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Configuring the global C-BSR parameters
In each PIM-SM domain, a unique BSR is elected from C-BSRs. The C-RPs in the PIM-SM domain
send advertisement messages to the BSR. The BSR summarizes the advertisement messages to
form an RP-set and advertises it to all routers in the PIM-SM domain. All routers use the same hash
algorithm to get the RP address that corresponds to specific multicast groups.
The following rules apply to the hash mask length and C-BSR priority:
•
You can configure the hash mask length and C-BSR priority globally, in an admin-scope zone,
and in the global scope zone.
•
The values configured in the global scope zone or admin-scope zone have preference over the
global values.
•
If you do not configure these parameters in the global scope zone or admin-scope zone, the
corresponding global values are used.
For configuration of C-BSR parameters for an admin-scope zone and the global scope zone, see
"
Configuring C-BSRs for each admin-scope zone and the global-scope zone
Perform the following configuration on C-BSR routers.
To configure C-BSR parameters:
Step 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 hash mask
length.
c-bsr hash-length
hash-length
Optional.
30 by default.
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 it serves. 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 timer, during which no BSR election takes place. If no
bootstrap message is received from the BSR when the BS timeout timer expires, a new BSR election
process is triggered 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 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
