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C H A P T E R  8
Monitoring IGMP Snooping

This chapter describes the Internet Group Management Protocol (IGMP) feature: IGMPv3 and IGMP Snooping.

The IGMP Snooping feature enables the switch to monitor IGMP transactions between hosts and routers. It can help conserve bandwidth by allowing the switch to forward IP multicast traffic only to connected hosts that request multicast traffic.

This chapter contains the following topics:

CLI Examples

The following are examples of the commands used in the IGMP Snooping feature.

Example 1: show igmpsnooping


CODE EXAMPLE 8-1 show igmpsnooping 
(DTI SWITCH) 	#show igmpsnooping ?
 
<cr>	Press Enter to execute the command.
<unit/slot/port>	Enter interface in unit/slot/port format.
mrouter	Display IGMP Snooping Multicast Router information.
<1-4093>	Display IGMP Snooping valid VLAN ID information.
 
(DTI SWITCH) 	#show igmpsnooping
 
Admin Mode...............................		Enable
Multicast Control Frame Count............		0
Interfaces Enabled for IGMP Snooping.....0/10
Vlans enabled for IGMP snooping.....	.....	20

Example 2: show ip igmp Interface


CODE EXAMPLE 8-2 show ip igmp Interface 
(LVL7 FASTPATH Routing Switching) 	#show ip igmp interface ?
 
<slot/port>	Enter interface in unit/slot/port format.
membership	Display interfaces subscribed to the multicast group.
stats	Display IGMP statistical information.
 
(LVL7 FASTPATH Routing Switching) 	#show ip igmp interface 0/10
 
Slot/Port......................................		0/10
IGMP Admin Mode................................		Enable
Interface Mode.................................		Disable
IGMP Version...................................		3
Query Interval (secs)..........................		125
Query Max Response Time (1/10 of a second)... 100
Robustness.....................................		2
Startup Query Interval (secs)................	..	31
Startup Query Count..........................	..	2
Last Member Query Interval (1/10 of a second)..		10
Last Member Query Count......................	..	2

Example 3: show mac-address-table igmpsnooping


CODE EXAMPLE 8-3 show mac-address-table igmpsnooping 
(DTI SWITCH) #show mac-address-table igmpsnooping ?
 
<cr>                     Press Enter to execute the command.
 
(DTI SWITCH) #show mac-address-table igmpsnooping
 
Type	Description	Interfaces
----------------------- 	-------	--------------	-----------
00:01:01:00:5E:00:01:16	Dynamic	Network Assist	Fwd: 0/47
00:01:01:00:5E:00:01:18	Dynamic	Network Assist	Fwd: 0/47
00:01:01:00:5E:37:96:D0	Dynamic	Network Assist	Fwd: 0/47
00:01:01:00:5E:7F:FF:FA	Dynamic	Network Assist	Fwd: 0/47
00:01:01:00:5E:7F:FF:FE	Dynamic	Network Assist	Fwd: 0/47
 

Example 4: show ip igmp interface


CODE EXAMPLE 8-4 show ip igmp interface 
(DTI SWITCH) #show ip igmp interface 0/2
 
Slot/Port...................................... 0/2
IGMP Admin Mode................................ Disable
Interface Mode................................. Disable
IGMP Version................................... 3
Query Interval (secs).......................... 125
Query Max Response Time (1/10 of a second)..... 100
Robustness..................................... 2
Startup Query Interval (secs) ................. 31
Startup Query Count............................ 2
Last Member Query Interval (1/10 of a second).. 10
Last Member Query Count........................ 2

Example 5: (Config) #ip igmp


CODE EXAMPLE 8-5 (Config) #ip igmp 
(LVL7 FASTPATH Routing Switching) 	(Config)#ip igmp ?
 
<cr>	Press Enter to execute the command.
 

Example 6: #show ip igmp


CODE EXAMPLE 8-6 #show ip igmp 
(LVL7 FASTPATH Routing Switching) 	#show ip igmp ?
 
<cr>	Press Enter to execute the command.
groups	Display the subscribed multicast groups.
interface	Display IGMP configuration information.

Example 7: (Interface 1/0/2) #ip igmp


CODE EXAMPLE 8-7 (Interface 1/0/2) #ip igmp 
(LVL7 FASTPATH Routing Switching) 	(Interface 0/2)#ip igmp ?
 
<cr>	Press Enter to execute the command.
last-member-query-count	Configure last member query count.
last-member-query-interval 	Configure last member query interval.
query-interval	Configure IGMP query interval.
query-max-response-time	Configure maximum response time.
robustness	Configure IGMP router robustness.
startup-query-count	Configure startup query count.
startup-query-interval	Configure startup query interval.
version	Configure IGMP or IGMP Proxy version.

Web Examples

The following web pages are used in the IGMP Snooping feature. Click Help for more information on the web interface.

FIGURE 8-1 IGMP Snooping - Global Configuration and Status Page


FIGURE 8-2 IGMP Snooping - Interface Configuration Page


FIGURE 8-3 IGMP Snooping VLAN Configuration


FIGURE 8-4 IGMP Snooping - VLAN Status Page


FIGURE 8-5 IGMP Snooping - Multicast Router Statistics Page


FIGURE 8-6 IGMP Snooping - Multicast Router Configuration Page


FIGURE 8-7 IGMP Snooping - Multicast Router VLAN Statistics Page


FIGURE 8-8 IGMP Snooping - Multicast Router VLAN Configuration Page


 


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