Enabling State Refresh; Configuring State Refresh Parameters - 3Com MSR 50 Series Configuration Manual

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Enabling State Refresh

Configuring State
Refresh Parameters
To do...
Enter interface view
Enable IPv6 PIM-DM
CAUTION:
All the interfaces of the same device must work in the same IPv6 PIM mode.
■
IPv6 PIM-DM cannot be used for IPv6 multicast groups in the IPv6 SSM group
■
range.
An interface without the state refresh capability cannot forward state refresh
messages.
Follow these steps to enable state refresh:
To do...
Enter system view
Enter interface view
Enable state refresh
To avoid the resource-consuming reflooding of unwanted traffic caused by
timeout of pruned interfaces, the router directly connected with the IPv6 multicast
source periodically sends an (S, G) state refresh message, which is forwarded hop
by hop along the initial flooding path of the IPv6 PIM-DM domain, to refresh the
prune timer state of all the routers on the path.
A router may receive multiple state refresh messages within a short time, of which
some may be duplicated messages. To keep a router from receiving such
duplicated messages, you can configure the time the router must wait before
receiving the next state refresh message. If a new state refresh message is received
within the waiting time, the router will discard it; if this timer times out, the router
will accept a new state refresh message, refresh its own IPv6 PIM state, and reset
the waiting timer.
The hop limit value of a state refresh message decrements by 1 whenever it passes
a router before it is forwarded to the downstream node until the hop limit value
comes down to 0. In a small network, a state refresh message may cycle in the
network. To effectively control the propagation scope of state refresh messages,
you need to configure an appropriate hop limit value based on the network size.
Follow these steps to configure state refresh parameters:
To do...
Enter system view
Enter IPv6 PIM view
Use the command...
interface interface-type
interface-number
pim ipv6 dm
Use the command...
system-view
interface interface-type
interface-number
pim ipv6
state-refresh-capable
Use the command...
system-view
pim ipv6
Configuring IPv6 PIM-DM
Remarks
-
Required
Disabled by default
Remarks
-
-
Optional
Enabled by default
Remarks
-
-
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