User Manual

Example:
IGMP(0): Convert IGMPv2 report (*,232.1.2.3) to IGMPv3 with 2 source(s) using DNS.
The following is sample output from the debug ip igmp command when DNS-based SSM mapping is enabled and a
DNS lookup has failed:
IGMP(0): DNS source lookup failed for (*, 232.1.2.3), IGMPv2 report failed
Related Topics
Static SSM Mapping, on page 265
SSM Mapping Overview, on page 264
Configuring Basic IP Multicast Routing, on page 290
DNS-Based SSM Mapping, on page 265
SSM Mapping Overview, on page 264
Configuring Basic IP Multicast Routing, on page 290
Configuring Static Traffic Forwarding with SSM Mapping (CLI), on page 274
Monitoring SSM and SSM Mapping
Monitoring SSM
To monitor SSM, use the following commands in privileged EXEC mode, as needed:
PurposeCommand
Displays the (S, G) channel subscription through
IGMPv3.
Device# show ip igmp groups detail
Displays whether a multicast group supports SSM
service or whether a source-specific host report was
received.
Device# show ip mroute
Monitoring SSM Mapping
Use the privileged EXEC commands in the following table to monitor SSM mapping.
Table 19: SSM Mapping Monitoring Commands
PurposeCommand
Displays information about SSM mapping.Device# show ip igmp ssm-mapping
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3.6E (Catalyst 3850 Switches)
OL-32598-01 279
Configuring SSM
Monitoring SSM and SSM Mapping

Cisco Catalyst 3850 series Specifications

General

Brand	Cisco
Model	Catalyst 3850 series
Category	Switch
Language	English