CDP-4-DUPLEX MISMATCH

CDP-4-DUPLEX_MISMATCH

 

00:13:14: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/21 (not half duplex), with RACK1506 Ethernet0/1 (half duplex).

 

show interface status 하면 포트별로 duplex 와 speed 의 상태가 나옵니다. 확인 후~수동으로 설정

 

Dulpex MisMatch 해결

R3#

*Mar  1 01:49:43.307: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on 
FastEthernet0/0 (not full duplex), with SW1 FastEthernet1/9 (full duplex).

R3[Fa0/0] --------------- [Fa1/9]SW1

R3(config)# int fa0/0
R3(config-if)# speed 100
R3(config-if)# duplex full

SW1(config)# int fa1/9
SW1(config-if)# speed 100
SW1(config-if)# duplex full