Connect Cisco 3750 with Fiber

"Is Cisco 3550 using a WS-G5486 Gigabit module? What's SFP module would you use to connect a Cisco WS-C3750X-48P-L PoE switch ? Does anyone have experience with SX to LX adapters and if they are reliable?"
A:Hi, to connect them well, you would need to use a GLC-LH-SMD transceiver for this, and a LC-SC single-mode patch cord (if they're being connected directly without an intermediate patch-panel).

I am not an expert with Cisco WS-C3750X-48P-L PoE switch but you may want to post it to Cisco community forum. Here's the link to that: https://supportforums.cisco.com/community/5976/small-business-switches

Similar Messages

Problems connecting two stacks with fiber

I am having problems getting the 2 stacks to see each other with fiber. just your basic stacks, nothing fancy. Is there a line in the config that needs to be added? Fiber LED's are not lit.

Hi!
As you said the fiber LEDs are not lit, that means the ports are not 'up' so the stacking has not been done.
Log into your switches and then run the command 'Show int interface name' to know the status of the fiber ports.
Also check the connectivity of the stacking cables with the ports in the switch. Maybe you can take them out and then connect them again.
HTH, please rate the post if it does.

Connect 2 switch with fiber

Hi everybody,
I´m trying connect two catalyst 3560 Catalyst switch through fiber. I have a network in the office, it is working. Now, I need to take a switch in my office network (switch A) and add a new switch (switch B) for connect a near office. I have the same converter modulo in both extreme (finisar trj8519p1bnl-mc), I configured the switch B with Ethernet wire (from 10.0.0.1) and I put an IP within to office range IP (the same that others switch).
But when I connect the fiber in both switch port, the ports led are off. When I access to web interface from switch A, I can see the fiber port in yellow.
Somebody can help me?
Thanks!

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Posting
Unsure if this is your issue, but many Cisco devices, by default, won't run non-Cisco optics. If not already doing so, you might try adding "service unsupported-transceiver" to your configuration.

Connecting 2 switches with Fiber

Hi,
I have a basic question regarding two 3750G switches I would like to connect using fiber.
I have the 2 Twingig modules converter available for each switch.
I need to know my requirement to connect these two switch by their uplink.
I have already on my list:
1 SFP module (GLC-SX-MM) the question is how many SFP modules will I need to connect these 2 switches as each switch has 2 Twingig port (hence 4 SFP ports available). since each Twing Gig port has 2 SFP module.should I use 1 Twin Gig module and ordre 2 SFP modules (GLC-SX-MM) for each switch (hence 4 GLC-SX-MM )for the connection to work ?
Thanks for your guidance and related documentation you'll be giving.

According to the following Cisco document, the Twingig converter module can be used with up to 2 SFPs; which would seem to indicate the use of 1 SFP in a Twingig converter module is supported.
<http://www.cisco.com/en/US/docs/switches/lan/catalyst3750e_3560e/hardware/install/notes/1757202.html>
You could install 2 SFPs per switch and run EtherChannel to gain additional uplink bandwidth.

