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DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch CLI Manual
327
DGS-3627:admin# show mld_snooping group
Command: show mld_snooping group
Source/Group
: 2001::1/FE1E::1
VLAN Name/VID
:default/1
Port Member
: 1-2
Mode
: INCLUDE
Source/Group
: 2002::2/FE1E::1
VLAN Name/VID:
: default/1
Port Member
: 3
Mode
: EXCLUDE
Source/Group
: NULL/FE1E::2
VLAN Name/VID
: default/1
Port Member
: 4-5
Mode
: EXCLUDE
Total Entries : 3
DGS-3627:admin#
show mld_snooping forwarding
Purpose
This command displays the switch’s current MLD snooping forwarding table.
Syntax
show mld_snooping forwarding {[vlan <vlan_name 32> | vlanid <vlanid_list>]}
Description
It provides an easy way for users to check the list of ports that the multicast group that comes
from specific sources will be forwarded to. The packet comes from the source VLAN. They
will be forwarded to the forwarding VLAN. The MLD snooping further restricts the forwarding
ports.
Parameters
vlan
- (Optional) Specify the name of the VLAN for which you want to view MLD snooping
forwarding table information.
<
vlan_name 32
> - Enter the VLAN name here. The VLAN name can be up to 32 characters
long.
vlanid
- (Optional) Specify the ID of the VLAN for which you want to view MLD snooping
forwarding table information.
<
vlanid_list
> - Enter the VLAN ID list here.
If no parameter is specified, the system will display all current MLD snooping forwarding table
entries of the switch.
Restrictions
None.
Example usage:
To show all MLD snooping forwarding entries located on the switch:
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DGS-3627:admin# show mld_snooping forwarding
Command: show mld_snooping forwarding
VLAN Name
: default
Source IP
: 2001::1
Multicast Group: FE1E::1
Port Member
: 2,7
VLAN Name
: default
Source IP
: 2001::2
Multicast Group: FF1E::1
Port Member
: 5
Total Entries : 2
DGS-3627:admin#
show mld_snooping mrouter_ports
Purpose
Used to display the currently configured router ports on the switch.
Syntax
show mld_snooping mrouter_ports vlan <vlan_name 32> {[static | dynamic |
forbidden]}
Description
This command displays the currently configured router ports on the switch.
Parameters
vlan
- Specify the name of the VLAN on which the router port resides.
vlanid
- Specify the ID of the VLAN on which the router port resides.
all
- Specify all VLANs on which the router port resides.
static
- Displays router ports that have been statically configured.
dynamic
- Displays router ports that have been dynamically configured.
forbidden
- Displays forbidden router ports that have been statically configured.
If no parameter is specified, the system will display all currently configured router ports on the
switch.
Restrictions
None.
Example usage:
To display the mld_snooping router ports:
DGS-3426P:admin#show mld_snooping mrouter_ports
Command: show mld_snooping mrouter_ports
VLAN Name
: default
Static mrouter port
:
Dynamic mrouter port
:
1-10
Forbidden mrouter port:
Total Entries: 1
DGS-3627:admin#
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42
INTERNET GROUP MANAGEMENT PROTOCOL (IGMP)
COMMANDS
IGMP or Internet Group Management Protocol is a protocol implemented by systems utilizing IPv4 to collect the
membership information needed by the multicast routing protocol through various query messages sent out from the
router or switch. Computers and network devices that want to receive multicast transmissions need to inform nearby
routers that they will become members of a multicast group. The Internet Group Management Protocol (IGMP) is used to
communicate this information. IGMP is also used to periodically check the multicast group for members that are no longer
active.
In the case where there is more than one multicast router on a subnetwork, one router is elected as the ‘querier’. This
router then keeps track of the membership of the multicast groups that have active members. The information received
from IGMP is then used to determine if multicast packets should be forwarded to a given subnetwork or not. The router
can check, using IGMP, to see if there is at least one member of a multicast group on a given subnetwork. If there are no
members on a subnetwork, packets will not be forwarded to that subnetwork.
The current release of the Switch now implements IGMPv3. Improvements of IGMPv3 over version 2 include:
•
The introduction of the SSM or Source Specific Multicast. In previous versions of IGMP, the host would receive
all packets sent to the multicast group. Now, a host will receive packets only from a specific source or sources.
This is done through the implementation of include and exclude filters used to accept or deny traffic from these
specific sources.
•
In IGMPv2, Membership reports could contain only one multicast group whereas in v3, these reports can contain
multiple multicast groups.
