S7700收到大量TC报文导致业务时断时续

发布时间:  2015-04-29 浏览次数:  176 下载次数:  0
问题描述

客户反馈最近S7700下面的用户会出现ping网关时断时续的状况

S7700-----H3C设备-----PC

告警信息

查看S7700上面告警:

Apr 27 2015 17:20:29+08:00 LN1_OP_DS_01 %%01MSTP/4/TC_GUARDED(l):CID=0x80542724;The instance received TC message exceeded the threshold will be deferred to deal with at the end of TC protection time. (InstanceID=0,bridgePriority=0)
Apr 27 2015 17:20:01+08:00 LN1_OP_DS_01 %%01MSTP/4/TC_GUARDED(l):CID=0x80542724;The instance received TC message exceeded the threshold will be deferred to deal with at the end of TC protection time. (InstanceID=0,bridgePriority=0)
Apr 27 2015 17:19:05+08:00 LN1_OP_DS_01 %%01MSTP/4/TC_GUARDED(l):CID=0x80542724;The instance received TC message exceeded the threshold will be deferred to deal with at the end of TC protection time. (InstanceID=0,bridgePriority=0)

H3C上面告警:

%Apr 27 17:20:23:800 2015 LN1_OP_AS_BY3 IFNET/3/LINK_UPDOWN: GigabitEthernet2/0/43 link status is DOWN.
%Apr 27 17:20:24:371 2015 LN1_OP_AS_BY3 IFNET/3/LINK_UPDOWN: GigabitEthernet2/0/43 link status is UP.
%Apr 27 17:20:40:918 2015 LN1_OP_AS_BY3 IFNET/3/LINK_UPDOWN: GigabitEthernet2/0/36 link status is DOWN.
%Apr 27 17:20:53:519 2015 LN1_OP_AS_BY3 MSTP/6/MSTP_FORWARDING: -Slot=2; Instance 0's port GigabitEthernet2/0/43 has been set to forwarding state.
%Apr 27 17:20:53:520 2015 LN1_OP_AS_BY3 MSTP/6/MSTP_DETECTED_TC: -Slot=2; Instance 0's port GigabitEthernet2/0/43 detected a topology change.
%Apr 27 17:20:59:447 2015 LN1_OP_AS_BY3 IFNET/3/LINK_UPDOWN: GigabitEthernet2/0/36 link status is UP.
%Apr 27 17:21:28:540 2015 LN1_OP_AS_BY3 MSTP/6/MSTP_FORWARDING: -Slot=2; Instance 0's port GigabitEthernet2/0/36 has been set to forwarding state.
%Apr 27 17:21:28:540 2015 LN1_OP_AS_BY3 MSTP/6/MSTP_DETECTED_TC: -Slot=2; Instance 0's port GigabitEthernet2/0/36 detected a topology change.
%Apr 27 17:21:59:674 2015 LN1_OP_AS_BY3 IFNET/3/LINK_UPDOWN: GigabitEthernet2/0/36 link status is DOWN.
%Apr 27 17:22:18:221 2015 LN1_OP_AS_BY3 IFNET/3/LINK_UPDOWN: GigabitEthernet2/0/36 link status is UP.
%Apr 27 17:22:41:175 2015 LN1_OP_AS_BY3 IFNET/3/LINK_UPDOWN: GigabitEthernet2/0/36 link status is DOWN.

处理过程

发现H3C跟S7700上面都有告警信息,S7700上面告警收到的TC报文太多。H3C上有tc改变的告警

查看文档

缺省情况下,设备在指定时间内处理拓扑变化报文的最大数量是1。

配置后,在stp tc-protection interval指定的时间内,设备只会处理stp tc-protection threshold指定数量的拓扑变化报文,对于其他的报文会延迟处理,所以可能会影响生成树的收敛速度。例如,时间设定为10秒,阈值设定为5,则设备收到拓扑变化报文后,在10秒内只会处理最开始收到的5个拓扑变化报文,对于后面收到的报文则会等10秒超时后再统一处理。

询问客户得知,客户有业务需求在H3C上频繁拔插终端导致H3C判定拓扑改变发送大量TC报文给S7700,S7700收到后由于TC保护机制。设备只会处理stp tc-protection threshold指定数量的拓扑变化报文,对于其他的报文会延迟处理。导致业务时断时续

根因
H3C发送大量TC报文导致S7700启用TC保护功能
解决方案
在H3C接终端的接口上配置边缘端口或者去使能STP

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