Trouble connecting Cisco router with cable modem for Internet purposes

So I am requesting help from the Cisco community on this issue as the cable company states there equipment is working fine. At all my facilities I have a guest Internet service setup through a local Internet provide to provide Internet services to the residents and guests. I have the cable modem usually a Motorola SBG6580 or a SMC 8014 (both provided by cable company) connected to my router on a FE or GE interface. I am using static IPs and using the cable modem just as a modem (bridge mode). Over the past several months these connections have just stopped working. I have not made any drastic changes to my router configs; however, the cable company has updated the firmware on these modems. I am wondering if that could affected how the modem and router talk. I was told by the cable company that the modem sees the Cisco router but that the port is inactive. My router shows the port is active and traffic passing. Does anyone have any ideas that could point where the problem lies? I will post a basic config to one that currently does not work. I am using a VRF to route a certain group out, using NAT. Please let me know if I need to post additional info. Any help would be greatly appreciated.
Cisco CISCO2911/K9
Version 15.2(3)T1
service timestamps debug datetime localtime
service timestamps log datetime localtime show-timezone
service password-encryption
hostname 1204RTR01
boot-start-marker
boot system flash0:c2900-universalk9-mz.SPA.152-3.T1.bin
boot system flash0:c2900-universalk9-mz.SPA.151-3.T.bin
boot-end-marker
card type t1 0 0
logging buffered 64000
aaa new-model
aaa session-id common
clock timezone cst -6 0
clock summer-time CDT recurring
no ipv6 cef
no ip source-route
ip vrf 5
rd 5:1
ip multicast-routing
1
ip dhcp pool Guest
vrf 5
network 10.51.XXX.0 255.255.255.0
default-router 10.51.XXX.XXX
dns-server 209.18.47.61 209.18.47.62
ip flow-cache timeout active 1
no ip bootp server
no ip domain lookup
ip cef
multilink bundle-name authenticated
application
global
service alternate default
license udi pid CISCO2911/K9 sn FTX1508AHTM
hw-module pvdm 0/0
redundancy
ip tcp synwait-time 10
interface GigabitEthernet0/0.5
description Guest VLAN
encapsulation dot1Q 5
ip vrf forwarding 5
ip address 10.51.xx.xxx 255.255.255.0
no ip redirects
no ip proxy-arp
ip nat inside
ip virtual-reassembly in
ip tcp adjust-mss 1452
interface GigabitEthernet0/1
no ip address
duplex auto
speed auto
interface GigabitEthernet0/2
description Guest Intenet access
ip vrf forwarding 5
ip address 24.242.182.182 255.255.255.252   <--Cable company IP, Modem IP is 24.242.182.181
ip nat outside
ip virtual-reassembly in
load-interval 30
duplex auto
speed auto
ip forward-protocol nd
no ip http server
ip http authentication local
no ip http secure-server
ip http timeout-policy idle 60 life 86400 requests 10000
ip nat inside source list 9 interface GigabitEthernet0/2 vrf 5 overload
ip route vrf 5 0.0.0.0 0.0.0.0 24.242.182.181
access-list 9 permit 10.51.204.0 0.0.0.255

