具有自动协商的快速以太网路由器与千兆以太网交换机的双工失配
具有自动协商的快速以太网路由器与千兆以太网交换机的双工失配
提问于 2019-04-16 17:24:08
我正在连接快速以太网0/0接口上的c3745路由器与千兆以太网0/1上的IOSvL2交换机在GNS3上。
我已将开关上的协商设置为auto，用于交换机上的所有接口。并将路由器接口上的双工和速度设置为auto。
但我在交换机上还是收到了一条双工错配信息。
以下是我的路由器配置：
Current configuration : 1098 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
ip tcp synwait-time 5
!
!
!
!
!
interface FastEthernet0/0
ip address 192.168.1.1 255.255.255.0
duplex auto
speed auto
!
interface Serial0/0
no ip address
shutdown
clock rate 2000000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
no ip address
shutdown
clock rate 2000000
!
interface Serial0/2
no ip address
shutdown
clock rate 2000000
!
!
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
!
no cdp log mismatch duplex
!
!
!
control-plane
!
!
!
!
!
!
!
!
!
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
line aux 0
exec-timeout 0 0
privilege level 15
logging synchronous
line vty 0 4
login
!
!
end我的开关配置：
Current configuration : 3548 bytes
!
! Last configuration change at 18:20:49 UTC Tue Apr 16 2019
!
version 15.2
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
service compress-config
!
hostname Switch
!
boot-start-marker
boot-end-marker
!
!
!
no aaa new-model
!
!
!
!
!
!
!
!
ip cef
no ipv6 cef
!
!
!
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface GigabitEthernet0/0
media-type rj45
negotiation auto
!
interface GigabitEthernet0/1
media-type rj45
negotiation auto
!
interface GigabitEthernet0/2
media-type rj45
negotiation auto
!
interface GigabitEthernet0/3
media-type rj45
negotiation auto
!
interface GigabitEthernet1/0
media-type rj45
negotiation auto
!
interface GigabitEthernet1/1
media-type rj45
negotiation auto
!
interface GigabitEthernet1/2
media-type rj45
negotiation auto
!
interface GigabitEthernet1/3
media-type rj45
negotiation auto
!
interface GigabitEthernet2/0
media-type rj45
negotiation auto
!
interface GigabitEthernet2/1
media-type rj45
negotiation auto
!
interface GigabitEthernet2/2
media-type rj45
negotiation auto
!
interface GigabitEthernet2/3
media-type rj45
negotiation auto
!
interface GigabitEthernet3/0
media-type rj45
negotiation auto
!
interface GigabitEthernet3/1
media-type rj45
negotiation auto
!
interface GigabitEthernet3/2
media-type rj45
negotiation auto
!
interface GigabitEthernet3/3
media-type rj45
negotiation auto
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
!
!
!
!
!
control-plane
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
login
!
!
end当我在路由器上运行显示接口时，我得到以下信息：
FastEthernet0/0 is up, line protocol is up
Hardware is Gt96k FE, address is c401.07a8.0000 (bia c401.07a8.0000)
Internet address is 192.168.1.1/24
MTU 1500 bytes, BW 10000 Kbit/sec, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Half-duplex, 10Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:21, output 00:00:08, 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
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
50 packets input, 8748 bytes
Received 50 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
55 packets output, 5963 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface reset在开关上，当我运行显示接口状态时，我得到以下信息：
Port Name Status Vlan Duplex Speed Type
Gi0/0 connected 1 a-full auto RJ45
Gi0/1 connected 1 a-full auto RJ45
Gi0/2 connected 1 a-full auto RJ45
Gi0/3 connected 1 a-full auto RJ45
Gi1/0 connected 1 a-full auto RJ45
Gi1/1 connected 1 a-full auto RJ45
Gi1/2 connected 1 a-full auto RJ45
Gi1/3 connected 1 a-full auto RJ45
Gi2/0 connected 1 a-full auto RJ45
Gi2/1 connected 1 a-full auto RJ45
Gi2/2 connected 1 a-full auto RJ45
Gi2/3 connected 1 a-full auto RJ45
Gi3/0 connected 1 a-full auto RJ45
Gi3/1 connected 1 a-full auto RJ45
Gi3/2 connected 1 a-full auto RJ45
Gi3/3 connected 1 a-full auto RJ45我得到的信息是：*Apr 16 17:36:35.555: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on GigabitEthernet0/1 (not half duplex), with R1 FastEthernet0/0 (half duplex)。
请帮帮我。
谢谢。
回答 1
Network Engineering用户
发布于 2019-04-16 18:13:34
消息来自CDP双工失配检测--它可能表示不存在双工失配，表明CDP本身有问题(尤指。在GNS3中)。
检查双方的接口状态(show interface status)，看看双工模式是否真的不同。如果消息是错误的，您可以通过no cdp log mismatch duplex关闭它。
编辑后show interface status和show interface加法：除了双工失配，路由器的链路显示10 Mbit/s半双工，这甚至可能是通常不可能的链路速度失配。除非中间有另一个装置，否则自动协商已经完全失败，这很可能是模拟中的一个小故障。
页面原文内容由Network Engineering提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://networkengineering.stackexchange.com/questions/58526
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