Checking Statistics About Downstream Layer 3 IPv4 Multicast Packets
You can check statistics about downstream Layer 3 IPv4 multicast packets to diagnose multicast traffic faults on a device.
Context
If multicast traffic is discarded, you can check statistics about downstream Layer 3 IPv4 multicast packets and determine the device that discarded the traffic. Before checking statistics about downstream Layer 3 IPv4 multicast packets, enable a device to collect statistics about downstream Layer 3 IPv4 multicast packets. To enable a device to collect statistics about downstream Layer 3 IPv4 multicast packets based on a multicast source and group, run the multicast egress statistics command. To enable a device to collect statistics about downstream Layer 3 IPv4 multicast packets based on a slot, run the multicast egress statistics enable command. You can diagnose faults by clearing and checking statistics about downstream Layer 3 IPv4 multicast packets.
Procedure
- Run the system-view command to enter the system view.
- Run either of the following commands:
- To enable the device to collect statistics about downstream Layer 3 IPv4 multicast packets based on a multicast source and group, run the multicast egress statistics [ vpn-instance vpn-instance-name ] source-address group-address slot slot-id command.
- To enable the device to collect statistics about downstream Layer 3 IPv4 multicast packets based on a slot, run the multicast egress statistics enable slot slot-id command. This command is supported only by the admin VS.
- Run the commit command to commit the configuration.
- Run the display multicast egress statistics [ vpn-instance vpn-instance-name ] source-address group-address slot slot-id or display multicast egress statistics slot slot-id command to check statistics about downstream Layer 3 IPv4 multicast packets.
- During fault diagnosis, you may need to clear the existing statistics about downstream Layer 3 IPv4 multicast packets and then check the new statistics about downstream Layer 3 IPv4 multicast packets. To clear statistics about downstream Layer 3 IPv4 multicast packets, run the reset multicast egress statistics [ vpn-instance vpn-instance-name ] source-source group-address slot slot-id or reset multicast egress statistics slot slot-id all command. You can run the preceding commands repeatedly as required.
- The display multicast egress statistics slot slot-id and reset multicast egress statistics slot slot-id all commands are supported only by the admin VS.