问题描述：
请看这台接入交换机的配置帮分析一个故障的原因 [SX2_4FA#_48]display current-configuration # version 5.20.99, Release 1109 # sysname SX2_4FA#_48 # clock timezone beijing add 08:00:00 # domain default enable system # ipv6 # telnet server enable # loopback-detection enable # password-recovery enable # acl number 3333 rule 25 permit ip source 10.12.82.0 0.0.0.255 rule 31 permit ip source 10.66.0.60 0 rule 35 permit ip source 10.4.241.2 0 rule 50 deny ip # vlan 1 # vlan 2 description for-jierujiaohuanjiguanli # vlan 1471 # vlan 2001 description jiaowumenpai # vlan 4000 # domain system access-limit disable state active idle-cut disable self-service-url disable # user-group system group-attribute allow-guest # local-user admin password cipher $c$3$H7WLoOuWq3Ql8clEtzY8vRtDu3pD4JAv authorization-attribute level 3 service-type telnet # stp enable # interface NULL0 # interface Vlan-interface2 ip address 10.8.24.7 255.255.255.0 # interface Vlan-interface4000 ip address 10.100.1.46 255.255.255.0 # interface GigabitEthernet1/0/1 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/2 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/3 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/4 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/5 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/6 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/7 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/8 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/9 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/10 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/11 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/12 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/13 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/14 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/15 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/16 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/17 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/18 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/19 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/20 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/21 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/22 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/23 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/24 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/25 port access vlan 2001 loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/26 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/27 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/28 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/29 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/30 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/31 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/32 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/33 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/34 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/35 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/36 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/37 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/38 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/39 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/40 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/41 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/42 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/43 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/44 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/45 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/46 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/47 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/48 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/49 port link-type trunk undo port trunk permit vlan 1 port trunk permit vlan 1471 4000 # interface GigabitEthernet1/0/50 port link-type trunk undo port trunk permit vlan 1 port trunk permit vlan 1471 4000 # interface GigabitEthernet1/0/51 port link-type trunk undo port trunk permit vlan 1 port trunk permit vlan 2 2001 4000 loopback-detection enable loopback-detection control enable loopback-detection per-vlan enable # interface GigabitEthernet1/0/52 port link-type trunk undo port trunk permit vlan 1 port trunk permit vlan 2 1471 2001 4000 loopback-detection enable loopback-detection control enable loopback-detection per-vlan enable dhcp-snooping trust # dhcp-snooping # ip route-static 0.0.0.0 0.0.0.0 10.8.24.1 # undo info-center logfile enable # snmp-agent snmp-agent local-engineid 383030303633413236353133343837414441413244303930 snmp-agent community read gxlsxy snmp-agent community write gxlsxyh3c snmp-agent sys-info version all snmp-agent target-host trap address udp-domain 10.4.252.244 params securityname gxlsxy snmp-agent target-host trap address udp-domain 10.6.6.20 params securityname gxlsxy v2c # ntp-service unicast-server 10.4.192.15 # load xml-configuration # load tr069-configuration # user-interface aux 0 user-interface vty 0 4 authentication-mode scheme user-interface vty 5 15 # return 这个是一台接入交换机的配置，G1/0/52是对汇聚交换机的接口，G1/0/51是对下一级一台接入交换机的接口，不知道为什么，汇聚交换机对这台交换机放通vlan 1471的话，这台交换机就会掉线，不放通vlan 1471就正常在线，我已经把这台交换机接终端的vlan是1471的access口都shutdown了还是这样，这是为什么？
最佳答案
故障原因分析 & 修复方案
一、故障根因
-
全局环路检测已开启 设备配置了
loopback-detection enable，整机所有端口默认启用环路检测，且接入端口统一配置动作loopback-detection action shutdown，检测到环路后会直接关闭对应接口。 -
VLAN 1471 链路打通后形成检测环路
- 设备 1/0/1~1/0/48 均为
access vlan 1471，即便这些端口执行了shutdown，VLAN 1471 在交换机内部仍然存在； - 上行口 G1/0/52（对接汇聚）放行 VLAN 1471 后，该 VLAN 跨本交换机与汇聚打通；
- 交换机周期性发送环路检测报文，报文经上行口发往汇聚后折返，本设备收到自身发出的检测报文，判定VLAN 1471 存在二层环路。
-
保护动作触发导致断网 匹配到环路后，设备执行预设动作
shutdown，直接将上行端口关闭，最终整台交换机失去上联，表现为掉线。 -