Ok, mysteriously this location just started working yesterday, but I still am dealing with seven others and I really would like to know what is going on. I will give you everything you may need and let me know.
Config:
version 15.2
no service pad
service timestamps debug datetime localtime
service timestamps log datetime localtime show-timezone
service password-encryption
hostname 1112RTR01
boot-start-marker
boot system flash0:c2900-universalk9-mz.SPA.152-3.T1.bin
boot system flash0:c2900-universalk9-mz.SPA.151-1.T.bin
boot-end-marker
aaa new-model
aaa session-id common
clock timezone CDT -6 0
clock summer-time CDT recurring
network-clock-participate wic 0
network-clock-select 1 T1 0/0/0
no ipv6 cef
no ip source-route
ip vrf GuestVRF
rd 5:1
ip multicast-routing
ip dhcp pool Guest
vrf GuestVRF
network 10.51.112.0 255.255.255.0
default-router 10.51.112.1
dns-server 209.18.47.61 209.18.47.62
ip flow-cache timeout active 1
no ip bootp server
no ip domain lookup
ip cef
application
global
service alternate default
interface Embedded-Service-Engine0/0
no ip address
shutdown
interface GigabitEthernet0/0.5
description Guest VLAN
encapsulation dot1Q 5
ip vrf forwarding GuestVRF
ip address 10.51.112.1 255.255.255.0
no ip redirects
no ip proxy-arp
ip nat inside
ip virtual-reassembly in
ip tcp adjust-mss 1452
interface GigabitEthernet0/1
description Guest Internet (Time Warner Connection)
ip vrf forwarding GuestVRF
ip address 97.77.116.234 255.255.255.252
ip nat outside
ip virtual-reassembly in
load-interval 30
duplex auto
speed auto
ip forward-protocol nd
ip nat inside source list 5 interface GigabitEthernet0/1 vrf GuestVRF overload
ip route vrf GuestVRF 0.0.0.0 0.0.0.0 97.77.116.233
access-list 5 permit 10.51.112.0 0.0.0.255
control-plane
end
router#sh ip arp vrf GuestVRF
router#Internet 97.77.116.233           2   f80b.bee7.e09f ARPA   GigabitEthernet0/1
Protocol Address          Age (min) Hardware Addr   Type   Interface
Internet 97.77.116.234           -   8843.e13c.8d99 ARPA   GigabitEthernet0/1
router#ping vrf GuestVRF 97.77.116.233
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 97.77.116.233, timeout is 2 seconds:
Success rate is 0 percent (0/5)
router#sh int g0/1
GigabitEthernet0/1 is up, line protocol is up
Hardware is CN Gigabit Ethernet, address is 8843.e13c.8d99 (bia 8843.e13c.8d99)
Description: Guest Internet (Time Warner Connection)
Internet address is 97.77.116.234/30
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full Duplex, 1Gbps, media type is RJ45
output flow-control is XON, input flow-control is XON
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 00:00:10
Input queue: 76/75/15/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
30 second input rate 3000 bits/sec, 7 packets/sec
30 second output rate 0 bits/sec, 0 packets/sec
     81 packets input, 4860 bytes, 0 no buffer
     Received 81 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 12 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     16 packets output, 1193 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out
router#sh int g0/1
GigabitEthernet0/1 is up, line protocol is up
Hardware is CN Gigabit Ethernet, address is 8843.e13c.8d99 (bia 8843.e13c.8d99)
Description: Guest Internet (Time Warner Connection)
Internet address is 97.77.116.234/30
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full Duplex, 1Gbps, media type is RJ45
output flow-control is XON, input flow-control is XON
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 00:00:42
Input queue: 76/75/67/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
30 second input rate 3000 bits/sec, 7 packets/sec
30 second output rate 1000 bits/sec, 2 packets/sec
     408 packets input, 24480 bytes, 0 no buffer
     Received 408 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 61 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     72 packets output, 5669 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out
I am receiving packets in and out of the interface but I cannot ping the modem through the VRF.
router#sh ip nat translations
Pro Inside global      Inside local       Outside local      Outside global
udp 97.77.116.234:3169 10.51.112.39:3169 209.18.47.62:53    209.18.47.62:53
udp 97.77.116.234:8534 10.51.112.39:8534 209.18.47.61:53    209.18.47.61:53
udp 97.77.116.234:12244 10.51.112.39:12244 209.18.47.61:53   209.18.47.61:53
udp 97.77.116.234:14002 10.51.112.39:14002 209.18.47.61:53   209.18.47.61:53
udp 97.77.116.234:23623 10.51.112.39:23623 209.18.47.62:53   209.18.47.62:53
udp 97.77.116.234:24489 10.51.112.39:24489 209.18.47.61:53   209.18.47.61:53
udp 97.77.116.234:24550 10.51.112.39:24550 209.18.47.61:53   209.18.47.61:53
udp 97.77.116.234:27458 10.51.112.39:27458 209.18.47.62:53   209.18.47.62:53
udp 97.77.116.234:28603 10.51.112.39:28603 209.18.47.62:53   209.18.47.62:53
udp 97.77.116.234:37404 10.51.112.39:37404 209.18.47.62:53   209.18.47.62:53
udp 97.77.116.234:53942 10.51.112.39:53942 209.18.47.61:53   209.18.47.61:53
udp 97.77.116.234:58125 10.51.112.39:58125 209.18.47.62:53   209.18.47.62:53
udp 97.77.116.234:64797 10.51.112.39:64797 209.18.47.61:53   209.18.47.61:53
udp 97.77.116.234:56925 10.51.112.52:56925 209.18.47.61:53   209.18.47.61:53
udp 97.77.116.234:56925 10.51.112.52:56925 209.18.47.62:53   209.18.47.62:53
udp 97.77.116.234:62342 10.51.112.52:62342 209.18.47.62:53   209.18.47.62:53
tcp 97.77.116.234:36559 10.51.112.69:36559 199.167.177.46:1227 199.167.177.46:1227
tcp 97.77.116.234:48895 10.51.112.69:48895 54.195.253.126:5223 54.195.253.126:5223
tcp 97.77.116.234:58385 10.51.112.69:58385 54.195.243.137:5223 54.195.243.137:5223
Pro Inside global      Inside local       Outside local      Outside global
tcp 97.77.116.234:58658 10.51.112.71:58658 31.13.66.165:443 31.13.66.165:443
udp 97.77.116.234:3066 10.51.112.72:3066 209.18.47.62:53    209.18.47.62:53
udp 97.77.116.234:3884 10.51.112.72:3884 209.18.47.61:53    209.18.47.61:53
udp 97.77.116.234:6656 10.51.112.72:6656 209.18.47.61:53    209.18.47.61:53
udp 97.77.116.234:11194 10.51.112.72:11194 209.18.47.61:53   209.18.47.61:53
udp 97.77.116.234:11774 10.51.112.72:11774 209.18.47.62:53   209.18.47.62:53
Let me know if you need anything else. I need to figure this out and I just don't get it because the other site wasn't working a few days ago and all of a sudden it is working again but others are still not.

