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PIM BSR configuration

PIM BSR configuration

Created: Jan 20, 2020 03:00:27Latest reply: Jan 20, 2020 03:04:21 172 1 0 0 1
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display all floors #1

Hello team,

We configured 4 x devices as BSR candidates. The priority is marked as 255 on core 1(S7703), when using the display pim rp-info comand, the output shows the priority is 0.  But the output of the display pim bsr-info command shows that the priority is 255. Is it normal? Thank you.

Configuration of Core 1:

#

pim

c-bsr priority 255

c-bsr LoopBack0

c-rp LoopBack0

graceful-restart

#

[Core_1]display pim rp-info

 VPN-Instance: public net

PIM-SM BSR RP Number:4

Group/MaskLen: 224.0.0.0/4

     RP: 10.17.0.1

     Priority: 100

     Uptime: 6d:05h

     Expires: 00:02:17

Group/MaskLen: 224.0.0.0/4

     RP: 10.17.0.2

     Priority: 150

     Uptime: 6d:05h

     Expires: 00:01:46

Group/MaskLen: 224.0.0.0/4

     RP: 10.18.0.1(local)

     Priority: 0

     Uptime: 6d:05h

     Expires: 00:02:11

Group/MaskLen: 224.0.0.0/4

     RP: 10.18.0.2

     Priority: 50

     Uptime: 6d:05h

     Expires: 00:01:50


[Core_1]display pim bsr-info

VPN-Instance: public net

Elected AdminScoped BSR Count: 0

Elected BSR Address: 10.18.0.1

     Priority: 255

     Hash mask length:30

     State: Elected

     Scope: Not scoped

     Uptime: 6d:05h

     Next BSR messagescheduled at: 00:00:06

     C-RP Count: 4

Candidate AdminScoped BSR Count: 0

Candidate BSR Address: 10.18.0.1

     Priority: 255

     Hash mask length:30

     State: Elected

     Scope: Not scoped

     Wait to be BSR: 0


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Popeye_Wang
Admin Created Jan 20, 2020 03:04:21

Hi Steelblue,

During the dynamic RP election, several routers are configured as Candidate-BootStrap Routers (C-BSRs) and Candidate-Rendezvous Points (C-RPs). A BSR is dynamically elected from C-BSRs. The BSR collects C-RP information and summarizes C-RP information into an RP-Set. The RP-Set is encapsulated in a Bootstrap message and advertised to all the routers in the PIM domain. Then, the C-RPs elect an RP based on a uniform election rule.

The priority in the display pim rp-info command output indicates the RP priority. A smaller value indicates a higher priority.

The priority in the display pim rp-info command output is the priority of the BSR. A larger value indicates a higher priority.

The default value of both priorities is 0, and the value ranges from 0 to 255.

Therefore, you can see that core 1 is elected as the BSR because the priority of the C-BSR is set to 255. And the C-RP priorities of the other three devices are greater than 0. Therefore, core 1 is also elected as the RP.

I hope this helps.

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Popeye_Wang
Popeye_Wang Admin Created Jan 20, 2020 03:04:21

Hi Steelblue,

During the dynamic RP election, several routers are configured as Candidate-BootStrap Routers (C-BSRs) and Candidate-Rendezvous Points (C-RPs). A BSR is dynamically elected from C-BSRs. The BSR collects C-RP information and summarizes C-RP information into an RP-Set. The RP-Set is encapsulated in a Bootstrap message and advertised to all the routers in the PIM domain. Then, the C-RPs elect an RP based on a uniform election rule.

The priority in the display pim rp-info command output indicates the RP priority. A smaller value indicates a higher priority.

The priority in the display pim rp-info command output is the priority of the BSR. A larger value indicates a higher priority.

The default value of both priorities is 0, and the value ranges from 0 to 255.

Therefore, you can see that core 1 is elected as the BSR because the priority of the C-BSR is set to 255. And the C-RP priorities of the other three devices are greater than 0. Therefore, core 1 is also elected as the RP.

I hope this helps.

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