(Optional) Displays the multicast groups with receivers that are directly connected to the router and that were learned
through IGMP.
The following is sample output from the show ip igmp groups command with the group-address argument and detail
keyword. In this example the “M” flag indicates that SSM mapping is configured.
Example:
Device# show ip igmp group 232.1.1.4 detail
Interface: GigabitEthernet2/0/0
Group: 232.1.1.4 SSM
Uptime: 00:03:20
Group mode: INCLUDE
Last reporter: 0.0.0.0
CSR Grp Exp: 00:02:59
Group source list: (C - Cisco Src Report, U - URD, R - Remote,
S - Static, M - SSM Mapping)
Source Address Uptime v3 Exp CSR Exp Fwd Flags
172.16.8.3 00:03:20 stopped 00:02:59 Yes CM
172.16.8.4 00:03:20 stopped 00:02:59 Yes CM
172.16.8.5 00:03:20 stopped 00:02:59 Yes CM
172.16.8.6 00:03:20 stopped 00:02:59 Yes CM
Step 5
show host
(Optional) Displays the default domain name, the style of name lookup service, a list of name server hosts, and the cached
list of hostnames and addresses.
The following is sample output from the show hostcommand. Use this command to display DNS entries as they are
learned by the router.
Example:
Device# show host
Default domain is cisco.com
Name/address lookup uses domain service
Name servers are 10.48.81.21
Codes: UN - unknown, EX - expired, OK - OK, ?? - revalidate
temp - temporary, perm - permanent
NA - Not Applicable None - Not defined
Host Port Flags Age Type Address(es)
10.0.0.0.ssm-map.cisco.c None (temp, OK) 0 IP 172.16.8.5
172.16.8.6
172.16.8.3
172.16.8.4
Step 6
debug ip igmp group-address
(Optional) Displays the IGMP packets received and sent and IGMP host-related events.
The following is sample output from the debug ip igmpcommand when SSM static mapping is enabled. The following
output indicates that the router is converting an IGMPv2 join for group G into an IGMPv3 join:
Example:
IGMP(0): Convert IGMPv2 report (*,232.1.2.3) to IGMPv3 with 2 source(s) using STATIC.
The following is sample output from the debug ip igmp command when DNS-based SSM mapping is enabled. The
following output indicates that a DNS lookup has succeeded:
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3.6E (Catalyst 3850 Switches)
278 OL-32598-01
Configuring SSM
Configuring SSM Mapping
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