426
Step
Command
Remarks
2.
Enter public network IPv6
PIM view or VPN instance
IPv6 PIM view
pim ipv6
[
vpn-instance
vpn-instance-name
]
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 that it serves 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 timer, during which no BSR election occurs.
If no bootstrap message is received from the BSR when the BS timeout timer expires, a new BSR
election process begins among the C-BSRs.
Perform the following configuration on C-BSR routers. If you set values for the C-BSR timers, 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 public network IPv6
PIM view or VPN instance
IPv6 PIM view.
pim ipv6
[
vpn-instance
vpn-instance-name
]
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 timer – 10) /
2." The default BS timeout timer is
130 seconds, so the default BS
period is (130 – 10) / 2 = 60
(seconds).
The BS period value must be
smaller than the BS timeout timer.
4.
Configure the BS timeout
timer.
c-bsr holdtime
interval
Optional.
By default, the BS timeout timer is
determined by the formula "BS
timeout timer = BS period × 2 +
10." The default BS period is 60
seconds, so the default BS
timeout timer is 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.
Semantic fragmentation of BSMs can solve this issue. When a BSM exceeds the MTU, it is split to
multiple bootstrap message fragments (BSMFs).
