Add 3750 as Gigabit Backbone to LAN

[Fletch12]

I am by no means a Cisco expert, so I apologize for my limited knowledge on this ahead of time. We currently have three Cisco 2950 switches. These are currently connected via the fast-ethernet ports.

However, we also have a 3750 switch, SFP SX transceivers, and 1000BASE-SX SFP modules (for the 2950 switches) that are not being used. I'd like to install this into our LAN to improve performance and redundancy. I have tried installing one of the 1000Base-SX modules into the GigabitEthernet ports of one of the 2950 switches, one of the SX transceivers in the 3750 switch, and connected these via a SC/LC fiber jumper, but I do not get any active LED lights on either port. I went through the express setup on the 3750 switch. Does anyone know what I'm doing wrong? We currently only have one VLAN on our LAN.

 

[ISPKing]

You may need to unshut the interfaces, select a media type, or something completely else but you need to log into the swtiches and post the output of the show run command

CCNP

 

[Fletch12]

Here is the "sh run" output from both switches. Thanks.

2950 Switch

sh run
Building configuration...

Current configuration : 2083 bytes
!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log datetime
no service password-encryption
service sequence-numbers
!
hostname PRDSWITCH2
!
enable secret 5
!
ip subnet-zero
!
!
cluster commander-address 0000.0000.0000 member 4 name LAN_SWITCHES vlan 1
spanning-tree mode pvst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
!
!
!
!
interface FastEthernet0/1
!
interface FastEthernet0/2
!
interface FastEthernet0/3
!
interface FastEthernet0/4
!
interface FastEthernet0/5
!
interface FastEthernet0/6
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
!
interface FastEthernet0/22
!
interface FastEthernet0/23
!
interface FastEthernet0/24
!
interface FastEthernet0/25
!
interface FastEthernet0/26
!
interface FastEthernet0/27
!
interface FastEthernet0/28
!
interface FastEthernet0/29
!
interface FastEthernet0/30
!
interface FastEthernet0/31
!
interface FastEthernet0/32
!
interface FastEthernet0/33
!
interface FastEthernet0/34
!
interface FastEthernet0/35
!
interface FastEthernet0/36
!
interface FastEthernet0/37
!
interface FastEthernet0/38
!
interface FastEthernet0/39
!
interface FastEthernet0/40
!
interface FastEthernet0/41
!
interface FastEthernet0/42
!
interface FastEthernet0/43
!
interface FastEthernet0/44
!
interface FastEthernet0/45
!
interface FastEthernet0/46
!
interface FastEthernet0/47
!
interface FastEthernet0/48
!
interface GigabitEthernet0/1
!
interface GigabitEthernet0/2
!
interface Vlan1
ip address 192.168.2.1 255.255.0.0
no ip route-cache
!
ip http server
!
line con 0
exec-timeout 0 0
line vty 0 4
password
login
line vty 5 15
password
login
!
!
end

PRDSWITCH2#


3750 Switch

sh run
Building configuration...

Current configuration : 1106 bytes
!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname MAINSW1
!
enable secret 5
enable password
!
ip subnet-zero
!
!
spanning-tree mode pvst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
!
!
interface GigabitEthernet1/0/1
no ip address
!
interface GigabitEthernet1/0/2
no ip address
!
interface GigabitEthernet1/0/3
no ip address
!
interface GigabitEthernet1/0/4
no ip address
!
interface GigabitEthernet1/0/5
no ip address
!
interface GigabitEthernet1/0/6
no ip address
!
interface GigabitEthernet1/0/7
no ip address
!
interface GigabitEthernet1/0/8
no ip address
!
interface GigabitEthernet1/0/9
no ip address
!
interface GigabitEthernet1/0/10
no ip address
!
interface GigabitEthernet1/0/11
no ip address
!
interface GigabitEthernet1/0/12
no ip address
!
interface Vlan1
ip address 192.168.2.4 255.255.0.0
!
ip classless
ip http server
!
!
line con 0
line vty 0 4
password
login
line vty 5 15
password
login
!
end

MAINSW1#

 

[brianinms]

Try switching the connections on the SC side of the fiber connection. Essentially to connect two fiber ports together you have to have the equivalent of a cross over cable as a straight thru wont work.

 

[Fletch12]

Thanks brianinms. That worked!

 

[burtsbees]

Star him!

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!