tbartim
asked on
SFP Trunk will not come up on Cisco 2960 switch
Trying to connect fiber from a 3750 to 2960 cisco devive and the 2960 trunk port never comes up not eevn with the no shutdown command
Here is trunk config on the 2960
nterface GigabitEthernet1/0/49
description Uplink to Core 3750
switchport trunk native vlan 98
switchport mode trunk
srr-queue bandwidth share 10 10 60 20
queue-set 2
priority-queue out
mls qos trust dscp
auto qos voip trust
Here is trunk config on the 2960
nterface GigabitEthernet1/0/49
description Uplink to Core 3750
switchport trunk native vlan 98
switchport mode trunk
srr-queue bandwidth share 10 10 60 20
queue-set 2
priority-queue out
mls qos trust dscp
auto qos voip trust
ASKER
fiber cables are round
what cables are you using? thought they could only use LC cables which are made up of a pair.
ASKER
LC Cables which is a pair
tbartim:
fiber cables are round
when you said that i though you meant you were using ST cables.
you can swap the left and right cables over. if they are "crossed" the link wont come up as you'll have TX to TX rather than TX to RX.
As i said, happens all the time at our DC with LC cables. I end up flipping the sides round (hurts your fingers) and all is well.
If that's not it and both transievers have light, the cables not broken and you've issued a "no shut" then no idea.
ASKER
yes Ive tried swapping (reversing the cables ) with no luck
The transciervers (SFP modules have no link lights lit on the 2960 but on the 3750 they are lit with a solid green
The transciervers (SFP modules have no link lights lit on the 2960 but on the 3750 they are lit with a solid green
have you unplugged the fiber and looked inside the tranceiver on the 2960? you should see one side glowing red. if it's not then you probably have a duff/incompatible tranceiver. try swapping them between the switches. and see if they light then.
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
ASKER
We Got the trunks going by turning off autonegotian and forcing full duplex on bothe the cisco 3750 and 2960
SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
ASKER
"That's fantastic news. You must be very pleased. These niggling things can be very frustrating"
Yes indeed I am thanks for everyones input
Yes indeed I am thanks for everyones input
Bizarre that Auto-Neg broke it. Glad you got it working in the end though.
Is the fiber the right way round? look in the transciever and check you have light going to dark and vice versa.