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Checking Port Speed on Cisco Switch

C

Carlosinfl

Loves the juice
Joined
Sep 25, 2002
Messages
6,633
I have just verified that our Sun NAS device has an interface that for some reason is downgraded to 100Mb when it should be running at 1Gb. The other 3 interfaces on the Sun device connected to the same switch / same grade cable are all running at the correct speed except for Sun Gb port 3 which is wired to Cisco Gb switch port 10. When I connect to the Cisco switch to verify if for whatever reason the specific port #10 was configured to run at 100Mb, I am not sure I understand how to verify the port speed. I see the following when I issue the 'show run' command:

Code: 
!
interface GigabitEthernet0/9
 switchport mode access
 storm-control broadcast level 40.00
 storm-control multicast level 40.00
 storm-control unicast level 80.00
 spanning-tree portfast
!
[COLOR="Yellow"][B]interface GigabitEthernet0/10[/B][/COLOR]
 switchport mode access
 storm-control broadcast level 40.00
 storm-control multicast level 40.00
 storm-control unicast level 80.00
 spanning-tree portfast
!
interface GigabitEthernet0/11
 switchport mode access
 storm-control broadcast level 40.00
 storm-control multicast level 40.00
 storm-control unicast level 80.00
 spanning-tree portfast
!

Does this mean that since no speed is indicated that the ports are running at 1000Mb?
 
You can do a quick "sh int status" and it'll list the Duplex and Speed. It'll also tell you if it's set to auto/auto.
 
I did as you suggested:

Code: 
idesrvsw1#sh int status

Port      Name               Status       Vlan       Duplex  Speed Type
Gi0/1                        connected    1          a-full a-1000 10/100/1000BaseTX
Gi0/2                        connected    1          a-full a-1000 10/100/1000BaseTX
Gi0/3                        notconnect   1            auto   auto 10/100/1000BaseTX
Gi0/4                        connected    1          a-full a-1000 10/100/1000BaseTX
Gi0/5                        notconnect   1            auto   auto 10/100/1000BaseTX
Gi0/6                        connected    1          a-full a-1000 10/100/1000BaseTX
Gi0/7                        connected    1          a-full a-1000 10/100/1000BaseTX
Gi0/8                        connected    1          a-full a-1000 10/100/1000BaseTX
Gi0/9                        connected    1          a-full a-1000 10/100/1000BaseTX
[B][COLOR="Yellow"]Gi0/10                       connected    1          a-full  a-100 10/100/1000BaseTX[/COLOR][/B]

Do does this mean that the port is running as expected and something else is auto negotiating a slower speed than expected?
 
looks to me the host or whatever is on the other end of gi0/10 can only negotiate 100full....if its a gigE nic i'd start with cabling....
 
Thanks all. Forced the interface to 1Gb and the thing was dead so I then replaced the cable and it auto negotiated perfect to 1Gb. Bad cable.

Thanks for help!
 
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