Protocols And Standards - HP A6600 Configuration Manual
Ip multicast
Hide thumbs
Also See for A6600:
- Configuration manual (501 pages) ,
- Getting started (222 pages) ,
- Limited warranty (41 pages)
Table of Contents
Advertisement
Figure 13 Network diagram for IGMP snooping proxying
As shown in
the querier Router A, Switch A represents its attached hosts to send membership reports and leave
messages to Router A.
Table 7 IGMP message processing on an IGMP snooping proxy
IGMP message
General query
Group-specific
query
Report
Leave
Protocols and standards
RFC 4541, Considerations for Internet Group Management Protocol (IGMP) and Multicast Listener
Discovery (MLD) Snooping Switches
Figure
13, Switch A works as an IGMP snooping proxy. As a host from the perspective of
Actions
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 to the group
memberships it maintains and sends the report out all router ports.
In response to the IGMP group-specific query for a certain multicast group, the proxy
sends the report to the group out all router ports if the forwarding entry for the group still
contains a member port.
When receiving a report for a multicast group, the proxy looks up the multicast
forwarding table for the entry for the multicast group. If the forwarding entry is found
with the receiving port contained as a dynamic member port in the outgoing port list,
the proxy resets the aging timer for the entry. If the forwarding entry is found but the
outgoing port list does not include the receiving port, the proxy adds the port to the
outgoing port list as a dynamic member port and starts an aging timer for it. If no
forwarding entry is found, the proxy creates the entry, adds the receiving port to the
outgoing port list as a dynamic member port and starts an aging timer for the port, and
then, sends a report to the group out all router ports.
In response to an IGMP leave message for a multicast group, the proxy sends a
group-specific query out the receiving port. After making sure that no member port is
contained in the forwarding entry for the multicast group, the proxy sends a leave
message to the group out all router ports.
17
Advertisement
Table of Contents
Troubleshooting