不放通 VLAN 1471 则正常的原因 汇聚侧未放行 VLAN 1471 时，该 VLAN 仅隔离在本机内部，环路检测报文无法向外转发、折返，不会触发环路判定，设备及上联端口保持正常。
补充说明：仅 shutdown 下行接入端口无法解决问题，故障环路产生于本交换机与汇聚之间，和下行端口状态无关。
二、解决方案（三种可选，按场景选择）
方案一：仅关闭 VLAN 1471 的环路检测（推荐，保留其他 VLAN 防环能力）
system-view
# 开启基于VLAN的环路检测控制
loopback-detection per-vlan enable
# 单独关闭VLAN 1471的环路检测
undo loopback-detection enable vlan 1471
方案二：全局关闭环路检测（最简，企业常规组网首选）
stp enable（STP 二层防环），可直接停用环路检测，依靠 STP 实现全网防环：system-view
undo loopback-detection enable
方案三：修改环路检测触发动作（临时过渡，不建议长期使用）
system-view
# 检测到环路仅阻塞端口，不彻底shutdown
loopback-detection action block
三、操作验证步骤
- 执行上述任意一套配置；
- 汇聚交换机在对接端口放行 VLAN 1471；
- 查看端口状态：
display interface GigabitEthernet 1/0/52 brief，确认端口状态为Up； - 测试交换机管理地址、终端业务连通性，确认恢复正常。
请看这台接入交换机的配置帮分析一个故障的原因 [SX2_4FA#_48]display current-configuration # version 5.20.99, Release 1109 # sysname SX2_4FA#_48 # clock timezone beijing add 08:00:00 # domain default enable system # ipv6 # telnet server enable # loopback-detection enable # password-recovery enable # acl number 3333 rule 25 permit ip source 10.12.82.0 0.0.0.255 rule 31 permit ip source 10.66.0.60 0 rule 35 permit ip source 10.4.241.2 0 rule 50 deny ip # vlan 1 # vlan 2 description for-jierujiaohuanjiguanli # vlan 1471 # vlan 2001 description jiaowumenpai # vlan 4000 # domain system access-limit disable state active idle-cut disable self-service-url disable # user-group system group-attribute allow-guest # local-user admin password cipher $c$3$H7WLoOuWq3Ql8clEtzY8vRtDu3pD4JAv authorization-attribute level 3 service-type telnet # stp enable # interface NULL0 # interface Vlan-interface2 ip address 10.8.24.7 255.255.255.0 # interface Vlan-interface4000 ip address 10.100.1.46 255.255.255.0 # interface GigabitEthernet1/0/1 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/2 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/3 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/4 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/5 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/6 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/7 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/8 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/9 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/10 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/11 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/12 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/13 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/14 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/15 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/16 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/17 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/18 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/19 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/20 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/21 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/22 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/23 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/24 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/25 port access vlan 2001 loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/26 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/27 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/28 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/29 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/30 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/31 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/32 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/33 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/34 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/35 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/36 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/37 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/38 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/39 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/40 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/41 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/42 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/43 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/44 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/45 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/46 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/47 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/48 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/49 port link-type trunk undo port trunk permit vlan 1 port trunk permit vlan 1471 4000 # interface GigabitEthernet1/0/50 port link-type trunk undo port trunk permit vlan 1 port trunk permit vlan 1471 4000 # interface GigabitEthernet1/0/51 port link-type trunk undo port trunk permit vlan 1 port trunk permit vlan 2 2001 4000 loopback-detection enable loopback-detection control enable loopback-detection per-vlan enable # interface GigabitEthernet1/0/52 port link-type trunk undo port trunk permit vlan 1 port trunk permit vlan 2 1471 2001 4000 loopback-detection enable loopback-detection control enable loopback-detection per-vlan enable dhcp-snooping trust # dhcp-snooping # ip route-static 0.0.0.0 0.0.0.0 10.8.24.1 # undo info-center logfile enable # snmp-agent snmp-agent local-engineid 383030303633413236353133343837414441413244303930 snmp-agent community read gxlsxy snmp-agent community write gxlsxyh3c snmp-agent sys-info version all snmp-agent target-host trap address udp-domain 10.4.252.244 params securityname gxlsxy snmp-agent target-host trap address udp-domain 10.6.6.20 params securityname gxlsxy v2c # ntp-service unicast-server 10.4.192.15 # load xml-configuration # load tr069-configuration # user-interface aux 0 user-interface vty 0 4 authentication-mode scheme user-interface vty 5 15 # return 这个是一台接入交换机的配置，G1/0/52是对汇聚交换机的接口，G1/0/51是对下一级一台接入交换机的接口，不知道为什么，汇聚交换机对这台交换机放通vlan 1471的话，这台交换机就会掉线，不放通vlan 1471就正常在线，我已经把这台交换机接终端的vlan是1471的access口都shutdown了还是这样，这是为什么？