Connecting two 4510r with Fiber

I would like to connect two 4510r (50 Km separated) via FO but it doesn´t seem to support ZX FSPs and the supervisors don´t have GBIC slots. Any recommendations?

Two questions -
What Sup is in question?
Are you using this SFP( part number GLC-ZX-SM=) ?
This SFP seems to be supported by Sup IV and SuP V.
http://www.cisco.com/en/US/products/hw/switches/ps4324/products_data_sheets_list.html
Also check this link. The highlight being
"Cisco 1000BASE-ZX GBIC can reach up to 62 miles (100 km) by using dispersion shifted SMF or low-attenuation SMF; the distance depends on fiber quality, number of splices, and connectors."
http://www.cisco.com/en/US/products/hw/modules/ps872/products_data_sheet09186a008014cb5e.html
HTH
PS: please remember to rate posts!

Cisco routers with Fiber-optic interface

is there are router with both Fiber-optic (SM) and E1 interface that can act as a redundant on a both Microwave and Fiber Optic transmission.

Hi
You can think off about going on for New Cisco ISR series routers coz Cisco 2600 series have reached EOL/EOS stage...
For different available models do refer this link..
http://www.cisco.com/en/US/products/ps5854/prod_models_comparison.html
On the modules/interfaces supported do check this out ..
http://www.cisco.com/en/US/products/ps5854/products_relevant_interfaces_and_modules.html
regds

Cisco 3750 with integrated WLC, wpa2 ent, 802.1x and ms IAS.

So first post, I usually figure most of this stuff out. I have this all working with latest firmware etc, but I have more of a MS IAS issue than anything.
The Peap cert used is one generated for my IAS controller, but I have two things... I'd like it to be highly available (if I shutdown Ias#1 it uses ias#2 and has a different certificate as its host name dependent). Also, if I can get a certificate for both IAS servers (using ms cert authority, trusted by all my comp's etc), I'd like it to be more than a one year cert.
Both IAS servers are DC's, so when creating a cert request from Mmc cert snapin for machine, it has the template domain controller and only uses the machine name. I need to make a 2-5 year cert generic for IAS.
Thanks for any help.
Sent from Cisco Technical Support iPad App

There are two thing you could do.
1.) use a GPO to push the certificate from IAS#2 to all your clients.
2.) under the PEAP config, uncheck the validate server certificate box.
With PEAP, the supplicant doesn't 'need/have' to have the server cert, it's an option. When I'm testing, I alwasy uncheck this box. You could test if the clients will failover to the other IAS with the option unchecked.
As for the cert, are both of these devices a CA, or are you using as self genereated cert? If you have multiple IAS, you may want to promote a server to be a CA< and then issue both of these servers a cert from there. Then you only need to have your CA root on the client, instead of each IAS.
HTH,
Steve
Please remember to rate helpful posts or to mark the question as answered so that it can be found later.

