Networking
拔下 Netgear 交換機導致遠端交換機上的 Cisco 鏈路斷開
我有一個非常奇怪的問題，我希望有人能給我一個關於在哪裡看的想法。我有一個新的 Netgear M4100-D10-POE 第 2 層託管交換機，我們正在遠端建築物中安裝它。它通過 CAT5 電纜連接到外部網路的其餘部分到 Cisco 交換機（我們有幾個，它連接的位置似乎並不重要）。現在它工作正常，但是當我關閉這個 Netgear 交換機（或從網路上拔下它）時，我收到一堆來自各種服務的電子郵件，表明一對其他 Cisco 交換機（Catalyst 3560 和催化劑 2960S)。這些交換機通過光纖線相互連接。
奇怪的是，Netgear 交換機沒有直接連接到遭受鏈路故障的兩台交換機中的任何一台。兩者之間可能有 1 或 2 個其他 Cisco 交換機。我也沒有在任一交換機上看到任何排序埠向上/向下日誌消息。我也知道這不是巧合，因為我可以隨時通過插拔 Netgear 交換機來重現問題。
我唯一的猜測是它與 BGP、STP 或其他一些交換機到交換機協議有關，但我不知道如何監控它。
更新：這是配置文件。首先是網件交換機：
!Current Configuration: ! !System Description "M4100-D10-POE ProSafe 10-port FastEthernet L2+ Intelligent Edge PoE Desktop Managed Switch, 10.0.1.28, B1.0.0.9" !System Software Version "10.0.1.28" !System Up Time "2 days 23 hrs 58 mins 15 secs" !Additional Packages QOS,IPv6 Management,Routing !Current SNTP Synchronized Time: Mar 9 19:09:41 2015 UTC ! network protocol none network parms 172.16.112.68 255.255.240.0 172.16.112.4 vlan database vlan 3-10,200 vlan name 3 "VOIP_HD" vlan name 4 "CAMERA" vlan name 5 "WIFI_MGMT" vlan name 6 "WIFI_GUEST" vlan name 7 "WIFI_DATA" vlan name 8 "SAN_SATA" vlan name 9 "SAN_SAS" vlan name 10 "DMZ" vlan name 200 "AUTOVOIP" exit ip ssh server enable ip ssh protocol 2 no ip telnet server enable configure sntp server "172.16.112.6" sntp server "0.north-america.pool.ntp.org" 2 sntp server "1.north-america.pool.ntp.org" 3 time-range ip domain name "caymanport.com" ip name server 172.16.112.6 172.16.112.23 172.16.112.9 snmptrap "CIPAread" ipaddr 172.16.112.65 voice vlan no green-mode energy-detect line console no transport input telnet exit line telnet exit line ssh exit snmp-server sysname "CDCParts1Switch" snmp-server location "CDC Taylor Parts Container" snmp-server contact "IT Manager" ! no snmp-server community public no snmp-server community private auto-voip vlan 200 interface 0/7 vlan participation include 2-3 vlan tagging 2-3 exit interface 0/8 vlan participation include 2-3 vlan tagging 2-3 exit interface 0/9 vlan participation include 2-10 vlan tagging 1-10 exit interface 0/10 vlan participation include 2-10 vlan tagging 1-10 exit no isdp run no isdp advertise-v2 exit現在的 Cisco 3560 交換機（CDCVOIPSwitch）：
Current configuration : 19392 bytes ! ! Last configuration change at 11:31:57 EST Fri Mar 6 2015 ! NVRAM config last updated at 15:35:31 EST Tue Mar 3 2015 ! version 12.2 no service pad service timestamps debug uptime service timestamps log datetime service password-encryption service sequence-numbers ! hostname CDCVoipSwitch ! boot-start-marker boot-end-marker ! aaa new-model ! aaa session-id common clock timezone EST -5 system mtu routing 1500 ip routing ip domain-name caymanport.com ip name-server 172.16.112.6 ip name-server 172.16.112.23 ip name-server 172.16.112.9 ! mls qos map cos-dscp 0 8 16 26 32 46 48 56 mls qos srr-queue input bandwidth 90 10 mls qos srr-queue input threshold 1 8 16 mls qos srr-queue input threshold 2 34 66 mls qos srr-queue input buffers 67 33 mls qos srr-queue input cos-map queue 1 threshold 2 1 mls qos srr-queue input cos-map queue 1 threshold 3 0 mls qos srr-queue input cos-map queue 2 threshold 1 2 mls qos srr-queue input cos-map queue 2 threshold 2 4 6 7 mls qos srr-queue input cos-map queue 2 threshold 3 3 5 mls qos srr-queue input dscp-map queue 1 threshold 2 9 10 11 12 13 14 15 mls qos srr-queue input dscp-map queue 1 threshold 3 0 1 2 3 4 5 6 7 mls qos srr-queue input dscp-map queue 1 threshold 3 32 mls qos srr-queue input dscp-map queue 2 threshold 1 16 17 18 19 20 21 22 23 mls qos srr-queue input dscp-map queue 2 threshold 2 33 34 35 36 37 38 39 48 mls qos srr-queue input dscp-map queue 2 threshold 2 49 50 51 52 53 54 55 56 mls qos srr-queue input dscp-map queue 2 threshold 2 57 58 59 60 61 62 63 mls qos srr-queue input dscp-map queue 2 threshold 3 24 25 26 27 28 29 30 31 mls qos srr-queue input dscp-map queue 2 threshold 3 40 41 42 43 44 45 46 47 mls qos srr-queue output cos-map queue 1 threshold 3 5 mls qos srr-queue output cos-map queue 2 threshold 3 3 6 7 mls qos srr-queue output cos-map queue 3 threshold 3 2 4 mls qos srr-queue output cos-map queue 4 threshold 2 1 mls qos srr-queue output cos-map queue 4 threshold 3 0 