The nqa bier ipv6 echo-reply disable command disables a device from responding to BIERv6 Echo Request packets.
The undo nqa bier ipv6 echo-reply disable command enables a device to respond to BIERv6 Echo Request packets.
By default, a device is enabled to respond to BIERv6 Echo Request packets.
Usage Scenario
To enable a device to support BIERv6 ping/tracert, run the undo nqa bier ipv6 echo-reply disable command. If this function is no longer required, run the nqa bier ipv6 echo-reply disable command to disable the device from responding to BIERv6 Echo Request packets, so that resources can be properly allocated and security can be improved. To disable the function of responding to BIERv6 Echo Request packets, disable the listening port. The default listening port is 4902, which can be changed using the nqa bier ipv6 udp-port command.
Configuration Impact
If you run the nqa bier ipv6 echo-reply disable command to disable the device from responding to BIERv6 Echo Request packets, running the ping bier ipv6 or tracert bier ipv6 command times out when the device functions as the ping or tracert destination.
Precautions
Running the undo nqa bier ipv6 echo-reply disable command is one of the prerequisites for enabling the listening port. Another prerequisite is that the BIERv6 configuration exists on the device. If either of the preceding conditions is not met, the listening port is disabled and does not respond to BIERv6 Echo Request packets.
After the ping bier ipv6 or tracert bier ipv6 command is run, you are advised to run the nqa bier ipv6 echo-reply disable command to disable the device from responding to BIERv6 Echo Request packets, preventing system resources from being occupied.