Digisol DG-GS4826S, Management Manual

Page: 619 / 1344

C
HAPTER
22 | Multicast Routing
Configuring PIMv6 for IPv6
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C
ONFIGURING
PIM
I
NTERFACE
S
ETTINGS
Use the Routing Protocol > PIM6 > Interface page configure the routing
protocol’s functional attributes for each interface.
CLI R
EFERENCES
u
"IPv6 PIM Commands" on page 1292
C
OMMAND
U
SAGE
u
PIM-DM functions similar to DVMRP by periodically flooding the network
with traffic from any active multicast server. It also uses MLD to
determine the presence of multicast group members. The main
difference, is that it uses the router’s unicast routing table to determine
if the interface through which a packet is received provides the shortest
path back to the source.
u
Dense-mode interfaces are subject to multicast flooding by default, and
are only removed from the multicast routing table when the router
determines that there are no group members or downstream routers,
or when a prune message is received from a downstream router.
u
PIMv6 and MLD proxy cannot be used at the same time. When an
interface is set to use PIMv6 Dense mode, MLD proxy cannot be
enabled on any interface of the device (see "MLD Proxy Routing" on
page 1057 ). Also, when MLD proxy is enabled on an interface, PIMv6
cannot be enabled on any interface.
P
ARAMETERS
These parameters are displayed in the web interface:
u
VLAN – Layer 3 VLAN interface. (Range: 1-4093)
u
Mode – PIMv6 routing mode. (Options: Dense, None)
u
IPv6 Address – IPv6 link-local address assigned to the selected VLAN.
u
Hello Holdtime – Sets the interval to wait for hello messages from a
neighboring PIM router before declaring it dead. Note that the hello
holdtime should be greater than or equal to the value of Hello Interval,
otherwise it will be automatically set to 3.5 x the Hello Interval.
(Range: 1-65535 seconds; Default: 105 seconds, or 3.5 times the hello
interval if set)
u
Hello Interval – Sets the frequency at which PIM hello messages are
transmitted out on all interfaces. (Range: 1-65535 seconds;
Default: 30 seconds)
Hello messages are sent to neighboring PIM routers from which this
device has received probes, and are used to verify whether or not these
neighbors are still active members of the multicast tree. PIM-SM
routers use these messages not only to inform neighboring routers of
their presence, but also to determine which router for each LAN
segment will serve as the Designated Router (DR).
When a router is booted or first configured to use PIM, it sends an initial
hello message, and then sets its Hello timer to the configured value. If