OcNOS-SP : Multicast Guide : Multicast Command Reference : Layer 3 IGMP Multicast Commands : show ip igmp groups
show ip igmp groups
Use this command to display the multicast groups with receivers connected to the router and learned through IGMP.
Command Syntax
show ip igmp groups (detail|)
show ip igmp groups A.B.C.D (detail|)
show ip igmp groups IFNAME (detail|)
show ip igmp groups IFNAME A.B.C.D (detail|)
show ip igmp (vrf NAME|) groups (detail|)
show ip igmp (vrf NAME|) groups A.B.C.D (detail|)
show ip igmp (vrf NAME|) groups IFNAME (detail|)
show ip igmp (vrf NAME|) groups IFNAME A.B.C.D (detail|)
Parameters
vrf
Specify the VRF name.
A.B.C.D
Address of multicast group.
IFNAME
Name of the interface.
detail
IGMPv3 source information.
Command Mode
Exec and Privileged Exec mode
Applicability
This command was introduced before OcNOS version 1.3.
Examples
The following command displays local-membership information for all interfaces:
rtr1#show ip igmp groups detail
IGMP Connected Group Membership Details
 
Flags: (M - SSM Mapping, R - Remote, L - Local,
SG - Static Group, SS - Static Source)
Interface: eth1
Group: 224.1.1.1
Flags: L
Uptime: 00:00:04
Group mode: Exclude (Expires: 00:04:15, Static)
Last reporter: 3.3.3.3
Group source list: (R - Remote, M - SSM Mapping, S - Static, L - Local)
Include Source List :
Source Address Uptime v3 Exp Fwd Flags
2.2.2.2 00:00:04 stopped Yes L
 
Table 2-8 shows the flags codes displayed at the start of a group entry.
 
Table 2-8: Flags
Flag
Meaning
M
Source Specific Multicast
R
Remote multicast
L
Local multicast
SG
Static Group
SS
Static Source
 
Table 2-9 explains the output fields.
 
Table 2-9: show ip igmp groups output
Entry
Description
Interface
The interface on which multicast is operating.
Group
The Multicast group, identified by a multicast IP address.
Flags
Flag on this interface – in this case, the flag indicates that the multicast is Local. See Table 2-8.
Uptime
The amount of time that the multicast connection has been up.
Group mode
The group mode is determined by interactions between IGMP router database entries, which is beyond the scope of this document. For a detailed description of these interactions, see RFC 3376.
Last reporter
The IPv4 address of the last host to send multicast information.
Group source list
A list of flags that indicate the state of the multicast connections. See Table 2-8.
Include Source List
A table containing parameters about the multicast session:
• Source Address – The IP address of the Source(s) connected to the multicast hosts.
• Uptime – The multicast session’s uptime.
• v3 Exp – Tells whether IGMPv3 Explicit Tracking is running or not.
• Fwd – Whether IGMP information is being forwarded by this device.
• Flags – See Table 2-8.
Last modified date: 10/20/2023