Default Igmp Snooping Configuration - Cisco 7604 Configuration Manual
Ios software configuration guide
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Chapter 30
Configuring IGMP Snooping for IPv4 Multicast Traffic
Note
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Explicit Host Tracking
IGMPv3 supports explicit tracking of membership information on any port. The explicit-tracking
database is used for fast-leave processing for IGMPv3 hosts, proxy reporting, and statistics collection.
When explicit tracking is enabled on a VLAN, the IGMP snooping software processes the IGMPv3
report it receives from a host and builds an explicit-tracking database that contains the following
information:
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Default IGMP Snooping Configuration
Table 30-3
Table 30-3 IGMP Snooping Default Configuration
Feature
IGMP snooping querier
IGMP snooping
Multicast routers
IGMPv3 proxy reporting
IGMP snooping router learning
method
Fast-Leave Processing
IGMPv3 Explicit Host Tracking
IGMPv3 SSM Safe Reporting
OL-4266-08
Source-based filtering for IGMP version 3 reports is not supported in hardware. The states are
maintained only in software and used for explicit host tracking and statistics collection. The
source-only entries are deleted every 5 minutes and relearned to ensure that they are still valid.
Turning off explicit host tracking disables fast-leave processing and proxy reporting.
The port connected to the host
The channels reported by the host
The filter mode for each group reported by the host
The list of sources for each group reported by the hosts
The router filter mode of each group
For each group, the list of hosts requesting the source
Turning off explicit host tracking disables fast-leave processing and proxy reporting.
When explicit tracking is enabled and the router is working in proxy-reporting mode, the router may
not be able to track all the hosts behind a VLAN interface.
shows the default IGMP snooping configuration.
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
Default Values
Disabled
Enabled
None configured
Enabled
Learned automatically through PIM or IGMP packets
Disabled
Enabled
Disabled; deprecated in Release 12.2(18)SXE and later releases
Default IGMP Snooping Configuration
30-7
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