3Com MSR 50 Series, Руководство по настройке

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1208 C
HAPTER
71: PIM C
ONFIGURATION
3
Check the configuration of static RPs. Use the display pim rp-info command to
check whether the same static RP address has been configured on all the routers in
the entire network.
No Unicast Route
Between BSR and C-RPs
in PIM-SM
Symptom
C-RPs cannot unicast advertise messages to the BSR. The BSR does not advertise
bootstrap messages containing C-RP information and has no unicast route to any
C-RP. An RPT cannot be established correctly, or the DR cannot perform source
register with the RP.
Analysis
■
The C-RPs periodically sends C-RP-Adv messages to the BSR by unicast. If a
C-RP has no unicast route to the BSR, the BSR cannot receive C-RP-Adv
messages from that C-RP and the bootstrap message of the BSR will not
contain the information of that C-RP.
■
In addition, if the BSR does not have a unicast router to a C-RP, it will discard
the C-RP-Adv messages from that C-RP, and therefore the bootstrap messages
of the BSR will not contain the information of that C-RP.
■
The RP is the core of a PIM-SM domain. Make sure that the RP information on
all routers is exactly the same, a specific group G is mapped to the same RP,
and unicast routes are available to the RP.
Solution
1
Check whether routes to C-RPs, the RP and the BSR are available. Carry out the
display ip routing-table command to check whether routes are available on
each router to the RP and the BSR, and whether a route is available between the
RP and the BSR. Make sure that each C-RP has a unicast route to the BSR, the BSR
has a unicast route to each C-RP, and all the routers in the entire network have a
unicast route to the RP.
2
Check the RP and BSR information. PIM-SM needs the support of the RP and BSR.
Use the
display pim bsr-info command to check whether the BSR information is
available on each router, and then use the display pim rp-info command to
check whether the RP information is correct.
3
View PIM neighboring relationships. Use the display pim neighbor command to
check whether the normal PIM neighboring relationships have been established
among the routers.