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请看这台接入交换机的配置帮分析一个故障的原因 [SX2_4FA#_48]display current-configuration # version 5.20.99, Release 1109 # sysname SX2_4FA#_48 # clock timezone beijing add 08:00:00 # domain default enable system # ipv6 # telnet server enable # loopback-detection enable # password-recovery enable # acl number 3333 rule 25 permit ip source 10.12.82.0 0.0.0.255 rule 31 permit ip source 10.66.0.60 0 rule 35 permit ip source 10.4.241.2 0 rule 50 deny ip # vlan 1 # vlan 2 description for-jierujiaohuanjiguanli # vlan 1471 # vlan 2001 description jiaowumenpai # vlan 4000 # domain system access-limit disable state active idle-cut disable self-service-url disable # user-group system group-attribute allow-guest # local-user admin password cipher $c$3$H7WLoOuWq3Ql8clEtzY8vRtDu3pD4JAv authorization-attribute level 3 service-type telnet # stp enable # interface NULL0 # interface Vlan-interface2 ip address 10.8.24.7 255.255.255.0 # interface Vlan-interface4000 ip address 10.100.1.46 255.255.255.0 # interface GigabitEthernet1/0/1 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/2 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/3 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/4 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/5 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/6 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/7 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/8 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/9 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/10 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/11 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/12 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/13 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/14 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/15 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/16 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/17 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/18 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/19 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/20 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/21 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/22 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/23 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/24 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/25 port access vlan 2001 loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/26 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/27 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/28 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/29 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/30 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/31 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/32 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/33 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/34 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/35 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/36 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/37 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/38 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/39 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/40 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/41 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/42 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/43 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/44 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/45 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/46 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/47 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/48 port access vlan 1471 shutdown loopback-detection enable loopback-detection action shutdown # interface GigabitEthernet1/0/49 port link-type trunk undo port trunk permit vlan 1 port trunk permit vlan 1471 4000 # interface GigabitEthernet1/0/50 port link-type trunk undo port trunk permit vlan 1 port trunk permit vlan 1471 4000 # interface GigabitEthernet1/0/51 port link-type trunk undo port trunk permit vlan 1 port trunk permit vlan 2 2001 4000 loopback-detection enable loopback-detection control enable loopback-detection per-vlan enable # interface GigabitEthernet1/0/52 port link-type trunk undo port trunk permit vlan 1 port trunk permit vlan 2 1471 2001 4000 loopback-detection enable loopback-detection control enable loopback-detection per-vlan enable dhcp-snooping trust # dhcp-snooping # ip route-static 0.0.0.0 0.0.0.0 10.8.24.1 # undo info-center logfile enable # snmp-agent snmp-agent local-engineid 383030303633413236353133343837414441413244303930 snmp-agent community read gxlsxy snmp-agent community write gxlsxyh3c snmp-agent sys-info version all snmp-agent target-host trap address udp-domain 10.4.252.244 params securityname gxlsxy snmp-agent target-host trap address udp-domain 10.6.6.20 params securityname gxlsxy v2c # ntp-service unicast-server 10.4.192.15 # load xml-configuration # load tr069-configuration # user-interface aux 0 user-interface vty 0 4 authentication-mode scheme user-interface vty 5 15 # return 这个是一台接入交换机的配置，G1/0/52是对汇聚交换机的接口，G1/0/51是对下一级一台接入交换机的接口，不知道为什么，汇聚交换机对这台交换机放通vlan 1471的话，这台交换机就会掉线，不放通vlan 1471就正常在线，我已经把这台交换机接终端的vlan是1471的access口都shutdown了还是这样，这是为什么？
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