Networking
插入 SFP 後,Cisco 3850 所有埠都變為琥珀色
我們用 WS-C3850-24T(堆疊模式下的數量:2)替換了舊的 3750 交換機。每當我插入任何 SFP 模組來連接我們的不同部門時,所有埠都會變成琥珀色幾秒鐘,在此階段,其他埠的所有連接都會斷開,幾秒鐘後所有埠都會恢復綠色並恢復連接。這在舊的 3750 交換機中從未發生過。可能的原因是什麼?
以下是 STP 詳細資訊。
xxx-NOC-3850-Cluster#show spanning-tree summary Switch is in rapid-pvst mode Root bridge for: none Extended system ID is enabled Portfast Default is disabled PortFast BPDU Guard Default is disabled Portfast BPDU Filter Default is disabled Loopguard Default is disabled EtherChannel misconfig guard is enabled UplinkFast is disabled BackboneFast is disabled Configured Pathcost method used is short Name Blocking Listening Learning Forwarding STP Active ---------------------- -------- --------- -------- ---------- ---------- VLAN0001 0 0 0 28 28 ---------------------- -------- --------- -------- ---------- ---------- 1 vlan 0 0 0 28 28
以下是庫存輸出:
XXX-NOC-3850-Cluster#sh inv NAME: "c38xx Stack", DESCR: "c38xx Stack" PID: WS-C3850-24T , VID: V07 , SN: FOC2126L0T1 NAME: "Switch 1", DESCR: "WS-C3850-24T-S" PID: WS-C3850-24T-S , VID: V07 , SN: FOC2126L0T1 NAME: "StackPort1/1", DESCR: "StackPort1/1" PID: STACK-T1-50CM , VID: V01 , SN: MOC2102A2VN NAME: "Switch 1 - Power Supply B", DESCR: "Switch 1 - Power Supply B" PID: PWR-C1-350WAC , VID: V02 , SN: LIT20462TNP NAME: "Switch 1 FRU Uplink Module 1", DESCR: "4x1G Uplink Module" PID: C3850-NM-4-1G , VID: V01 , SN: FOC21083GDN NAME: "GigabitEthernet1/1/1", DESCR: "1000BaseSX SFP" PID: , VID: , SN: FNS12060A5K NAME: "GigabitEthernet1/1/4", DESCR: "1000BaseSX SFP" PID: , VID: , SN: FNS17041183 NAME: "Switch 2", DESCR: "WS-C3850-24T-S" PID: WS-C3850-24T-S , VID: V07 , SN: FCW2113C1AK NAME: "StackPort2/1", DESCR: "StackPort2/1" PID: STACK-T1-50CM , VID: V01 , SN: MOC2102A2VN NAME: "Switch 2 - Power Supply B", DESCR: "Switch 2 - Power Supply B" PID: PWR-C1-350WAC , VID: V02 , SN: ART2205FCLN NAME: "Switch 2 FRU Uplink Module 1", DESCR: "4x1G Uplink Module" PID: C3850-NM-4-1G , VID: V01 , SN: FOC21065HC4 NAME: "GigabitEthernet2/1/1", DESCR: "1000BaseSX SFP" PID: , VID: , SN: FNS17041321 NAME: "GigabitEthernet2/1/4", DESCR: "1000BaseSX SFP" PID: , VID: , SN: FNS17041205
如果您的使用者埠未處於 portfast 模式(預設情況下,如 所示
Portfast Default is disabled
,或每個埠),那麼當生成樹收斂時,您將遇到中斷。建議使用者埠設置如下,以盡量減少對 STP 的影響:
switchport mode access switchport access vlan ### spanning-tree portfast
如果您不想
spanning-tree portfast
在每個介面上鍵入,則可以spanning-tree portfast default
在全域配置模式下將所有訪問埠設置為 portfast 模式。也不建議使用 Vlan 1,因為它通常未被標記,並且被 Cisco 用於值得與使用者流量分開的網路管理功能。