Network Connection Between Two Buildings Not Working

What have you tried so far?  Is fiber bad, can you swing to another pair by chance.

I tried to test the Netgear switch in building B. Given it a static ip address, and given two laptops static ip addresses also, the laptops can ping the switch, and two laptops can talk to each other.

If switching the fiber to another pair, is there any configuration to do after switching?

Does anyone know if there's any configuration needs to be done on the Enterasys switch for Gbic ports?

if you are just changing pairs nothing has to happen assuming, they are the same type of fiber.  multimode 50 micron for example to multimode 50 micron.  If you swung to single mode you would have a problem.

But from what you just said. you can get devices to talk across the fiber, but not the two switches.  Maybe hard code the speed and duplex so they dont have to negotiate that.  Was it working?

The two laptops and the Netgear switch are all in Building B. I can't ping them from building A.

Yes, the two fiber ends can talk to each other.

We have two vlans set up on the building a switch: vlan 1 for data 10.0.0.0, and vlan 2 for voip 10.10.0.0.

At this point, the netgear switch in building b has been set up with 2 vlans also. Data connection is working between building A and building B now. But the phones in building B are still not working. All the ports on the Netgear switch is configured to be on vlan1. When they are configured on vlan2, neither the phone or data was working.

Do you have any suggestions how to configure the netgear switch to make the voip working also?

Are the uplink ports set for trunking.  Not sure how on the netgear, but you should be able trunk the port on the netgear and the Enterasys to carry all vlans.

If all ports on the netgear are access ports on vlan 1, then the switch will only carry vlan 1.  Trunking allows multiple vlans to come across the port

Are your voip phones using the switch ports and the computer plugs into the phone? Or do the phones have their own port?

Have you enabled power on the phone ports?

Are you trunking vlan 1 & 2 over the link?

You cannot use dual-mode ports (data and voice vlans) over a media converter.  You CAN trunk the port though.

Both data and voip are working now, after change the ports to tagged for voip vlan.

But the connectivity is inconsistent. The POE switch has to be rebooted once in a while. We have a new POE switch which be on site soon.

How do I check the inconsistent connectivity issue?

Current configuration for the switches:

Building A: Enterasys B5G124-48P switch, trunk port (fiber connection to the switch) is on port 45. It has two vlans:
    vlan1 is for data 10.0.0.0, all ports are untagged.
    vlan2 is for voip 10.10.0.0, all ports are tagged.

Building B: Netgear GS724TP switch, trunk port (fiber connection to the switch) is on port 23. It has two vlans:
    vlan1 is for data 10.0.0.0
    vlan2 is for voip 10.10.0.0, all ports are tagged.

The two switched are connected by the fiber and fiber converters, nothing else. There are other POE switches in building A, and ISP router connects to one of the switches building A.

What layer 3 interface or upstream connection do I still need?

Another thing: while the connection in building B is down (neither data network connection nor phones working), I can still ping the Netgear switch at building A.

Configuration for Enterasys switch in Building A:

#ip
set ip address 10.10.0.2 mask 255.255.255.0 gateway 10.10.0.1
!

#system
set switch member 1 4
!

#vlan
set vlan create 2
set vlan name 2 "voip"
clear vlan egress 1 ge.1.2
set vlan egress 2 ge.1.1;ge.1.3-48 tagged
set vlan egress 2 ge.1.2 untagged
set host vlan 2
!

#port
set port vlan ge.1.2 2
!

#snmp
set snmp access ro security-model v1 exact read All notify All nonvolatile
set snmp access ro security-model v2c exact read All notify All nonvolatile
set snmp access public security-model v1 exact read All write All notify All non
volatile
set snmp access public security-model v2c exact read All write All notify All no
nvolatile
set snmp access public security-model usm exact read All write All notify All no
nvolatile
set snmp community :3fb03022e4966512343b511c263dcf1240739359ec6cad7d8c6277007e7e
0657521e0641967b150156:
set snmp group ro user ro security-model v1
set snmp group public user public security-model v1
set snmp group ro user ro security-model v2c
set snmp group public user public security-model v2c
set snmp group public user public security-model usm
set snmp user public authentication md5 :bb0e170a30224c985aa647152e85626b: encry
ption des privacy :bb0e170a30224c985aa647152e85626b:
set snmp view viewname All subtree 1
!

#spantree
set spantree portadmin  ge.1.45 disable
!



 VLAN: 1                 NAME: DEFAULT VLAN
 VLAN Type: Default
 Egress Ports
ge.1.1, ge.1.3-4, ge.1.6-7, ge.1.10-15, ge.1.17-23, ge.1.25-26, ge.1.28-40, ge.1
.43, ge.1.45, ge.1.48
 Forbidden Egress Ports
None.
 Untagged ports
ge.1.1, ge.1.3-4, ge.1.6-7, ge.1.10-15, ge.1.17-23, ge.1.25-26, ge.1.28-40, ge.1
.43, ge.1.45, ge.1.48

 VLAN: 2                 NAME: voip
 VLAN Type: Permanent
 Egress Ports
ge.1.1-4, ge.1.6-7, ge.1.10-15, ge.1.17-23, ge.1.25-26, ge.1.28-40, ge.1.43, ge.
1.45, ge.1.48
 Forbidden Egress Ports
None.
 Untagged ports
ge.1.2

Configuration for Netgear switch in Building B is attached.
NetgearSwitchConfig.pdf

Sorry I'm late.  Will look at this now.

Ok...

On switch A:

Computer/Printer ports untagged vlan 1
Phone ports tagged vlan 2
Port 45 should be tagged in vlan 1&2.

On switch B:

Same as above except Port 23 should be tagged vlan 1&2.

LAG ports are normally a collection of 2 or more ports that are treated as a single link.  In you scenario, you do not need a LAG as you are only connecting a single port between switches.

Let me know.

Thank you very much! I'll try it tomorrow morning.

The issue has been solved finally. There were a lot of crc errors on the Enterasys switch port, which pointed to a faulty hardware. A fiber Ethernet cable has been changed and that fixed the problem.

Thanks for all your help!