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Is SFP adapter good or bad for WLC?

Hi, I am trying to connect WLC4402 to Switch3560poe by SFP adapter. I try it two times with two different brands of SFP. One is "HP 1GB SFP RJ-45 Transceiver Module", and second is "GLC-T 1000BASE-T SFP Transceiver Module for CISCO HIGH QUALITY" The SFP is plugged into WLC and RJ45 end is plugged into Switch3560. I cannot see any lights at its port for the two SFP separately. And then I plugged the two SFP into two distribution ports of the WLC at the same time with one RJ45 cable connecting the two SFP. Then, the two lights of two SFP are on.

My Question is the two SFP are good or bad? or do I need to configure the WLC' distribution port before connecting the WLC with the Switch ? Thank you

Craig Beck

The GLC-T modules will work. I'd check your switch.

The WLC will ONLY talk at 1Gbps so if your is itch is only 10/100 you'll need to use GLC-T in the switch SFP ports to link the WLC, or get a gigabit switch.

eemoon

ASKER

Thank you so much for your fast reply. I think you are right. Some document also mentions this 1Gbps.
The switch gigabitEthernet BW is 10000kbit， while its fastEthernet BW is 100000kbit. Are these BW by default or configured one？ If it is configured, we can get it back to original

Here are switch port info

Switch#sh int gigabitEthernet 0/1
GigabitEthernet0/1 is down, line protocol is down (err-disabled)
Hardware is Gigabit Ethernet, address is 0019.56b4.cd01 (bia 0019.56b4.cd01)
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
....

Switch#sh interfaces fastEthernet 0/1
FastEthernet0/1 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is 0019.56b4.cd03 (bia 0019.56b4.cd03)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 10/100BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00

------

Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 26 WS-C3560-24PS 12.2(25)SEE2 C3560-IPBASEK9-M

Craig Beck

You can ignore the BW on each port. Its a soft value so not used for physical links.

There are 2 problems that I can see here...

1. The Gig0/1 interface is err-disabled. Shut the port then no shut to see if it comes up. If not, check the cable.

2. You've got 2 different types of port connected. If you're using LAG that'll break the link.

Can you post each switch port's config please?

eemoon

ASKER

I also noticed the "err-disabled", which was caused by my test where I connected one cable between ports in the same switch. Now i already have removed the error.

There are two different brand of SFP now. In the switch, I connected the SFP port to fastEthernet port itself(g0/1 to f0/1), it confirmed first SFP cannot work in switch 3560(no lights), and second SFP can bring lights up. So, maybe I need another SFP that is the same brand as the second one. This way I can connect two devices: WLC and the switch.

This switch does not have any configuration yet. Below is show run:

Switch#sh run
Building configuration...

Current configuration : 1290 bytes
!
version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname Switch
!
!
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 trunk encapsulation dot1q
switchport mode trunk
!
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 GigabitEthernet0/1
!
interface GigabitEthernet0/2
!
interface Vlan1
no ip address
!
ip classless
ip http server
ip http secure-server
!
!
control-plane
!
!
line con 0
line vty 0 4
no login
line vty 5 15
no login
!
end

Switch#

ASKER CERTIFIED SOLUTION

Craig Beck

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eemoon

ASKER

Hi I had done that like you said in your post, but it had not worked. Since you said it can work, I re-did it again, but this time I exchanged two SFP to plug, and then its light is up! Thank you

Craig Beck

Glad to help :-)