Uplinks between 3500 switches

[ciscokalpesh]

Hi all,

Its a quite simple question i guess. We are doing some changes in the Network topology. There is a single 3548 switch which have uplinks to 7 other swichtes. There is an 3524 switch which is connected to an old 2924 switch and 2924 is connected to 3548. All switch ports are on default vlan. Now when i remove the 3524-2924 uplink and connect the 3524-3548, the link does not come up !!! 3524 is an external switch and has 3 vlans to seperate the traffic and all ports have portfast enabled only on this switch.

I am out of clue what could be the problem. Please guide.

Thanks in advance.

abc

[mahmoodmkl]

Hi,

I think u should look into STP issues.

Thanks

Mahmood

[ciscokalpesh]

Hi,

Thanks for reply.

I disabled the portfast on the port connecting as uplink on 3524. So STP should work then.

What if if enable portfast on the 3548 port and connect 3524-3548 ?

Thanks again.

abc.

[mahmoodmkl]

Hi

If u dnot want redundant connections between u r switches then u can enable portfast.

Thanks

Mahmood

[ciscokalpesh]

Hi,

Thanks for reply.

Well in that case, if i disable portfast on two uplinks on 3524 and connect one to 3548 and second to 2924 switch. After i remove 3524-2924 uplink, the 3524-3548 should be active. But this is what is not happening. The link between 3524-3548 is not coming up.

Thanks again

abc