ZyXEL Communications GS1920-48HPv2, Руководство пользователя

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Chapter 24 Multicast
GS1920v2 Series User’s Guide
213
The following table describes the fields in the above screen.
Table 87 Advanced Application > Multicast > IPv6 Multicast > MLD Snooping-proxy > VLAN
LABEL DESC RIPTIO N
VID Enter the ID number of the VLAN on which you want to enable MLD snooping-proxy and
configure related settings.
Upstream
Query Interval Enter the amount of time (in miliseconds) between general query messages sent by the
router connected to the upstream port. This value should be exactly the same as what’s
configured in the connected multicast router.
This value is used to calculate the amount of time an MLD snooping membership entry
(learned only on the upstream port) can remain in the forwarding table.
When an MLD Report message is received, the Switch sets the timeout period of the entry
to be T = (QI*RV) + MRD, where T = Timeout, QI = Query Interval, RV = Robustness Variable,
and MRD = Maximum Response Delay.
Maximum Response
Delay Enter the amount of time (in miliseconds) the router connected to the upstream port waits
for a response to an MLD general query message. This value should be exactly the same
as what’s configured in the connected multicast router.
This value is used to calculate the amount of time an MLD snooping membership entry
(learned only on the upstream port) can remain in the forwarding table.
When an MLD Report message is received, the Switch sets the timeout period of the entry
to be T = (QI*RV) + MRD, where T = Timeout, QI = Query Interval, RV = Robustness Variable,
and MRD = Maximum Response Delay.
When an MLD Done message is received, the Switch sets the entry’s lifetime to be the
product of
La st Me m b e r Q ue ry Inte rva l
and
Ro b ustne ss Va ria b le
.
Robustness Variable Enter the number of queries. A multicast address entry (learned only on an upstream port
by snooping) is removed from the forwarding table when there is no response to the
configured number of queries sent by the router connected to the upstream port. This
value should be exactly the same as what’s configured in the connected multicast
router.
This value is used to calculate the amount of time an MLD snooping membership entry
(learned only on the upstream port) can remain in the forwarding table.
Last Member Query
Interval Enter the amount of time (in miliseconds) between the MLD group-specific queries sent by
an upstream port when an MLD Done message is received. This value should be exactly
the same as what’s configured in the connected multicast router.
This value is used to calculate the amount of time an MLD snooping membership entry
(learned only on the upstream port) can remain in the forwarding table after a Done
message is received.
When an MLD Done message is received, the Switch sets the entry’s lifetime to be the
product of
La st Me m b e r Q ue ry Inte rva l
and
Ro b ustne ss Va ria b le
.
Downstream
Query Interval Enter the amount of time (in miliseconds) between general query messages sent by the
downstream port.
Maximum Response
Delay Enter the maximum time (in miliseconds) that the Switch waits for a response to a general
query message sent by the downstream port.
Add Click this to create a new entry or to update an existing one.
This saves your changes to the Switch’s run-time memory. The Switch loses these changes
if it is turned off or loses power, so use the
Sa ve
link on the top navigation panel to save
your changes to the non-volatile memory when you are done configuring.
Cancel Click
C a nc e l
to reset the fields to your previous configuration.
Clear Click
C le a r
to reset the fields to the factory defaults.