3550 switch

[oddyager]

I just wiped a 3550 switch of all its configs/vlan info and started from scratch. I then ran through the initial configs and basic management and for whatever reason none of the ports are active if I plug it onto the network (simple network cable connecting between switches). This works fine with any other switch but this one. I tried issuing shutdown and no shutdown commands to restart the ports but to no avail. Is there a step I missed?

Heres what the current config looks like:

version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname testswitch
!
enable secret 5 blah
enable password blah
!
no aaa new-model
ip subnet-zero
!
!
!
!
!
!
no file verify auto
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
interface FastEthernet0/1
switchport mode dynamic desirable
!
!
!
interface FastEthernet0/47 <-- been using this port to test
switchport mode access
!
interface FastEthernet0/48
switchport mode dynamic desirable
!
interface GigabitEthernet0/1
switchport mode dynamic desirable
!
interface GigabitEthernet0/2
switchport mode dynamic desirable
!
interface Vlan1
ip address 192.168.x.x 255.255.252.0
!
ip classless
ip http server
ip http secure-server
!
!
control-plane
!
!
line con 0
line vty 0 4
password blah
no login
line vty 5 15
password blah
no login
!
!
end

 

[nweaver]

are you using a crossover cable

are you crossing to 10/100

 

[oddyager]

i'm not using a crossover.

 

[azev]

if you're not using crossover cable then you need to add an interface command:

auto mdix

or something like that, I dont quite remember exactly what is the command.

 

[oddyager]

Isn't that enabled by default? The ports on both sides are set to auto.

 

[azev]

I am not sure if they are enabled by default, infact I just remember that 3550 does not support auto mdix. What switch are you trying to connect this 3550 to ?? maybe that switch doesnt support mdix also?

try crossover cable, I think that'll solve your issues.

 

[oddyager]

its a 3550 to another 3550. i also have a 3560 that i was able to connect succesfully.

 

[azev]

after quick cisco research I confirmed that a 3550 does not support auto mdix.
a 3560 do have auto mdix though, I know that for a fact because I have one on my desk right now .

Have you tried different cable ? maybe bad cable ? how bout trying crossover cable for 3550 to another 3550 ? or you can enable mdix on the 3560 and connect the 3550 to it with a good cable.

 

[oddyager]

I tried different cables and no-go. cross-over doesn't work either. I'm pretty sure its something on the 3550 (the "client" side) because i hooked up a 3560 and its fine.

 

[azev]

so, when you connect the 3550 to a 3560 the link comes up?

Maybe you can try to hardcode the port setup on a 3550 to 3550 connection such as:

speed 100
duplex full
no negotiation

Oh yeah try this with a crossover cable.
Good luck

 

[oddyager]

No good still. Both show up as notconnect.

 

[azev]

does the link light even turned on ?? how bout making both ports trunk ?

 

[oddyager]

no link light at all. green or amber. i tried configuring them as trunks and no good either. it's as if the switch isn't even there, though it is, heh.

 

[ITJunkie]

I may be way off base here but I didn't see it addressed...have you added the ports to the vlan(s)?

 

[spidey07]

Originally posted by: ITJunkie
I may be way off base here but I didn't see it addressed...have you added the ports to the vlan(s)?

Yeah, you'll have to have the ports in the correct vlans. Otherwise the switches will yell at you and turn the ports/spanning-tree block them.

Also make sure you aren't running bdpuguard on the ports or portfast.

Are you sure you're using a known good crossover cable?

Also make sure you "no shut" the port. check for what the logs say when you connect the switch.

but I'm guessing with no link the cable is bad.

 

[jimdwa6538]

Make sure that your trunk port is in the same native vlan on both switches

 

[azev]

if a port is blocked by spanningtree, the link light should still be on (amber)