H3C Technologies H3C SecPath F1000-E - Manual (Page 178)

15
Enabling IPv6 PIM-DM
With IPv6 PIM-DM enabled, a router sends hello messages periodically to discover IPv6 PIM neighbors
and processes messages from the IPv6 PIM neighbors. When deploying an IPv6 PIM-DM domain, you
are recommended to enable IPv6 PIM-DM on all non-border interfaces of routers.
Follow these steps to enable IPv6 PIM-DM:
To do... Use the command... Remarks
Enter system view system-view —
Enable IPv6 multicast routing
multicast ipv6
routing-enable Required
Disable by default
Enter interface view
interface interface-type
interface-number
—
Enable IPv6 PIM-DM pim ipv6 dm
Required
Disabled by default
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.
NOTE:
For more information about the multicast ipv6 routing-enable command, see IPv6 Multicast Routing and
Forwarding Commands in the IP Multicast Volume.
Enabling State-Refresh Capability
Pruned interfaces resume multicast forwarding when the pruned state times out. To prevent this, 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 multi-access subnet can have the state-refresh capability
only if the state-refresh capability is enabled on all IPv6 PIM routers on the subnet.
Follow these steps to enable the state-refresh capability:
To do... Use the command... Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
—
Enable the state-refresh capability
pim ipv6
state-refresh-capable Optional
Enabled by default
Configuring State Refresh Parameters
The router directly connected with the multicast source periodically sends state-refresh messages. You can
configure the interval for sending such messages.