mls qos srr-queue output dscp-map queue 1 threshold 3 40 41 42 43 44 45 46 47 mls qos srr-queue output dscp-map queue 2 threshold 3 24 25 26 27 28 29 30 31 mls qos srr-queue output dscp-map queue 2 threshold 3 48 49 50 51 52 53 54 55 mls qos srr-queue output dscp-map queue 2 threshold 3 56 57 58 59 60 61 62 63 mls qos srr-queue output dscp-map queue 3 threshold 3 16 17 18 19 20 21 22 23 mls qos srr-queue output dscp-map queue 3 threshold 3 32 33 34 35 36 37 38 39 mls qos srr-queue output dscp-map queue 4 threshold 1 8 mls qos srr-queue output dscp-map queue 4 threshold 2 9 10 11 12 13 14 15 mls qos srr-queue output dscp-map queue 4 threshold 3 0 1 2 3 4 5 6 7 mls qos queue-set output 1 threshold 1 138 138 92 138 mls qos queue-set output 1 threshold 2 138 138 92 400 mls qos queue-set output 1 threshold 3 36 77 100 318 mls qos queue-set output 1 threshold 4 20 50 67 400 mls qos queue-set output 2 threshold 1 149 149 100 149 mls qos queue-set output 2 threshold 2 118 118 100 235 mls qos queue-set output 2 threshold 3 41 68 100 272 mls qos queue-set output 2 threshold 4 42 72 100 242 mls qos queue-set output 1 buffers 10 10 26 54 mls qos queue-set output 2 buffers 16 6 17 61 mls qos ! crypto pki trustpoint HTTPS_SS_CERT_KEYPAIR enrollment selfsigned serial-number revocation-check none rsakeypair HTTPS_SS_CERT_KEYPAIR ! spanning-tree mode pvst spanning-tree extend system-id ! vlan internal allocation policy ascending ! ip ssh time-out 60 ip ssh authentication-retries 2 ! interface FastEthernet0/1 switchport mode access switchport voice vlan 2 switchport port-security aging type inactivity srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone macro description cisco-phone spanning-tree portfast spanning-tree bpduguard enable ! interface FastEthernet0/2 switchport mode access switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/3 description vip5312-3752 switchport mode access switchport voice vlan 2 switchport port-security aging type inactivity srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone macro description cisco-phone spanning-tree portfast spanning-tree bpduguard enable ! interface FastEthernet0/4 switchport mode access switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/5 description vip5330-3757 switchport mode access switchport voice vlan 2 switchport port-security aging type inactivity srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone macro description cisco-phone spanning-tree portfast spanning-tree bpduguard enable ! interface FastEthernet0/6 switchport mode access switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/7 description vip5330-3756 switchport mode access switchport voice vlan 2 switchport port-security aging type inactivity srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone macro description cisco-phone spanning-tree portfast spanning-tree bpduguard enable ! interface FastEthernet0/8 description vip5312-3759 switchport mode access switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/9 description vip5330-3755 switchport mode access switchport voice vlan 2 switchport port-security aging type inactivity srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone macro description cisco-phone spanning-tree portfast spanning-tree bpduguard enable ! interface FastEthernet0/10 switchport mode access switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/11 description vip5312-3758 switchport mode access switchport voice vlan 2 switchport port-security aging type inactivity srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone macro description cisco-phone spanning-tree portfast spanning-tree bpduguard enable ! interface FastEthernet0/12 switchport mode access switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/13 description vip5330-3754 switchport mode access switchport voice vlan 2 switchport port-security aging type inactivity srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone macro description cisco-phone spanning-tree portfast spanning-tree bpduguard enable ! interface FastEthernet0/14 switchport mode access switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/15 description vip5312-3732 switchport