交换机端口err-disable、配置速率和双工模式
实例:
和客户IDC机房拉了一条MSTP线路,接入到Cisco 3750x后端口灯不亮,更换了端口也是不亮,查看端口信息发现因为客户端有环路导致我们接口出现err-disable错误。
故障现象:
线路不通,物理指示灯不亮,有的会显示为橙色(不同平台指示灯状态不同)
解决思路:
取消环路,将端口重启
排错过程:
1、查看接口状态
GigabitEthernet1/0/8 is down, line protocol is down (err-disabled)
C3750X-5F-I02-2-252(config)#errdisable recovery cause ? all Enable timer to recover from all error causes arp-inspection Enable timer to recover from arp inspection error disable state bpduguard Enable timer to recover from BPDU Guard error channel-misconfig (STP) Enable timer to recover from channel misconfig error dhcp-rate-limit Enable timer to recover from dhcp-rate-limit error dtp-flap Enable timer to recover from dtp-flap error gbic-invalid Enable timer to recover from invalid GBIC error inline-power Enable timer to recover from inline-power error l2ptguard Enable timer to recover from l2protocol-tunnel error link-flap Enable timer to recover from link-flap error loopback Enable timer to recover from loopback error mac-limit Enable timer to recover from mac limit disable state pagp-flap Enable timer to recover from pagp-flap error port-mode-failure Enable timer to recover from port mode change failure pppoe-ia-rate-limit Enable timer to recover from PPPoE IA rate-limit error psecure-violation Enable timer to recover from psecure violation error security-violation Enable timer to recover from 802.1x violation error sfp-config-mismatch Enable timer to recover from SFP config mismatch error small-frame Enable timer to recover from small frame error storm-control Enable timer to recover from storm-control error udld Enable timer to recover from udld error vmps Enable timer to recover from vmps shutdown error C3750X-5F-I02-2-252(config)#errdisable recovery cause loopback[p]C3750X-5F-I02-2-252#show interfaces status Port Name Status Vlan Duplex Speed Type Gi1/0/1 "AA Network" connected routed a-half a-100 10/100/1000BaseTX Gi1/0/2 "BB Network connected routed a-full a-100 10/100/1000BaseTX Gi1/0/3 "CC Network" connected routed a-half a-100 10/100/1000BaseTX Gi1/0/4 "DD Network" connected routed a-half a-100 10/100/1000BaseTX Gi1/0/5 "EE Network" connected routed a-half a-100 10/100/1000BaseTX Gi1/0/6 "FF Network" connected routed a-half a-100 10/100/1000BaseTX Gi1/0/7 "GG Network connected routed a-half a-100 10/100/1000BaseTX Gi1/0/8 "HH Network" connected routed a-full a-100 10/100/1000BaseTX Gi1/0/9 err-disabled 1 auto auto 10/100/1000BaseTX Gi1/0/10 err-disabled 1 auto auto 10/100/1000BaseTX Gi1/0/11 notconnect 515 auto auto 10/100/1000BaseTX Gi1/0/12 connected 515 a-full a-1000 10/100/1000BaseTX Gi1/0/13 connected 514 a-full a-100 10/100/1000BaseTX Gi1/0/14 connected 514 a-full a-100 10/100/1000BaseTX Gi1/0/15 notconnect 513 auto auto 10/100/1000BaseTX Gi1/0/16 notconnect 513 auto auto 10/100/1000BaseTX Gi1/0/17 connected 502 a-full a-1000 10/100/1000BaseTX Gi1/0/18 connected 502 a-full a-1000 10/100/1000BaseTX Gi1/0/19 connected 502 a-full a-1000 10/100/1000BaseTX Gi1/0/20 err-disabled 502 auto auto 10/100/1000BaseTX Gi1/0/21 connected 515 a-full a-1000 10/100/1000BaseTX Gi1/0/22 connected 515 a-full a-1000 10/100/1000BaseTX Gi1/0/23 notconnect 1 auto auto 10/100/1000BaseTX Gi1/0/24 connected trunk a-full a-1000 10/100/1000BaseTX Fa0 notconnect routed auto auto 10/100BaseTX C3750X-5F-I02-2-252#[p]
配置接口速率和双工模式
接口双工模式分为全双工和半双工,指的是数据的传输方式:
1.半双工(Half Duplex)是指接口任意时刻只能接收数据或者发送数据,并存在最大传输距离的限制。
2.全双工(Full Duplex)是指在发送数据的同时也能够接收数据,两者同步进行,最大吞吐量可达到双倍速率,且消除了半双工的物理距离限制。目前的网卡一般都支持全双工。
配置接口双工模式
接口双工模式可以是自协商模式(auto)、半双工模式(half)、全双工模式(full)
自协商的内容包括两端接口的双工模式和接口速率。一旦协商通过,链路两端的设备就锁定在同样的双工模式和接 19f07 口速率。自协商功能只有在链路两端设备均支持才可以生效。如果对端设备不支持自协商功能,或者对端设备自协商机制和本端设备不一致,则接口可能会处于Down状态
如果数据流量较大,则链路两端的自协商结果只能为全双工模式,不能为半双工模式,否则会出现丢包现象。如果数据流量较小,链路两端的自协商结果为半双工模式即可以满足数据传输需求。
链路两端的双工模式必须保持一致。电接口对接时有可能因为两端接口自协商模式不一致等原因,造成接口被协商成半双工模式,此时可能会出现报文交互异常现象C3750X-5F-I02-2-252#SHOw INTERfaces GigabitEthernet1/0/8
GigabitEthernet1/0/8 is down, line protocol is down (err-disabled)
Hardware is Gigabit Ethernet, address is 00af.1fe0.63d0 (bia 00af.1fe0.63d0)
Description: "HTZQ Network"
Internet address is 165.16.241.174/30
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Auto-duplex, Auto-speed, media type is 10/100/1000BaseTX # auto | full | half设置端口为-自动/全双工/半双工
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 01:41:48, output 01:41:48, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
C3750X-5F-I02-2-252(config)#INTErface GigabitEthernet1/0/8
C3750X-5F-I02-2-252(config-if)# DUplex full
C3750X-5F-I02-2-252(config-if)# Speed 100
C3750X-5F-I02-2-252(config-if)#speed ?
10 Force 10 Mbps operation
100 Force 100 Mbps operation
1000 Force 1000 Mbps operation
auto Enable AUTO speed configuration
C3750X-5F-I02-2-252(config-if)#
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