D-Link xStack DGS-3600 Series User Manual - Ism Vlan Settings
xStack DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch
The following parameters can be set:
Parameter Description
VID (VLAN ID)
This is the VLAN ID that, along with the VLAN Name, identifies the VLAN where the multicast
router is attached.
VLAN Name
This is the name of the VLAN where the multicast router is attached.
Unit
This is the stacking unit where the VLAN is located where the multicast router is attached.
Member Ports
Ports on the Switch that will have a multicast router attached to them. There are three options for
which to configure these ports:
None
– Click this option to not set these ports as router ports
Static
– Click this option to designate a range of ports as being connected to a multicast-enabled
router. This command will ensure that all packets with this router as its destination will reach the
multicast-enabled router.
Forbidden
– Click this option to designate a port or range of ports as being forbidden from being
connected to multicast enabled routers. This ensures that these configured forbidden ports will
not send out routing packets.
Both
- Click this option to designate a port or range of ports as being both forbidden from being
connected to multicast enabled routers. This ensures that these configured forbidden ports will
not send out routing packets.
Click
Apply
to implement the new settings, Click the
Show All Router Port Entries
link to return to the
Router Port Settings
window.
ISM VLAN Settings
In a switching environment, multiple VLANs may exist. Every time a multicast query passes through the Switch, the switch must
forward separate different copies of the data to each VLAN on the system, which, in turn, increases data traffic and may clog up
the traffic path. To lighten the traffic load, multicast VLANs may be incorporated. These multicast VLANs will allow the Switch
to forward this multicast traffic as one copy to recipients of the multicast VLAN, instead of multiple copies.
Regardless of other normal VLANs that are incorporated on the Switch, users may add any ports to the multicast VLAN where
they wish multicast traffic to be sent. Users are to set up a source port, where the multicast traffic is entering the switch, and then
set the ports where the incoming multicast traffic is to be sent. The source port cannot be a recipient port and if configured to do
so, will cause error messages to be produced by the switch. Once properly configured, the stream of multicast data will be relayed
to the receiver ports in a much more timely and reliable fashion.
NOTE:
The ISM VLAN function in the current firmware release is only supported when the
Switch is in standalone mode
.
Restrictions and Provisos
The Multicast VLAN feature of this switch does have some restrictions and limitations, such as:
1. Multicast VLANs can only be implemented on edge switches.
2. Member ports and source ports can be used in multiple ISM VLANs. But member ports and source ports cannot be the
same port in a specific ISM VLAN.
3. The Multicast VLAN is exclusive with normal 802.1q VLANs, which means that VLAN IDs (VIDs) and VLAN Names
of 802.1q VLANs and ISM VLANs cannot be the same. Once a VID or VLAN Name is chosen for any VLAN, it cannot
be used for any other VLAN.
4. The normal display of configured VLANs will not display configured Multicast VLANs.
5. Once an ISM VLAN is enabled, the corresponding IGMP snooping state of this VLAN will also be enabled. Users
cannot disable the IGMP feature for an enabled ISM VLAN.
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