57
Neighbor Port Expires Option Flags
10.1.1.1 GE1/0/1 02:02:23 LAN Prune Delay
10.1.1.2 GE1/0/2 03:00:05 LAN Prune Delay
10.1.1.3 GE1/0/3 02:22:13 LAN Prune Delay
10.1.1.4 GE1/0/4 03:07:22 LAN Prune Delay
The output shows that Router A, Router B, Router C, and Router D are PIM snooping neighbors.
# On Switch A, display the PIM snooping routing information of VLAN 100.
[SwitchA] display pim-snooping routing-table vlan 100 slot 1
Total 2 entry(ies)
FSM Flag: NI-no info, J-join, PP-prune pending
VLAN ID: 100
Total 2 entry(ies)
(*, 224.1.1.1)
Upstream neighbor: 10.1.1.1
Upstream port: GE1/0/1
Total number of downstream ports: 1
1: GE1/0/3
Expires: 00:03:01, FSM: J
(*, 225.1.1.1)
Upstream neighbor: 10.1.1.2
Upstream port: GE1/0/2
Total number of downstream ports: 1
1: GE1/0/4
Expires: 00:03:11, FSM: J
The output shows that Switch A will forward the multicast data intended for multicast group 224.1.1.1
to only Router C, and forward the multicast data intended for multicast group 225.1.1.1 to only
Router D.
Troubleshooting PIM snooping
This section describes details about troubleshooting PIM snooping.
PIM snooping does not work
Symptom
PIM snooping does not work.
Analysis
IGMP snooping or PIM snooping is not enabled.
Solution
1.
Use the
display current-configuration
command to verify the status of IGMP snooping and
PIM snooping.
2.
If IGMP snooping is not enabled, enter system view and use the
igmp-snooping
command to
enable IGMP snooping globally. Then, enter VLAN view and use the
igmp-snooping enable
and
pim-snooping enable
commands to enable IGMP snooping and PIM snooping for the
VLAN.