•
Leaving a multicast group could only be accomplished using a specific leave message in v2. In v3, leaving a
multicast group is done through a Membership report which includes a block message in the group report packet.
•
For version 2, the host could respond to either a group query but in version 3, the host is now capable to answer
queries specific to the group and the source.
IGMPv3 is backwards compatible with other versions of IGMP and all IGMP protocols must be used in conjunction with
PIM or DVMRP for optimal use.
The Internet Group Management Protocol (IGMP) is used by IPv4 systems (hosts and routers) to report their IP multicast
group memberships to any neighboring multicast routers.
Note that an IP multicast router can simultaneously be a member of one or more multicast groups, in which case it
performs dual functions as both a multicast router (the “multicast router part” of the protocol, namely to collect the
membership information needed by its multicast routing protocol); and as a group member (the “group member part” of
the protocol, that is to inform itself and other neighboring multicast routers of its memberships).
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The Internet Group Management Protocol (IGMP) commands in the Command Line Interface (CLI) are listed (along with
the appropriate parameters) in the following table.
Command
Parameters
config igmp
[ipif <ipif_name 12>|all] { version <value 1-3> | query_interval <sec 1-31744> |
max_response_time <sec 1-25> | robustness_variable <value 1-255> |
last_member_query_interval <value 1-25> | state [enable | disable]}
show igmp
{ipif <ipif_name 12>}
show igmp group
{group <group>} {ipif <ipif_name 12>}
config igmp
check_subscriber_source_network
[ ipif <ipif_name 12> | all ] [ enable | disable ]
show igmp
check_subscriber_source_network
{ipif <ipif_name 12>}
Each command is listed, in detail, in the following sections.
config igmp
Purpose
This command is used to configure IGMP on the switch.
Syntax
config igmp [ipif <ipif_name 12>|all] { version <value 1-3> | query_interval <sec 1-
31744> | max_response_time <sec 1-25> | robustness_variable <value 1-255> |
last_member_query_interval <value 1-25> | state [enable | disable]}
Description
The config igmp command is used to configure IGMP on switch.
Parameters
ipif_name
- The name of the IP interface for which you want to configure IGMP.
all
- Specifies all the IP interfaces on the switch.
version
- IGMP version. The default value is 3.
query_interval
- The time in seconds between general query transmissions. The default value
is 125.
max_response_time
- The maximum time in seconds to wait for reports from members. The
default value is 10.
robustness_variable
- The permitted packet loss that guarantees IGMP. The default value is
2.
last_member_query_interval
- Max Response Time inserted into Group-Specific Queries sent
in response to Leave Group messages, and is also the amount of time between Group-
Specific Query messages. The default setting is 1.
state
- Enable or disable IGMP on a router interface.
Restrictions
Only Administrator and Operator-level users can issue this command.
Example usage:
To configure the IGMP for the IP interface “System”:
DGS-3627:admin# config igmp ipif System version 1 state enable
Command: config igmp ipif System version 1 state enable
Success.
DGS-3627:admin#
To configure the IGMPv2 for all IP interfaces:
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DGS-3627:admin# config igmp all version 2
Command: config igmp all version 2
Success.
DGS-3627:admin#
show igmp
Purpose
This command is used to display the IGMP configurations.
Syntax
show igmp {ipif <ipif_name 12>}
Description
The show igmp command displays the IGMP configurations.
Parameters
ipif_name
- IP interface name.
If no parameter specified, the system will display all IGMP configurations.
Restrictions
None.
Example usage:
To display IGMP configurations for all interfaces:
DGS-3627:admin# show igmp
Command: show igmp
IGMP Interface Configurations
Interface
IP Address/Netmask
Ver- Query
Maximum
Robust- Last
State
sion
Response ness
Member
Time
Value
Query
Interval
------------ ------------------
---- ------ -------- ------- -------- --------
System
10.90.90.90/8
3
125
10
2
1
Disabled
Total Entries: 1
DGS-3627:admin#
show igmp group
Purpose
This command is used to display the switch’s IGMP group table.
Syntax
show igmp group {group <group>} {ipif <ipif_name 12>}
Description
The show igmp group command displays the switch’s IGMP group table.
Parameters
group
- The multicast group ID.
ipif_name
- The name of the IP interface the IGMP group is part of.
If no parameter specified, the system will display all IGMP group tables.
Restrictions
None.
Example usage:
To display IGMP group table:

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