H3C Technologies H3C S12500 Series Switches - Manual (Page 406)

390
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter IPv6 PIM view. pim ipv6 N/A
3. Configure the hash mask
length.
c-bsr hash-length hash-length
Optional.
126 by default.
4. Configure the C-BSR priority. c-bsr priority priority
Optional.
64 by default.
Configuring C-BSR timers
The BSR election winner multicasts its own IPv6 address and RP-Set information throughout the region to
which it is designated through bootstrap messages. The BSR floods bootstrap messages throughout the
network at the interval of the BS (BSR state) period. Any C-BSR that receives a bootstrap message retains
the RP-set for the length of BS timeout, during which no BSR election occurs. If the BSR state times out and
no bootstrap message is received from the BSR, a new BSR election process begins among the C-BSRs.
Perform the following configuration on C-BSR routers. If you set values for the BS period and the BS
timeout timer, the system uses the configured ones instead of the default ones.
To configure C-BSR timers:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter IPv6 PIM view. pim ipv6 N/A
3. Configure the BS period. c-bsr interval interval
Optional.
By default, the BS period is
determined by the formula "BS
period = (BS timeout – 10) / 2".
The default BS timeout is 130
seconds, so the default BS period =
(130 – 10) / 2 = 60 (seconds).
In configuration, make sure that the
BS period is smaller than the BS
timeout value.
4. Configure the BS timeout. c-bsr holdtime interval
Optional.
By default, the BS timeout value is
determined by the formula "BS
timeout = BS period × 2 + 10". The
default BS period is 60 seconds, so
the default BS timeout = 60 × 2 +
10 = 130 (seconds).
Disabling BSM semantic fragmentation
Generally, a BSR periodically distributes the RP-set information in bootstrap messages within the IPv6
PIM-SM domain. It encapsulates a BSM in an IPv6 datagram and might split the datagram into fragments
if the message exceeds the maximum transmission unit (MTU). In respect of such IP fragmentation, loss of
a single IP fragment leads to unavailability of the entire message.