S9712 话机声音断断续续。

【故障现象】S9712 接话机，ip电话，话机声音断断续续。【版本/补丁】【问题初步定位】【当前进展】【当前方案】【下一步计划】【已采集信息】（日志、诊断、配置等）【客户态度】

设备收到了大量的STP TC报文，最近一次是从eth-trunk39收到的。

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===============display stp ===============

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-------[CIST Global Info][Mode MSTP]-------

CIST Bridge         :32768.xxxx-xxxx-xxxx

Config Times        :Hello 2s MaxAge 20s FwDly 15s MaxHop 20

Active Times        :Hello 2s MaxAge 20s FwDly 15s MaxHop 20

CIST Root/ERPC      :8192 .xxxx-xxxx-xxxx / 10000

CIST RegRoot/IRPC   :32768.xxxx-xxxx-xxxx / 0 (This bridge is the root)

CIST RootPortId     :128.691 (Eth-Trunk100)

BPDU-Protection     :Disabled

TC or TCN received  :2318797

TC count per hello  :0

STP Converge Mode   :Normal

Share region-configuration :Enabled

Time since last TC  :0 days 0h:0m:7s

Number of TC        :1521688

Last TC occurred    :Eth-Trunk39

设备频繁收到STP TC报文，会频繁的做ARP 老化探测，可能会出现arp丢包，最后arp被老化，造成丢包。

建议排查下STP TC报文的来源。可以使用下面的命令行排查，看下哪些端口收到的STP TC报文比较多

此外，S9700的2/8/0/11频繁震荡，建议排查链路

Sep 27 2021 14:10:51+08:00 9712 %%01IFPDT/4/IF_STATE(l)[714]:Interface XGigabitEthernet2/8/0/11 has turned into UP state.

Sep 27 2021 14:10:50+08:00 9712 %%01IFPDT/4/IF_STATE(l)[715]:Interface XGigabitEthernet2/8/0/11 has turned into DOWN state.

Sep 27 2021 14:10:46+08:00 9712 %%01IFPDT/4/IF_STATE(l)[716]:Interface XGigabitEthernet2/8/0/11 has turned into UP state.

Sep 27 2021 14:10:44+08:00 9712 %%01IFPDT/4/IF_STATE(l)[717]:Interface XGigabitEthernet2/8/0/11 has turned into DOWN state.

Sep 27 2021 14:10:43+08:00 9712 %%01IFPDT/4/IF_STATE(l)[718]:Interface XGigabitEthernet2/8/0/11 has turned into UP state.

Sep 27 2021 14:10:37+08:00 9712 %%01IFPDT/4/IF_STATE(l)[719]:Interface XGigabitEthernet2/8/0/11 has turned into DOWN state.

Sep 27 2021 14:10:36+08:00 9712  %%01IFPDT/4/IF_STATE(l)[720]:Interface XGigabitEthernet2/8/0/11 has turned into UP state.

设备频繁收到STP TC报文，会频繁的做ARP 老化探测，可能会出现arp丢包，最后arp被老化，造成丢包

在接口上配置边缘端口后，问题解决