I'm attempting to connect some switches in my IDF locations to my MDF switch via SFP.

The fiber connecting each IDF to the MDF is multimode, OM3. It connects to a LANscape housing in each location. From the housing, I'm trying to connect a fiber patch cable to the SPF module on the switch.

I managed to get ONE switch working in ONE IDF by using an aqua OM3 patch cable connected to a Ubiquiti module. The only way I could get that connection to work was with a multimode fiber converter in the MDF connected to a port on the switch. SPF would not work. I've tried various SFP modules, including an SPF+ 10G multimode, a Trendnet 1.25G multimode, a generic 1.25G multimode module, and even a couple single mode SFPs, just in case. I've tried aqua OM3 patch cables, orange OM1 patch cables, various LC to SC adapters, and some yellow single mode patch cables, again, just in case. I've tried just about every single combination of the above in some fashion.

On a second switch in a second IDF, even with a fiber converter in the MDF, I can't get a link. If I remove the converter from the first connection in the first IDF, I can't get a link with any combination of the above.

I am about to go insane with this problem. This should be straightforward and easy, but it's driving me nuts.

The contractor installing the actual fiber backbone has told me it's multimode fiber, OM3, 50 microns. I suppose that might be incorrect information, but I have had no issues or inconsistencies …

Hi
We are expanding our office so will need to install an additional switch in another room c20 feet away from the comms.  At the same time we are looking at replacing our existing switches.  

Currently have a hp 2910al poe+ 48 port serving as GW for hosts.  It routes to the local firewall and thereafter out tot he web via router.  We run two vlans for data and voice.  
We also have two other switches connected via ports on the 2910al.  These are HPv170 and 3com 2952, these run only data, no voice.

Looking for recommendations for specs and types of switches.  We like HP but would use any other.  Ideally have some form of resiliency and HA in the comms room and the same with the other switch in the other room.

Would modules be any good?

We also have STP disabled for our voice to work.

Thanks

Understanding uRPF Loose Mode /Strict Mode,

Let's say we have R1 connected on both of its 2 interfaces to R2 and R3
R1 interface IP address(192.168.12.1/24) connecting to R2
R1 interface IP address(192.168.13.1/24) connecting to R3

R2 interface IP address(192.168.12.2/24) connecting to R1
R3 interface IP address(192.168.13.3/24) connecting to R1

R2 has a loopback 0 with ip address 2.2.2.2/32

R1 has static route : Ip route 2.2.2.2 255.255.255.255 192.168.12.2

For test purpose I have created lopback 0 on R3 with the same IP address 2.2.2.2/32 as the loopback 0 on R2

With Strict Mode or Loose Mode configured, I can ping from R2 (source Loopback 0:2.2.2.2) to R1 (192.168.12.1)
I can see the ping replies. but I cannot ping from R3 (Source Loopback 0: 2.2.2.2) to R1 (192.16.13.1).
However when reading online, it states that with Loose Mode, R1 will accept packets from R3 and with Strict Mode it does not.
from my side, I still cannot see the difference between Strict/Loose Mode as both will cause Ping fails from R3 source loopback 0 to R1

Any clarification on this ?

Thank you

Hello,

I have a flat network with some unmanage switches and  1 firewall.

I would like to separate at least Workstations and Servers in different VLANS

Do i need Switches Layer 3 or i can use Layer 2 Switches?

What are the best fiber cable manufacturers?  There're so many online and price varies and lot.
Looking for LC/LC SM and MPO MM cables.  
Please advice.  I normally buy on Amazon.

Experts, I am looking for a paid CA Devtest Service Virtualization tutorial online. The tutorial offered by CA requires me to provide a company email address which I can't at the moment. Does anyone have information about any websites that offer the training? Any inputs appreciated.

Hi,

as attach file show， I have two firewalls, one is too old and could not support VRRP, but I want to make a backup route.

so I write two default route on Core switch:
ip route 0.0.0.0 0.0.0.0 192.168.1.1
ip route 0.0.0.0 0.0.0.0 192.168.2.1

I don't know if there will be problems.

if 192.168.1.1 is broken, the traffic will through 192.168.2.1?

