H3C S5500-EI - Page 178

159
Ste
p
Command Remarks
4. Configure the C-BSR priority.
c-bsr priority priority
Optional.
By default, the C-BSR priority is 64.
Configuring C-BSR timers
The BSR election winner multicasts its own IP address and RP-set information through bootstrap messages
within the entire zone to which it is designated. The BSR floods bootstrap messages throughout the
network at the interval of 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 takes place. If no bootstrap message is
received from the BSR before the BS timeout timer expires, a new BSR election process is triggered
among the C-BSRs.
Perform the following configuration on C-BSR routers.
To configure C-BSR timers:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter public network PIM view
or VPN instance PIM view.
pim [ 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 = 60 × 2 + 10 = 130
(seconds).
NOTE:
If you confi
g
ure the BS period or the BS timeout timer, the system uses the confi
g
ured one instead of the
default one.
Disabling BSM semantic fragmentation
Generally, a BSR periodically distributes the RP-set information in bootstrap messages within the PIM-SM
domain. It encapsulates a BSM in an IP datagram and might split the datagram into fragments if the