Configuring Ipv6 Pim Hello Options - HP 4800G Series Configuration Manual

To do...
Enter system view
Enter interface view
Configure a hello message
filter
With the hello message filter configured, if hello messages of an existing IPv6 PIM neighbor fail to pass
the filter, the IPv6 PIM neighbor will be removed automatically when it times out.

Configuring IPv6 PIM Hello Options

No matter in an IPv6 PIM-DM domain or an IPv6 PIM-SM domain, the hello messages sent among
routers contain many configurable options, including:
DR_Priority (for IPv6 PIM-SM only): priority for DR election. The higher the priority is, the easier it is
for the router to win DR election. You can configure this parameter on all the routers in a
multi-access network directly connected to IPv6 multicast sources or receivers.
Holdtime: the timeout time of IPv6 PIM neighbor reachability state. When this timer times out, if the
router has received no hello message from an IPv6 PIM neighbor, it assumes that this neighbor
has expired or become unreachable.
LAN_Prune_Delay: the delay of prune messages on a multi-access network. This option consists
of Lan-delay (namely, prune delay), Override-interval, and neighbor tracking flag. If the LAN-delay
or override-interval values of different IPv6 PIM routers on a multi-access subnet are different, the
largest value will take effect. If you want to enable neighbor tracking, the neighbor tracking feature
should be enabled on all IPv6 PIM routers on a multi-access subnet.
The LAN-delay setting will cause the upstream routers to delay processing received prune messages. If
the LAN-delay setting is too small, it may cause the upstream router to stop forwarding IPv6 multicast
packets before a downstream router sends a prune override message. Therefore, be cautious when
configuring this parameter.
The override-interval sets the length of time a downstream router is allowed to wait before sending a
prune override message. When a router receives a prune message from a downstream router, it does
not perform the prune action immediately; instead, it maintains the current forwarding state for a period
of LAN-delay plus override-interval. If the downstream router needs to continue receiving IPv6 multicast
data, it must send a prune override message within the prune override interval; otherwise, the upstream
route will perform the prune action when the period of LAN-delay plus override-interval time out.
A hello message sent from an IPv6 PIM router contains a generation ID option. The generation ID is a
random value for the interface on which the hello message is sent. Normally, the generation ID of an
IPv6 PIM router does not change unless the status of the router changes (for example, when IPv6 PIM
is just enabled on the interface or the device is restarted). When the router starts or restarts sending
hello messages, it generates a new generation ID. If an IPv6 PIM router finds that the generation ID in a
hello message from the upstream router has changed, it assumes that the status of the upstream
Use the command...
system-view
interface interface-type
interface-number
pim ipv6 neighbor-policy
acl6-number
1-29
Remarks
—
—
Required
No hello message filter by default.