Challenge: Spanning Tree Control Between 2 links from Switch DELL M6220 to 2 links towards 2 switches CISCO 3750 connected with an stack (behavior like one switch for redundancy)

Hello,
I have an Spanning tree problem when i conect 2 links from Switch DELL M6220 (there are blades to virtual machines too) to 2 links towards 2 switches CISCO 3750 connected with an stack (behavior like one switch for redundancy, with one IP of management)
In dell virtual machine is Spanning tree rapid stp, and in 3750 is Spanning tree mode pvst, cisco says that this is not important, only is longer time to create the tree.
I dont know but do you like this solutions i want to try on sunday?:
Could Spanning tree needs to work to send one native vlan to negociate the bdpus? switchport trunk native vlan 250
Is it better to put spanning-tree guard root in both 3750 in the ports to mitigate DELL to be root in Spanning Tree?
Is it better to put spanning- tree port-priority in the ports of Swicht Dell?
¿could you help me to control the root? ¿Do you think its better another solution? thanks!
CONFIG WITH PROBLEM
======================
3750: (the 2 ports are of 2 switches 3750s conected with a stack cable, in a show run you can see this)
interface GigabitEthernet2/0/28
description VIRTUAL SNMP2
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 4,13,88,250
switchport mode trunk
switchport nonegotiate
logging event trunk-status
shutdown
interface GigabitEthernet1/0/43
description VIRTUAL SNMP1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 4,13,88,250
switchport mode trunk
switchport nonegotiate
shutdown
DELL M6220: (its only one swith)
interface Gi3/0/19
switchport mode trunk
switchport trunk allowed vlan 4,13,88,250
exit
interface Gi4/0/19
switchport mode trunk
switchport trunk allowed vlan 4,13,88,250
exit

F.Y.I for catylyst heroes - here is the equivalent config for SG-300 - Vlan1 is required on the allowed list on the catylyst side (3xxx/4xxx/6xxx)
In this example:
VLANS - Voice on 188, data on 57, management on 56.
conf t
hostname XXX-VOICE-SWXX
no passwords complexity enable
username xxxx priv 15 password XXXXX
enable password xxxxxx
ip ssh server
ip telnet server
crypto key generate rsa
macro auto disabled
voice vlan state auto-enabled !(otherwise one switch controls your voice vlan….)
vlan 56,57,188
voice vlan id 188
int vlan 56
ip address 10.230.56.12 255.255.255.0
int vlan1
no ip add dhcp
ip default-gateway 10.230.56.1
interface range GE1 - 2
switchport mode trunk
channel-group 1 mode auto
int range fa1 - 24
switchport mode trunk
switchport trunk allowed vlan add 188
switchport trunk native vlan 57
qos advanced
qos advanced ports-trusted
exit
int Po1
switchport trunk allowed vlan add 56,57,188
switchport trunk native vlan 1
do sh interfaces switchport po1
!CATYLYST SIDE
!Must Explicitly allow VLan1, this is not normal for catalysts - or spanning tree will not work ! Even though it’s the native vlan on both sides.
interface Port-channel1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,56,57,189
switchport mode trunk

Need help for Fiber GLC-LH-SM connection between Cisco 3750

Please help me. I want to connect my two Cisco 3750 switch by gbic GLC-LH-SM.Unfortunately, when i trying to connect,it's not uplink.
More information about two switch below:
Gi1/0/51 notconnect 1 auto auto 1000BaseLX SFP
switch 2 show interface status
Gi2/0/51 notconnect 1 auto auto 1000BaseLX SFP
I have no idea to deal with it,any ideas ?

are the gbics cisco original ?
if yes then just make sure of the cable which should be Single mode.
if still not working try to reverse the cable connectors on one side as well.

HP 6600 connected to Cisco 3750

Hello,
I have a new hp 6600-24XG 10gb switch. I would like to connect it to an existing cisco 3750 core switch so the hp will see the network. Is it possiblle to connent one of the 10 gig ports to the 3750's one gig port and set the speed to one gig?
Would I have to buy a module for one or the other of will this just now work?
I appreciate any feedback.
Thank you

miczellcisco wrote:Hello,I have a new hp 6600-24XG 10gb switch. I would like to connect it to an existing cisco 3750 core switch so the hp will see the network. Is it possiblle to connent one of the 10 gig ports to the 3750's one gig port and set the speed to one gig? Would I have to buy a module for one or the other of will this just now work?I appreciate any feedback.Thank you
According to HP's product page, the ports in that switch are 10 GbE only - so no you can't connect to it at one gig.
You could buy a 10 gig module for your 3750 switch - a C3KX-NM-10G (SFP), C3KX-NM-10GT (Copper) or C3KX-SM-10G (SFP with advanced features like Netflow), install it and use that to link to your HP switch.
Cheers

