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Page 176 / 400 Scroll up to view Page 171 - 175
User Manual for the NETGEAR 7300S Series Layer 3 Managed Switch Software
8-108
Switching Commands
202-10088-01, March 2005
set igmp mcrtrexpiretime
This command sets the Multicast Router Present Expiration time on the system. This is the amount
of time in seconds that a switch will wait for a query to be received on an interface before the
interface is removed from the list of interfaces with multicast routers attached. The range is 0 to
3600 seconds. A value of 0 indicates an infinite timeout, i.e. no expiration.
Default
0
Format
set igmp mcrtrexpiretime
<0-3600>
Mode
Global Config
no set igmp mcrtrexpiretime
This command sets the Multicast Router Present Expiration time on the system to 0. A value of 0
indicates an infinite timeout, i.e. no expiration.
Format
no set igmp mcrtrexpiretime
Mode
Global Config
s
how igmpsnooping
This command displays IGMP Snooping information. Configured information is displayed
whether or not IGMP Snooping is enabled. Status information is only displayed when IGMP
Snooping is enabled.
Format
show igmpsnooping
Mode
Privileged EXEC
Admin Mode
This indicates whether or not IGMP Snooping is active on the switch.
Group Membership Interval
This displays the IGMP Query Interval Time. This is the amount of time a
switch will wait for a report for a particular group on a particular interface
before it sends a query on that interface. This value may be configured
Max Response Time
This displays the amount of time the switch will wait after sending a query on an
interface because it did not receive a report for a particular group on that inter-
face. This value may be configured.
Multicast Router Present Expiration Time
If a query is not received on an interface within this
amount of time, the interface is removed from the list of interfaces with multi-
cast routers attached. This value may be configured.
Interfaces Enabled for IGMP Snooping
This is the list of interfaces on which IGMP Snooping is
enabled.
Page 177 / 400
User Manual for the NETGEAR 7300S Series Layer 3 Managed Switch Software
Switching Commands
8-109
202-10088-01, March 2005
Multicast Control Frame Count
This displays the number of multicast control frames that are pro-
cessed by the CPU.
show mac-address-table igmpsnooping
This command displays the IGMP Snooping entries in the Multicast Forwarding Database
(MFDB) table.
Format
show mac-address-table igmpsnooping
Mode
Privileged EXEC
Mac Address
A multicast MAC address for which the switch has forwarding and or filtering
information. The format is two-digit hexadecimal numbers that are separated by
colons, for example 01:23:45:67:89:AB. In an IVL system the MAC address
will be displayed as a MAC address and VLAN ID combination of 8 bytes.
Type
This displays the type of the entry. Static entries are those that are configured by
the end user. Dynamic entries are added to the table as a result of a learning pro-
cess or protocol.
Description
The text description of this multicast table entry.
Interfaces
The list of interfaces that are designated for forwarding (Fwd:) and filtering
(Flt:).
IGMP Snooping per VLAN
This section provides a detailed explanation of the IGMP Snooping per VLAN commands. The
commands are divided into two functional groups:
•
Show commands display spanning tree settings, statistics, and other information.
•
Configuration Commands configure features and options of the switch. For every
configuration
set igmp
This command enables IGMP snooping on a particular VLAN, and in turn enabling IGMP
snooping on all interfaces participating in this VLAN.
Default
disable
Format
set igmp <vlanId>
Page 178 / 400
User Manual for the NETGEAR 7300S Series Layer 3 Managed Switch Software
8-110
Switching Commands
202-10088-01, March 2005
Mode
Vlan Mode
no set igmp
This command disables IGMP snooping on a particular VLAN, and in turn disabling IGMP
snooping on all interfaces participating in this VLAN.
Format
no set igmp <vlanId>
Mode
Vlan Mode
set igmp groupmembershipinterval
This command sets the IGMP Group Membership Interval on a particular VLAN. The Group
Membership Interval time is the amount of time in seconds that a switch will wait for a report from
a particular group on a particular interface, which is participating in the VLAN, before deleting the
interface from the entry. This value must be greater than IGMP Maximum Response time value.
