Cisco 3550 Ethernet Port Up/Down

[par13]

Does any one knows why the cisco 3550's ethernet ports keepts going up and down?

Here is a copy of the running log.

Syslog logging: enabled (0 messages dropped, 1 messages rate-limited, 0 flushes,

0 overruns, xml disabled, filtering disabled)

Console logging: level debugging, 2239 messages logged, xml disabled,

filtering disabled

Monitor logging: level debugging, 0 messages logged, xml disabled,

filtering disabled

Buffer logging: level debugging, 2239 messages logged, xml disabled,

filtering disabled

Exception Logging: size (4096 bytes)

Count and timestamp logging messages: disabled

File logging: disabled

Trap logging: level alerts, 815 message lines logged

Logging to 146.186.27.3, 0 message lines logged, xml disabled,

filtering disabled

Log Buffer (4096 bytes):

state to up

002200: Nov 9 06:42:41: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEth

ernet0/27, changed state to down

002201: Nov 9 06:42:43: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEth

ernet0/27, changed state to up

002202: Nov 9 06:54:16: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEth

ernet0/29, changed state to down

002203: Nov 9 06:54:17: %LINK-3-UPDOWN: Interface FastEthernet0/29, changed sta

te to down

002204: Nov 9 06:54:20: %LINK-3-UPDOWN: Interface FastEthernet0/29, changed sta

te to up

002205: Nov 9 06:54:21: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEth

ernet0/29, changed state to up

002206: Nov 9 06:54:33: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEth

ernet0/29, changed state to down

002207: Nov 9 06:54:34: %LINK-3-UPDOWN: Interface FastEthernet0/29, changed sta

te to down

002208: Nov 9 06:54:37: %LINK-3-UPDOWN: Interface FastEthernet0/29, changed sta

te to up

002209: Nov 9 06:54:38: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEth

ernet0/29, changed state to up

002210: Nov 9 06:54:41: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEth

ernet0/25, changed state to down

002211: Nov 9 06:54:42: %LINK-3-UPDOWN: Interface FastEthernet0/25, changed sta

te to down

002212: Nov 9 06:54:45: %LINK-3-UPDOWN: Interface FastEthernet0/25, changed sta

te to up

002213: Nov 9 06:54:46: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEth

ernet0/25, changed state to up

002214: Nov 9 06:54:58: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEth

ernet0/25, changed state to down

002215: Nov 9 06:54:59: %LINK-3-UPDOWN: Interface FastEthernet0/25, changed sta

te to down

002216: Nov 9 06:55:01: %LINK-3-UPDOWN: Interface FastEthernet0/25, changed sta

te to up

002217: Nov 9 06:55:02: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEth

ernet0/25, changed state to up

002218: Nov 9 07:32:34: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEth

ernet0/33, changed state to down

002219: Nov 9 07:32:35: %LINK-3-UPDOWN: Interface FastEthernet0/33, changed sta

te to down

002220: Nov 9 07:32:39: %LINK-3-UPDOWN: Interface FastEthernet0/33, changed sta

te to up

002221: Nov 9 07:32:40: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEth

ernet0/33, changed state to up

002222: Nov 9 07:32:53: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEth

ernet0/33, changed state to down

002223: Nov 9 07:32:54: %LINK-3-UPDOWN: Interface FastEthernet0/33, changed sta

te to down

002224: Nov 9 07:32:56: %LINK-3-UPDOWN: Interface FastEthernet0/33, changed sta

te to up

002225: Nov 9 07:32:57: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEth

ernet0/33, changed state to up

002226: Nov 9 08:07:48: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEth

ernet0/31, changed state to down

002227: Nov 9 08:07:49: %LINK-3-UPDOWN: Interface FastEthernet0/31, changed sta

te to down

[Giuseppe Larosa]

Hello Pedro,

have you tried to set speed and duplex?

we had a similar issue with C2950.

Hope to help

Giuseppe

[par13]

Hello, here is a copy of int status. Even after running the command speed auto and duplex auto, I still see the difference in port configuration.

#sh int status

Port Name Status Vlan Duplex Speed Type

Fa0/1 Administrative-Net connected 401 a-full a-100 10/100BaseTX

Fa0/2 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/3 Administrative-Net connected 401 a-full a-100 10/100BaseTX

Fa0/4 Administrative-Net connected 401 a-full a-100 10/100BaseTX

Fa0/5 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/6 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/7 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/8 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/9 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/10 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/11 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/12 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/13 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/14 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/15 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/16 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/17 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/18 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/19 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/20 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/21 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/22 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/23 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/24 Administrative-Net notconnect 401 auto auto 10/100BaseTX

Fa0/25 Academic-Network connected 400 a-full a-100 10/100BaseTX

Fa0/26 Academic-Network connected 400 a-full a-100 10/100BaseTX

Fa0/27 Academic-Network connected 400 a-full a-100 10/100BaseTX

Fa0/28 Academic-Network notconnect 400 auto auto 10/100BaseTX

Fa0/29 Academic-Network connected 400 a-full a-100 10/100BaseTX

Fa0/30 Academic-Network connected 400 a-full a-100 10/100BaseTX

Fa0/31 Academic-Network connected 400 a-full a-100 10/100BaseTX

Fa0/32 Academic-Network connected 400 a-full a-100 10/100BaseTX

Fa0/33 Academic-Network connected 400 a-full a-100 10/100BaseTX

Fa0/34 Academic-Network connected 400 a-full a-100 10/100BaseTX

Fa0/35 Academic-Network connected 400 a-full a-100 10/100BaseTX

Fa0/36 Academic-Network connected 400 a-full a-100 10/100BaseTX

Fa0/37 Academic-Network notconnect 400 auto auto 10/100BaseTX

Fa0/38 Academic-Network notconnect 400 auto auto 10/100BaseTX

Fa0/39 Academic-Network notconnect 400 auto auto 10/100BaseTX

Fa0/40 Academic-Network notconnect 400 auto auto 10/100BaseTX

Fa0/41 Academic-Network notconnect 400 auto auto 10/100BaseTX

Fa0/42 Academic-Network notconnect 400 auto auto 10/100BaseTX

Fa0/43 Academic-Network notconnect 400 auto auto 10/100BaseTX

Fa0/44 Academic-Network notconnect 400 auto auto 10/100BaseTX

[Leo Laohoo]

If you move this to a different switch do you get the same response? From my experience, the host OS could be unstable, keeps on rebooting, faulty cabling (patch and horizontal). Duplex mismatch is also another.