Best way to connect 2 Cisco 3750 PoE 24-port Switches

Hello. I have 2 Cisco 3750 PoE 24-port switches in a small office environment. Right now I have a trunk configured off my ASA 5505 to switch 1, and then just an access port configured on a port (switch 1) and an access port configured on a port (switch 2) to connect them together. These switches also have 2 GB SFP ports but they are not being used in this configuration.
I was curious to know if anyone had any better recommend configurations for connecting these 2 switches together? I'm not sure if this particular model can be stacked?

What are the exact model numbers (should be written on a sticker)?
You will know if they can be stacked as you will see the 2x stack ports on the back of each switch :)
If they can then that is probably the way to go unless you want to keep them as separate switches for some reason.
If you want them separate, I would connect them via a Trunk link at least so you can have the same Vlans on both.
Thanks

Two switches connected with fiber in mode trunk - Problem

Hi to all.
Iam new in the forum, and my english is bad.
I want to post a problem. I have two switches connected with fiber in mode trunk, in the switch C3550 i have this configuration:
interface FastEthernet0/1
description Enlace LAB Medicion
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
duplex full
spanning-tree portfast
In the switch C2960 this configuration, on interfaces Fa0/48, Giga0/1:
interface FastEthernet0/48
switchport trunk allowed vlan 1,20,229
switchport mode trunk
spanning-tree portfast
interface GigabitEthernet0/1
switchport trunk allowed vlan 1,20,229
switchport mode trunk
media-type sfp
duplex full
spanning-tree portfast
The problem:
The ip phones with Voice vlan (vlan 20), not find the DHCP server located in the data vlan (vlan 229)
However, using the command:
#switchport trunk native vlan 229
The result is the voice vlan works, but the data vlan not and viceversa depending if the native vlan 229 is present.
I will appreciate any suggestion.

leolaohoo.
The configuration on ports switch C2960, have the mode access with voice vlan 20:
interface FastEthernet0/1
switchport access vlan 229
switchport mode access
switchport voice vlan 20
spanning-tree portfast
interface FastEthernet0/2
switchport access vlan 229
switchport mode access
switchport voice vlan 20
spanning-tree portfast
I will remove from trunk links:
spanning-tree portfast
Thanks alot.

Etherchannel two cisco 3750 stacks for iscsi?

I have two sites connected by 96 strands of fibre. At each site I have an IBMv7000 relicating to the other one. For iSCSI traffic I have two Cisco 3750 switches, each are in 2 switch stack.
SAN A                         Fibre Link                          SAN B
        |                                                                        |
Cisco Stack A =========================Cisco Stack B
        |                                                                        |
        |                                                                        |
iSCSI Clients                                                       iSCSI Clients
My question: Is it ok to connect the the two stacks with etherchannel using the fibre links? Will is provide the necessary redundancy, if one of the interfaces goes down?

What model numbers of 3750 are you using?
What is the distance between the stacks as this will dictate your fiber run modules.

SFP change on Cisco 3750-X 24S

Hello,
I have a Cisco 3750-X 24S equipped with GLC-GE-100FX optical module to provide 100Mbps connectivity to workstation. I have to migrate the workstation NIC to 1 Gbps and, after that, I have to replace the 100base-FX SFP with the 1 GB SFP.
Wich initial configuration on switch port allowm me to replace the SFP without any reconfiguration on the switch port?
Thanks
Gabriele

Paolo is correct in that you do not need to change the configuration for the switch to recognize the SFP.
However some IOS versions and hardware platforms do require you to manually configure the interface speed (even though a fiber SFP only operations at a fixed speed). Check the current port configuration. If it has "speed 100", be sure to change it to "speed 1000".
Hope this helps.

Connect Cisco 3750 with Fiber

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