mode access switchport voice vlan 2 switchport port-security aging type inactivity srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone macro description cisco-phone spanning-tree portfast spanning-tree bpduguard enable ! interface FastEthernet0/16 description camCDCNetRm switchport mode access switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/17 description vip5312-3751 switchport mode access switchport voice vlan 2 switchport port-security aging type inactivity srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone macro description cisco-phone spanning-tree portfast spanning-tree bpduguard enable ! interface FastEthernet0/18 description vip5312-3760 switchport mode access switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/19 description vip5312-3750 switchport mode access switchport voice vlan 2 switchport port-security aging type inactivity srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone macro description cisco-phone spanning-tree portfast spanning-tree bpduguard enable ! interface FastEthernet0/20 switchport mode access switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/21 description vip5312-3761 switchport mode access switchport voice vlan 2 switchport port-security aging type inactivity srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone macro description cisco-phone spanning-tree portfast spanning-tree bpduguard enable ! interface FastEthernet0/22 switchport mode access switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/23 description vip5312-3762 switchport mode access switchport voice vlan 2 switchport port-security aging type inactivity srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone macro description cisco-phone spanning-tree portfast spanning-tree bpduguard enable ! interface FastEthernet0/24 switchport mode access switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/25 description vip5312-3763 switchport mode access switchport voice vlan 2 switchport port-security aging type inactivity srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone macro description cisco-phone spanning-tree portfast spanning-tree bpduguard enable ! interface FastEthernet0/26 switchport mode access switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/27 description vip5312-3764 switchport mode access switchport voice vlan 2 switchport port-security aging type inactivity srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone macro description cisco-phone spanning-tree portfast spanning-tree bpduguard enable ! interface FastEthernet0/28 description AP.Ware.Out.Corner switchport trunk encapsulation dot1q switchport trunk native vlan 5 switchport mode trunk switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/29 description vip5312-3765 switchport mode access switchport voice vlan 2 switchport port-security aging type inactivity srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone macro description cisco-phone spanning-tree portfast spanning-tree bpduguard enable ! interface FastEthernet0/30 description AP.Ware.Out.Center switchport trunk encapsulation dot1q switchport trunk native vlan 5 switchport mode trunk switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/31 description vip5312-3766 switchport mode access switchport voice vlan 2 switchport port-security aging type inactivity srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone macro description cisco-phone spanning-tree portfast spanning-tree bpduguard enable ! interface FastEthernet0/32 description WLC Port 2 (VL06) switchport access vlan 6 switchport mode access spanning-tree portfast ! interface FastEthernet0/33 description WLC Port 3 (VL07) switchport access vlan 7 switchport mode access spanning-tree portfast ! interface FastEthernet0/34 switchport mode access spanning-tree portfast ! interface FastEthernet0/35 description vip5312-3753 switchport mode access switchport voice vlan 2 switchport port-security aging type inactivity srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone macro description cisco-phone spanning-tree portfast spanning-tree bpduguard enable ! interface FastEthernet0/36 description AP.Mech switchport trunk encapsulation