H3C Technologies H3C S12500 Series Switches - Manual (Page 416)

400
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 neighbor is lost
or the upstream neighbor has changed. In this case, it triggers a join message for state update.
If you disable join suppression (enable neighbor tracking), be sure to disable the join suppression feature
on all IPv6 PIM routers on a multi-access subnet. Otherwise, the upstream router will fail to explicitly track
join messages from downstream routers.
Configuring hello options globally
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter IPv6 PIM view. pim ipv6 N/A
3. Configure the priority for DR
election.
hello-option dr-priority priority
Optional.
1 by default.
4. Configure IPv6 PIM neighbor
timeout time.
hello-option holdtime interval
Optional.
105 seconds by default.
5. Configure the prune message
delay time (LAN-delay).
hello-option lan-delay interval
Optional.
500 milliseconds by default.
6. Configure the prune override
interval. hello-option override-interval
interval Optional.
2500 milliseconds by default.
7. Disable join suppression. hello-option neighbor-tracking Enabled by default.
Configuring hello options on an interface
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Configure the priority for DR
election. pim ipv6 hello-option dr-priority
priority Optional.
1 by default.
4. Configure IPv6 PIM neighbor
timeout time. pim ipv6 hello-option holdtime
interval Optional.
105 seconds by default.
5. Configure the prune message
delay time (LAN-delay).
pim ipv6 hello-option lan-delay
interval Optional.
500 milliseconds by default.
6. Configure the prune override
interval. pim ipv6 hello-option
override-interval interval
Optional.
2500 milliseconds by default.
7. Disable join suppression.
pim ipv6 hello-option
neighbor-tracking
Enabled by default.
8. Configure the interface to
reject hello messages without
a generation ID. pim ipv6 require-genid
By default, hello messages without
Generation_ID are accepted.