H3C交换机经常出现时短时通现象（汇聚5516（共四台）下接3050/3026两款）

汇聚5516（共四台）下接3050/3026两款,正常运行一段时间后，出现网络时断时通。这中故障已出现三次。重新启动这四台汇聚5516后，网络恢复正常。
  ?  D/ g; E0 [; k查看汇聚5516的LOGBUFFER日志。
# T: v5 C8 P" A8 \7 G%Aug 15 17:11:25 2008 E-5516-3 RSTP/2/PFWD:GigabitEthernet2/4 has been
! F0 A% U( C/ `) Y/ N% L1 c
6 |2 v( I* Y0 K/ Xset to forwarding state!
/ r! e$ S5 w3 V0 P%Aug 15 17:11:54 2008 E-5516-3 RSTP/2/PFWD:GigabitEthernet1/1 has been
/ v  o0 r1 |- B& i7 j; ]  ^# f
set to forwarding state!
5 K$ y' K( a" B3 |1 E%Aug 15 17:11:54 2008 -E-5516-3 RSTP/2/PFWD:GigabitEthernet2/2 has

6 z" D: z; D& I) C2 `- ~been set to forwarding state!
" W5 T4 k* x! M  O( Z: D! z# J%Aug 15 17:11:54 2008 E-5516-3 RSTP/2/PFWD:GigabitEthernet2/3 has been

. P- J# r, g% u7 w; V6 H* {set to forwarding state!
%Aug 17 00:25:53 2008 E-5516-3 RSTP/2/PDISC:GigabitEthernet2/2 has
. j( o1 }1 ~. f
  p+ h4 P1 A3 R0 |3 Q( ?) |% gbeen set to discarding state!
3 h. K5 w, V+ _+ g- B) l( U
# O8 D1 O" p3 Q5 j请帮忙分析以下是什么原因呢？

网络拓扑是怎么样的？只看出生成树端口状态在转变

需要再提供些详细的信息，才能分析分析