The range is 2 to 3600 seconds.
Default
260 seconds
Format
set igmp groupmembershipinterval <vlanId> <2-3600>
Mode
Vlan Mode
no set igmp groupmembershipinterval
This command sets the IGMP Group Membership Interval time on a particular VLAN to the
default value.
Format
no set igmp groupmembershipinterval <vlanId>
Mode
Vlan Mode
set igmp maxresponse
This command sets the IGMP Maximum Response time on a particular VLAN. The Maximum
Response time is the amount of time in seconds that a switch will wait after sending a query on an
interface, which is participating in the VLAN, because it did not receive a report for a particular
group in that interface. This value must be less than the IGMP Query Interval time value. The
range is 1 to 3599 seconds.
Default
10 seconds
Page 179 / 400
User Manual for the NETGEAR 7300S Series Layer 3 Managed Switch Software
Switching Commands
8-111
202-10088-01, March 2005
Format
set igmp maxresponse <vlanId> <1-3599>
Mode
Vlan Mode
no set igmp maxresponse
This command sets the IGMP Maximum Response time on the VLAN to the default value.
Format
no set igmp maxresponse <vlanId>
Mode
Vlan Mode
set igmp mcrtexpiretime
This command sets the Multicast Router Present Expiration time on a particular VLAN. This is the
amount of time in seconds that a switch will wait for a query to be received on an interface, which
is participating in the VLAN, before the interface is removed from the list of interfaces with
multicast routers attached. The range is 0 to 3600 seconds. A value of 0 indicates an infinite time-
out, i.e. no expiration.
Default
0
Format
set igmp mcrtexpiretime <vlanId> <0-3600>
Mode
Vlan Mode
no set igmp mcrtexpiretime
This command sets the Multicast Router Present Expiration time on the VLAN to 0. A value of 0
indicates an infinite time-out, i.e. no expiration.
Format
no set igmp mcrtexpiretime <vlanId>
Mode
Vlan Mode
set igmp fast-leave
This command enables or disables IGMP Snooping fast-leave admin mode on a selected VLAN.
Enabling fast-leave allows the switch to immediately remove the layer 2 LAN interface,
participating in the VLAN, from its forwarding table entry upon receiving an IGMP leave message
for that multicast group without first sending out MAC-based general queries to the interface.
Page 180 / 400
User Manual for the NETGEAR 7300S Series Layer 3 Managed Switch Software
8-112
Switching Commands
202-10088-01, March 2005
Fast-leave admin mode should be enabled only on VLANs where only one host is connected to
each layer 2 LAN port, to prevent the inadverdent dropping of the other hosts that were connected
to the same layer 2 LAN port but were still interested in receiving multicast traffic directed to that
group. Also, fast-leave processing is supported only with IGMP version 2 hosts.
Default
disable
Format
set igmp fast-leave <vlanId>
Mode
Vlan Mode
no set igmp fast-leave
This command disables IGMP Snooping fast-leave admin mode on a selected VLAN.
Format
no set igmp fast-leave <vlanId>
Mode
Vlan Mode
show igmpsnooping
This command displays IGMP Snooping information. Configured information is displayed
whether or not IGMP Snooping is enabled.
Format
show igmpsnooping
<vlanId>
Mode
Privileged EXEC
This display parameters when the optional argument ‘<vlanId>’ is not used are as follows:
Admin Mode
This indicates whether or not IGMP Snooping is active on the switch.
Interfaces Enabled for IGMP Snooping
This is the list of interfaces on which IGMP Snooping is
enabled.
Multicast Control Frame Count
This displays the number of multicast control frames that are pro-
cessed by the CPU.
Data Frames Forwarded by the CPU
This displays the number of data frames that are forwarded by
the CPU.
VLANS Enabled for IGMP Snooping
This is the list of VLANS on which IGMP Snooping is
enabled.
The display parameters when the argument is ‘<vlanId>’ are as follows:
VLAN Admin Mode
This indicates whether or not IGMP Snooping is active on the VLAN.

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