Checking BIERv6 Network Path Information Using Tracert

On a BIERv6 network, tracert can be used to locate faults.

Prerequisites

Before using the tracert bier ipv6 command to check the connectivity of a BIERv6 network, ensure that a BIERv6 tunnel has been correctly configured.

Procedure

Run the tracert bier ipv6 sub-domain subDomainId bsl { 64 | 128 | 256 } { bfr-id bfrID | bfr-id-start bfrIdStartVal bfr-id-end bfrIdEndVal } [ -a source-ip-address | -f first-ttl-val | -m max-ttl-val | -w timeout | udp-port dstPort6 | entropy entropy-val ] ^* command to discover the gateways through which packets to the destination BIERv6 device passes and locate the failure point on the BIERv6 network.
The following is an example:
```
<HUAWEI> tracert bier ipv6 sub-domain 1 bsl 64 bfr-id 152
  Tracert BIER IPv6: Subdomain ID: 1, BSL: 64, BFRID: 152, press CTRL_C to break
  TTL     Replier(BFR-ID)                                   Time      Type
  0                                                                   Ingress
  1       2001:DB8:1::1(152)                                516 ms    Egress
```
(Optional) Run the following commands to configure functions related to BIERv6 Echo Request packets.
- Run the system-view command to enter the system view.
- Run the nqa bier ipv6 receive rate-limit bierCpuLimit6 command to limit the rate at which BIERv6 Echo Request messages are sent to the main control board.
- Run the nqa bier ipv6 udp-port udpPort6 command to set the UDP port number for receiving BIERv6 Echo Request packets.
- Run the nqa bier ipv6 echo-reply disable command to disable the function of responding to BIERv6 Echo Request packets.