Still the Uplink port is in down state on CISCO 3750 after no shutdown command

Hi
We have couple of HP switches and these switches are connected through a fibre link to a Cisco 3750 (One link goes to switch- A and another goes to switch- B)

My predecessor had installed these switches and implemented LACP on these core CISCO 3750 switches please see the attached. The PCs connected to the HP switches are not getting any IP from DHCP, There is no uplink link light coming on Cisco switch A and the uplink port is connected to G3.

I did log into the switch and gave a the following command  and still the port is down state after I  gave no shutdown command.
Switch-Core1# sh ip int brief  and I got the following output and the port GigabitEthernet1/1/3   is down as you can see.
I did  Switch-Core#conf t
Switch-Core1(config) interface GigabitEthernet1/1/3
Switch-Core1(config-if)#no shutdown
Switch-Core1(config-if)#
GigabitEthernet1/0/20  unassigned      YES unset  up                    up
GigabitEthernet1/0/21  unassigned      YES unset  down                  down
GigabitEthernet1/0/22  unassigned      YES unset  down                  down
GigabitEthernet1/0/23  unassigned      YES unset  down                  down
GigabitEthernet1/0/24  unassigned      YES unset  up                        up
GigabitEthernet1/1/1   unassigned      YES unset  up                         up
GigabitEthernet1/1/2   unassigned      YES unset  up                         up
GigabitEthernet1/1/3   unassigned      YES unset  down                    down
GigabitEthernet1/1/4   unassigned      YES unset  up                         up
Te1/1/1                unassigned      YES unset  down                               down
Te1/1/2                unassigned      YES unset  down                              down
GigabitEthernet2/0/1   unassigned      YES unset  up                    up
GigabitEthernet2/0/2   unassigned      YES unset  up                    up
GigabitEthernet2/0/3   unassigned      YES unset  up                    up
GigabitEthernet2/0/4   unassigned      YES unset  down               down
GigabitEthernet2/0/5   unassigned      YES unset  up                    up
GigabitEthernet2/0/6   unassigned      YES unset  down               down
GigabitEthernet2/0/7   unassigned      YES unset  down               down
GigabitEthernet2/0/8   unassigned      YES unset  up                    up
GigabitEthernet2/0/9   unassigned      YES unset  up                    up


Any help much appreciated


 Thanks
new-Switch-Connectivity.png
lianne143Asked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

giltjrCommented:
Have tried swapping out the cable?

If these are SFP ports, try swapping out with a known good SFP.
0
lianne143Author Commented:
If I connect another fibre uplink that comes from the core to same  HP switch , I can see the link on the HP switch.
See the sh ip int brief , the SFP uplink GigabitEthernet1/1/3   is  down
I think some STP has happened in the network and the  GigabitEthernet1/1/3   is  down , even in spite of saying no shutdown , this interface is not up. So I think if this interface is up , the link betweek HP and core must be working.

Please suggest how to go abt sorting this

thanks
0
giltjrCommented:
STP will not cause a port not to come active.  If you have a loop the port would still be active and in a blocked status when you look at spanning tree information on which ever switch is the root.

Did you no shut on both switches involved?

Since it seems to have been working, what changes were made when it stopped working?

I'm confused about what you are saying in your last post though.  It seems like you connected a DIFFERENT cable from a DIFFERENT port to a DIFFERENT port and and you can see the link light on DIFFERENT port.

What happens you connect a DIFFERENT cable to the same ports?  

I beleive that you may have a cable or SFP problem, so you need to try to swap out the cable and the SFP's at both nds.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Craig BeckCommented:
With everything connected as you want it can you issue the following commands on the 3750 stack and post the output?

show run int gi1/1/3
show etherchannel summary
show interface transceiver
show log
0
Otto_NCommented:
I agree with giltjr:  The fact that the interface is down/down would indicate a physical problem - In my experience, I always first check if the Tx/Rx fibres aren't swopped - "show interface transceiver" should tell you the optical power levels on the SFP, but only if you have SFP's with the Digital Optical Monitoring (DOM) feature.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
TCP/IP

From novice to tech pro — start learning today.