H3C Technologies H3C S12500 Series Switches - Manual (Page 419)

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Configuring BFD for IPv6 PIM
IPv6 PIM uses hello messages to elect a DR for a multi-access network. The elected DR will be the only
multicast forwarder on the multi-access network.
If the DR fails, a new DR election process will start after the DR is aged out. However, it might take a long
period of time. To start a new DR election process immediately after the original DR fails, you can enable
BFD for IPv6 PIM on a multi-access network to detect failures of the links among IPv6 PIM neighbors. You
must enable BFD for IPv6 PIM on all IPv6 PIM-capable routers on a multi-access network, so that the IPv6
PIM neighbors can fast detect DR failures and start a new DR election process.
Before you configure this feature on an interface, be sure to enable IPv6 PIM-DM or IPv6 PIM-SM on the
interface.
To enable BFD for IPv6 PIM:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Enable BFD for IPv6 PIM. pim ipv6 bfd enable Disabled by default.
For more information about BFD, see High Availability Configuration Guide.
Displaying and maintaining IPv6 PIM
Task Command Remarks
Display the BSR information in
the IPv6 PIM-SM domain and
locally configured C-RP
information in effect.
display pim ipv6 bsr-info [ | { begin | exclude |
include } regular-expression ]
Available in any view.
Display IPv6 unicast routes used
by IPv6 PIM.
display pim ipv6 claimed-route
[ ipv6-source-address ] [ | { begin | exclude |
include } regular-expression ]
Available in any view.
Display the number of IPv6 PIM
control messages.
display pim ipv6 control-message counters
[ message-type { probe | register | register-stop }
| [ interface interface-type interface-number |
message-type { assert | bsr | crp | graft |
graft-ack | hello | join-prune | state-refresh } ] * ]
[ | { begin | exclude | include }
regular-expression ]
Available in any view.
Display information about
unacknowledged PIM-DM graft
messages.
display pim ipv6 grafts [ | { begin | exclude |
include } regular-expression ]
Available in any view.
Display IPv6 PIM information
on an interface.
display pim ipv6 interface [ interface-type
interface-number ] [ verbose ] [ | { begin | exclude
| include } regular-expression ]
Available in any view.