HP 5500 Ei 5500 Si Switch Series Configuration Guide

 15 
Timer Description  Message before expiry Action after expiry 
Dynamic member port 
aging timer 
  When a port dynamically 
joins a multicast group, 
the switch starts an aging 
timer for the port. When 
the timer expires, the 
dynamic member port 
ages out.
  IGMP membership report 
 The switch removes this 
port from the IGMP 
snooping forwarding 
table.  
 
  
NOTE: 
In IGMP snooping, only dynamic ports  age out. Static ports never age out. 
 
How IGMP snooping works 
In this section, the involved...

 16 
reported multicast address suppress their own reports after receiving this report according to the IGMP 
report suppression mechanism. This prevents the swit ch from confirming whether the reported multicast 
group still has active members attached to that  port. For more information about the IGMP report 
suppression mechanism, see  Configuring IGMP (available only on the HP 5500 EI)   
When receiving a leave message 
W h e n  a n  I G M P v 1  h o s t  l e a v e s  a  m u l t i c a s t  g r o u p...

 17 
Figure 13  Network diagram 
 
 
As shown in Figure 13, Switch A works as an IGMP snooping proxy. As a host from the perspective of the 
querier Router A, Switch A represents its attached  hosts to send membership reports and leave messages 
to Router A.  
Table 6  IGMP message processing on an IGMP snooping proxy 
IGMP messa
ge Actions 
General query  When receiving an IGMP general query, the proxy forwards it to all 
ports but the receiving port. In addition, the proxy generates a report 
according...

 18 
Protocols and standards 
RFC 4541,  Considerations for Internet Group Management Protocol (IGMP) and Multicast Listener 
Discovery (MLD) Snooping Switches  
IGMP snooping configuration task list 
 
Task  Remarks  
Configuring basic 
IGMP snooping 
functions Enabling IGMP snooping 
Required
 
Specifying the version of IGMP snooping  Optional
 
Configuring static multicast MAC address entries  Optional 
Configuring IGMP 
snooping port 
functions Setting aging timers for dynamic ports 
Optional...

 19 
•  In IGMP snooping view, configurations that you make are effective on all ports. In Layer 2 Ethernet 
interface view or Layer 2 aggregate interface view,  configurations that you make are effective only 
on the current port. In port group view, configuratio ns that you make are effective on all ports in the 
current port group. For a given port, a configuration that you make in IGMP snooping view is 
effective only if you do not make the same configuration in Layer 2 Ethernet interface view, Layer...

 20 
If you change I GMPv3 snooping to I GMPv2 snooping, the system clears all I GMP snooping for warding 
entries that are dynamically added, and also does the following:  
•  Keeps static IGMPv3 snooping  forwarding entries (*, G). 
•   Clears static IGMPv3 snooping forwarding entries (S, G), which will be restored when IGMP 
snooping is switched back to IGMPv3 snooping. 
For more information about static joins, see  Configuring static ports.
  
Configuration procedure 
To specify the version of IGMP...

 21 
Step Command Remarks 
2.  Enter Layer 2 Ethernet 
interface view, Layer 2 
aggregate interface view, or 
port group view. 
• Enter Layer 2 Ethernet interface 
view or Layer 2 aggregate 
interface view: 
interface interface-type 
interface-number  
• Enter port group view: 
port-group manual 
port-group-name   Use either command. 
3.
  Configure a static multicast 
MAC address entry.  mac-address multicast 
mac-address vlan vlan-id
 No static multicast MAC address 
entries exist by default....

 22 
Configuring aging timers for dynamic ports in a VLAN 
 
Step Command Remarks  
1.  Enter system view. 
system-view  N/A 
2.  Enter VLAN view.  
vlan vlan-id   N/A 
3.  Set the aging timer for 
dynamic router ports.  igmp-snooping router-aging-time 
interval
  105 seconds by default
 
4.  Set the aging timer for 
dynamic member ports.  igmp-snooping host-aging-time 
interval
  260 seconds by default
 
 
Configuring static ports 
Configuration guidelines 
If all hosts attached to a port are interested...

 23 
Configuring a port as a simulated member host 
Configuration guidelines 
G e n e r a l l y,  a  h o s t  t h a t  r u n s  I G M P  c a n  r e s p o n d  t o  I G M P  q u e r i e s  t h a t  t h e  I G M P  q u e r i e r  s e n d s .  I f  a  h o s t  f a i l s  
to respond, the multicast router might deem that no member of this multicast group exists on the network 
segment, and removes the corresponding forwarding path.  
To avoid this situation, you can configure the port  as a simulated member...

 24 
processing if you have enabled dropping unknown mult icast data globally or for the port. Otherwise, if 
a host on the port leaves a multicast group, the othe r hosts attached to the port in the same multicast 
group cannot receive the multicast data for the group. 
Configuration procedure 
To enable fast-leave processing globally:   
Step Command Remarks  
1.   Enter system view. 
system-view  N/A 
2.  Enter IGMP-snooping view.  
igmp-snooping  N/A 
3.  Enable fast-leave processing.  
fast-leave  [...