dot1q switchport trunk native vlan 5 switchport mode trunk spanning-tree portfast ! interface FastEthernet0/37 description vip5312-3610 switchport mode access switchport voice vlan 2 switchport port-security aging type inactivity srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone macro description cisco-phone spanning-tree portfast spanning-tree bpduguard enable ! interface FastEthernet0/38 switchport mode access spanning-tree portfast ! interface FastEthernet0/39 description WLC Port 4 switchport mode access spanning-tree portfast ! interface FastEthernet0/40 description WLC Port 1 (VL05) switchport trunk encapsulation dot1q switchport trunk native vlan 5 switchport mode trunk spanning-tree portfast ! interface FastEthernet0/41 description AP.Warehouse02 switchport trunk encapsulation dot1q switchport trunk native vlan 5 switchport mode trunk switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/42 description AP.Warehouse03 switchport trunk encapsulation dot1q switchport trunk native vlan 5 switchport mode trunk switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/43 description AP.Warehouse01 switchport trunk encapsulation dot1q switchport trunk native vlan 5 switchport mode trunk switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/44 description AP.CDC.Dwnstairs switchport trunk encapsulation dot1q switchport trunk native vlan 5 switchport mode trunk switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/45 description AP.CDC.Upstairs switchport trunk encapsulation dot1q switchport trunk native vlan 5 switchport mode trunk switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/46 description AP.CDCGuard switchport trunk encapsulation dot1q switchport trunk native vlan 5 switchport mode trunk switchport voice vlan 2 spanning-tree portfast ! interface FastEthernet0/47 description CDC-3300 switchport access vlan 2 switchport mode access spanning-tree portfast ! interface FastEthernet0/48 spanning-tree portfast ! interface GigabitEthernet0/1 description HDServerSwitch SM- switchport trunk encapsulation dot1q switchport mode trunk srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 queue-set 2 mls qos trust cos auto qos voip trust macro description cisco-switch spanning-tree link-type point-to-point ! interface GigabitEthernet0/2 description BillingVoipSwitch switchport trunk encapsulation dot1q switchport mode trunk srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 queue-set 2 mls qos trust cos auto qos voip trust macro description cisco-switch spanning-tree link-type point-to-point ! interface GigabitEthernet0/3 description CDCDelivSwitch MM Fiber switchport trunk encapsulation dot1q switchport mode trunk ! interface GigabitEthernet0/4 description CDCSwitch MM Fiber switchport trunk encapsulation dot1q switchport mode trunk srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 queue-set 2 mls qos trust cos auto qos voip trust macro description cisco-switch spanning-tree link-type point-to-point ! interface Vlan1 ip address 172.16.116.2 255.255.240.0 ! interface Vlan2 ip address 172.16.129.4 255.255.255.0 ! interface Vlan3 ip address 172.16.130.4 255.255.255.0 ! ip classless ip route 0.0.0.0 0.0.0.0 172.16.112.1 ip http server ip http secure-server ! line con 0 line vty 0 4 length 0 transport input ssh line vty 5 15 transport input ssh ! ntp clock-period 36029198 ntp server 172.16.112.6 key 0 prefer ntp server 169.229.70.95 key 0 prefer end接下來是 2960 交換機（HDServerSwitch）：
Current configuration : 7496 bytes ! ! Last configuration change at 15:32:04 UTC Mon Apr 7 2014 by admin ! NVRAM config last updated at 15:35:13 UTC Tue Mar 3 2015 ! version 12.2 no service pad service timestamps debug datetime msec service timestamps log datetime msec service password-encryption service sequence-numbers ! hostname HDServerSwitch ! boot-start-marker boot-end-marker ! aaa new-model ! aaa session-id common clock timezone UTC -5 0 ! ip domain-name caymanport.com ip name-server 172.16.112.6 ip name-server 172.16.112.23 ip name-server 172.16.112.9 udld aggressive ! mls qos srr-queue output cos-map queue 1 threshold 3 5 mls qos srr-queue output cos-map queue 2 threshold 