OmniSwitch OS6860/OS6900/OS10K Troubleshooting Guide Part No.032996-00 Rev.A
AOS Release 7.X and 8.X January 2015
Alcatel-Lucent Page 101 of 148
IP: Source Address = 0.0.0.0
IP: Destination Address = 224.0.0.1
IP: Options & Padding = 0x94040000
IP:
IGMP: ------ IGMP Header -----------
IGMP:
IGMP: Version = 2 (0x2)
IGMP: Type = Membership Query (0x11)
IGMP: Max Response Time = 25 (0x19)
IGMP: Checksum = 0xEEE6
IGMP: Group = 0.0.0.0
IGMP:
Proxying
The proxying feature is used to optimize IGMP Membership Report traffic between an access switch and a
querier. The access switch creates a table of registered subscribers containing IP address of multicast group, a
port, VLAN id, IGMP version, mode and SSM address. Each time a new IGMP Membership Report is
received, the access switch verifies if it is a new registration (new IP multicast group in a VLAN). If necessary
(if it is a new registration) IGMP Membership Report is forwarded to the querier. If the group in IGMP
Membership Report is already registered there’s no need to forward any messages to the querier (there’s no
need to update querier’s registration database), only the table of registered subscribers on the access switch is
updated with the port on which the new registration was received. Example (proxying disabled):
Example (proxying enabled):
Proxying enabled case. All IGMP Membership Reports generated by the access switch have IP source
address inherited from the first received IGMP Membership Reports for a specific IP multicast group.
Spoofing
When the spoofing feature is enabled, source IP address of each IGMP Membership Report is updated
according to IP interface address in the VLAN in which the IGMP Membership Report was received. Other
IGMP messages are not affected. Example (without IPMVLAN):
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