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16.4.4.1.7 debug ip pim bsr
Command: debug ip pim bsr
Function: Enable the PIM candidate RP/BSR informaiton debug function; the “no” format
of the command disables this debug function.
Parameter: N/A.
Default: Disabled.
Command mode: Admin Mode
Usage Guide: If detailed information about PIM candidate RP/BSR packets, etc. is
required, this debug command can be used.
Example:
Switch # debug ip pim bsr
PIM BSR debug is on
00: 16: 23: PIM: Received v2 BSR on Vlan4 from 192.4.1.3
00: 16: 23: PIM: Receive BSR fragtag 6879, hmlen: 30, pri: 192
00: 16: 23: PIM: Receive BSR Group (225.0.0.1, 0.0.0.0): rpcount: 1, fragcount: 1
00: 16: 23: PIM: C-RP 192.2.1.1, holdtime 130, C-RP pri 192
00: 16: 23: PIM: Transmit the BSR message on Vlan2
00: 16: 23: PIM: Transmit the BSR message on vlan4
00: 16: 23: PIM: Transmit the BSR message on vlan3
00: 16: 23: PIM: Transmit the BSR message on vlan2
16.4.4.2 PIM-SM Troubleshooting Help
In configuring and using PIM-SM protocol, the PIM-SM protocol may fail to run properly
due to reasons such as physical connection failure or wrong configurations. The user
should ensure the following:
Good condition of the physical connection.
All interface and link protocols are in the UP state (use “show interfaces status”
command).
Multicast protocols use unicast routes to perform RPF check, for this reason, the
unicast route correctness must be ensured.
PIM-SM protocol requires the support of RP and BSR. So “show ip pim bsr-router”
command should be run first for BRS information, if no BSR exists, then unicast route
to BSR should be checked.
Use the “show ip pim rp” command to verify RP information is correct. If no RP
information is displayed, unicast route should be checked, too.