3 3 6 7 mls qos srr-queue output cos-map queue 3 threshold 3 2 4 mls qos srr-queue output cos-map queue 4 threshold 2 1 mls qos srr-queue output cos-map queue 4 threshold 3 0 mls qos ! crypto pki trustpoint TP-self-signed-1538847872 enrollment selfsigned subject-name cn=IOS-Self-Signed-Certificate-1538847872 revocation-check none rsakeypair TP-self-signed-1538847872 ! spanning-tree mode rapid-pvst spanning-tree loopguard default spanning-tree extend system-id ! errdisable recovery cause link-flap errdisable recovery interval 60 ! vlan internal allocation policy ascending ! ip ssh time-out 60 ip ssh authentication-retries 2 ! macro global description cisco-global ! interface Port-channel1 description RumPoint LACP Team spanning-tree portfast ! interface FastEthernet0 no ip address ! interface GigabitEthernet0/1 description VsxHD01-4 switchport mode trunk spanning-tree portfast ! interface GigabitEthernet0/2 description VsxHD02-6 switchport mode trunk spanning-tree portfast ! interface GigabitEthernet0/3 description VsxHD01-5 switchport mode trunk spanning-tree portfast ! interface GigabitEthernet0/4 description VsxHD02-0 switchport mode trunk spanning-tree portfast ! interface GigabitEthernet0/5 description VsxHD01-3 switchport mode trunk spanning-tree portfast ! interface GigabitEthernet0/6 description VsxHD02-5 switchport mode trunk spanning-tree portfast ! interface GigabitEthernet0/7 description VsxHD01-2 switchport mode trunk spanning-tree portfast ! interface GigabitEthernet0/8 description VsxHD02-4 switchport mode trunk spanning-tree portfast ! interface GigabitEthernet0/9 description RumPoint-1 spanning-tree portfast channel-protocol lacp ! interface GigabitEthernet0/10 description VsxHD02-3 (VL10) switchport access vlan 10 switchport mode access spanning-tree portfast ! interface GigabitEthernet0/11 description RumPoint-2 spanning-tree portfast ! interface GigabitEthernet0/12 description VsxHD02-7 (VL10) switchport access vlan 10 switchport mode access spanning-tree portfast ! interface GigabitEthernet0/13 spanning-tree portfast ! interface GigabitEthernet0/14 description VsxHD02-1 switchport mode trunk spanning-tree portfast ! interface GigabitEthernet0/15 spanning-tree portfast ! interface GigabitEthernet0/16 description VsxHD02-2 switchport mode trunk spanning-tree portfast ! interface GigabitEthernet0/17 spanning-tree portfast ! interface GigabitEthernet0/18 description VsxHD02ILO switchport mode trunk spanning-tree portfast ! interface GigabitEthernet0/19 spanning-tree portfast ! interface GigabitEthernet0/20 spanning-tree portfast ! interface GigabitEthernet0/21 spanning-tree portfast ! interface GigabitEthernet0/22 spanning-tree portfast ! interface GigabitEthernet0/23 spanning-tree portfast ! interface GigabitEthernet0/24 description KVMHD spanning-tree portfast ! interface GigabitEthernet0/25 description CDCVoipSwitch SM-F switchport mode trunk mls qos trust cos macro description cisco-switch spanning-tree link-type point-to-point spanning-tree guard none ! interface GigabitEthernet0/26 description HDSwitch CAT5 switchport mode trunk shutdown mls qos trust cos macro description cisco-switch spanning-tree link-type point-to-point ! interface Vlan1 ip address 172.16.112.57 255.255.240.0 ! interface Vlan10 ip address 172.16.200.57 255.255.255.0 ! ip default-gateway 172.16.112.1 ip http server ip http secure-server ! logging esm config logging history size 500 logging history informational ! line con 0 line vty 0 4 transport input ssh line vty 5 15 transport input ssh ! ntp server 172.16.112.6 prefer ntp server 169.229.70.95 prefer end您可以在此處查看網路的拓撲：http: //imgur.com/1CvaqUt
Netgear 交換機現在連接到 CDCSwitch 埠 30（儘管它曾經連接到 BillingSwitch）。這是該埠的配置：
interface FastEthernet0/30 description CDCParts1Switch switchport trunk encapsulation dot1q switchport mode trunk spanning-tree link-type point-to-point !CDCVOIPSwitch 和 HDServerSwitch 之間的連結正在下降。
我不是 STP 專家，但我會對此有所了解。
根據 STP 拓撲更改期間發生的情況，對我來說，短暫的連接失去聽起來像是預期的行為。
當 STP 拓撲發生變化時（由於交換機埠轉換為阻塞或轉發狀態，因為交換機或上行鏈路被添加、刪除或失敗），由於目標 MAC 地址可通過一條不再存在的道路。這種情況一直持續到 STP 收斂並且 MAC 地址表過期，在 STP 拓撲更改的情況下，這會從預設的 300 秒減少到 15 秒。由於 MAC 地址表過期，幀也將通過交換基礎設施氾濫。
再說一次，您所經歷的聽起來像是預期的行為。