Regards,
Kai

hi guys

I was hoping that you guys could help me with something. We have many stores across the UK. I am trying to do a revision of our network architecture. I have uploaded a very basic Visio diagram of what it looks like. Stores are connected via the MPLS to a datacentre which has our firewall and from which the internet breaks out. I have created Store A and this configuration is almost identical for all other stores. All stores have IP PDQ machines. The store network traffic goes from the PC's, Tills//PDQ's via the MPLS network to our datacentre and from there, it breaks out to the internet. PDQ's also failover to an analogue telephone line if there is an issue with the MPLS network.

We have additional internet lines at each store for other things such as footfall camera's and mobile devices which I have included on the right hand side. This is so that credit card information is going out of an entirely separate line in case of a breach. So of course, one issue we have is that if (this has not happened yet in the 4yrs I have been there) the internet side at the end of where the MPLS breaks out into the firewall and to the internet went down, then none of the 40 stores can transact properly. Well they can, but via the analogue phone lines which I think is just 20th century rather than 21st.

However, I am reviewing all of this and hoping that we can just reduce 2 to 3 internet lines into just one and introduce VLAN's and consolidate everything.

My questions …

Hello,

I have a Cisco network running 10/100/1000Mbps. Should I planning on upgrading it to 10Gbps, 40 Gbps, or 100Gbps? What would be involved? New switches, cabling? I would appreciate input from anyone who's also doing the same or planning on doing the same. I would like to know what devices, cables etc you are thinking of, your plan of attack and approximate costs.

Thank you so much in advance.

Dear Experts

We have been asked to deploy on premise mail server for which we are planning to go for zimbra network but before to that we have to design the network,  though this email server will be working for internal within main office and branch office as it is connected in mpls network but we also would like to send and receive mails to external domains following measures to be taken
1. if our server or internet goes down the sender mail should not get lost for us once the server or internet gets restored the mails should be delivered to our emails accounts.
2. our domain and ip reputation should be always good so that our messages gets delivered to the inbox on the recipient email
please suggest on how our email server to be configured have internal dns server and make it work as normal email server and for external we have to avail SMTP RELAY service with some service provider please suggest is this correct if not please suggest what service we have to avail for external email delivery with email security will be taken care.

Dear Experts

to setup new office what IP addressing is recommended as it is common to use 192.168.1.0/24 but I would like to go for something different and this network will have to be get connected over the VPN from other location and they may be using 19.168.1.0/24,  this new network yet to be setup will have internal dns and dhcp and leased line and mpls connectivity. the total users or end devices within this network will not be more than 75, I prefer other than 192.168.1.0/24 is there a recommend/best  practice in selecting a particular ip addressing for private lan network please suggest,  is it good to go with 192.168.0.1/24 or something like 192.168.100.0/24 or any other ip addressing recommended please suggest.

How to combine two subnets?
AM  Volunteer IT for church.  Have one wired network, one server (W12 running DHCP) on 192.168.0 subnet mask 255.255.255.0 with printer/copiers wired workstations connected thru POE switches to Zxyel Firewall/switch to Comcast.  File sharing and SQL databases on server.  Zyxel also splits off to VIOP phone system. Originally had some Dlink routers acting as Access points for wireless (worked, but campus not fully covered).

Independently, another volunteer got approval to purchase campus wide wireless.  Third party installed Ruckus wireless POE units (10, one a controller) on subnet 10.59.0 subnet mask 255.255.255.0 running separate DHCP for wireless side (one workstation is also connected to this subnet).  All Dlink routers were removed. Supposedly inherent to the Ruckus system is health checking and repair/restoration of the Ruckus access points without human intervention.  I have no manuals or training on the Ruckus wireless system.

Needless to say, workstations (wired or wireless) on one subnet cannot see across the subnets. i.e. file explorer does not show machines on other subnet and visa versa.  Found that if I enabled WINS on the 10.59.0 systems, I could then address the server by manually entering servername i.e. \\servername\sharename.  Believe there are issues of getting to SQL databased from a wireless workstation as this week had to connect a wireless laptop via ethernet to setup an application using a SQL database.  There was a…

If you have two Internet feeds with BGP attracting traffic to your site and one goes out - should that interfere with ongoing uploads?
Say I had 200 uploads via sftp to my site. Provider A does some maintenance but Provider B stays up. Traffic load drops to 50
uploads. Since the connections are TCP/SFTP I would think they would just pause and then continue once the available path became
available. Or is it the case that the reconvergence/hold down timers are likely just too long to keep most of those conversations
alive?