Solved

How to configure reduantant DATA link Connection in site to site

Posted on 2014-02-21
5
284 Views
Last Modified: 2014-08-19
We have a direct Dark Fiber  DATA connectivity  between our HQ and branch. Also our ISP have given us Fiber DATA link  as their free service. Now we want configure both DATA link as redundant i.e. if something goes wrong with our own direct data link, we want automatically switch to our ISP's  data link without any need of user interaction.

The switches used on both sides are catalyst 2960S with MMD SFP connectors.  The internet is over the fiber and terminated at our branch office and it is been configured through the DATA link to the HQ
0
Comment
Question by:Zacharia Kurian
  • 3
  • 2
5 Comments
 
LVL 9

Expert Comment

by:ffleisma
ID: 39876349
the best way to do it is by making the two links into L3 and run a dynamic routing protocol over the links.

dynamic routing protocol ensures automatic failover if loss of one circuit happens. as added option, you might want to consider unequal cost load balancing (EIGRP), what this basically means is that if you have two paths with unequal cost (bandwidth path), the routing protocol will load balance between the two links depending on each link capacity.

the problem is you are using an L2 switch only connecting both sites, so L3 solution will not work. so basically you'll have to relay on L2 redundancy using spanning-tree.

can you you give a description of your setup, how are subnet and VLAN in place? i'm assuming currently you are just trunking the connection between sites and VLAN traverse from one site to the other.

do you have a core gateway in one site or both which handles the intervlan routing?
0
 
LVL 9

Author Comment

by:Zacharia Kurian
ID: 39880196
The site A (where the internet from ISP is been terminated) has CISCO LAN router with 3 different sub nets. The site doesn't have any L3, rather L2 Switches only.

The Site B (head office) has L3 and L2 switches (D Link). running on 4 different sub nets.

Both site are inter VLAN routed. I am attaching the current config files from our CISCO L2 switches that are used for DATA link. In the site A config, there are 3 VLANS (Management, Internet, and DATA), where internet VLAN is connected to ISP's Internet Router.
192.168.20.40-Site-A.txt
192.168.20.30-Site-B.txt
0
 
LVL 9

Expert Comment

by:ffleisma
ID: 39880212
can you share a diagram for your setup.

as far as i can see on the configuration you got

3 VLANs, can you identify which is the Internet, DATA, Management?

VLAN20
VLAN100
VLAN200

What I would like to identify where is the default gateway for each VLAN. if you can share a diagram and identify the physical connections between sites (Dark Fiber & ISP fiber) and the internet router, that would be easier for use to understand the current setup
0
 
LVL 9

Author Comment

by:Zacharia Kurian
ID: 39880557
The configuration details are from the existing L2 switches used for DATA Link Only.
The following are the details of them in addition to our LAN setup at each sites.

VLANs in the DATA Link L2 Switches: VLAN 20 & 100 are in switch port mode access and VLAN200 is in trunk mode.

VLAN20 - management VLAN (accessing the router)
VLAN100- Internet
VLAN200 - Data.
................................................

Site A:
VLAN100 is connected to ISP's Internet Router. (internet is been terminated at site A)
VLAN200 is connected to our LAN Router.
...........................................................................
Site B:
VLAN100 is connected to our Front End firewall.
VLAN200 is connected to our DLink L3 Switch.
......................................................................................
Other Inter VLAN/Routes Details:

CISCO LAN router at Site A- has 3 different SUB nets (static route)

D Link L3 switch at Site B- has 3 different VLANS.

The default gate way for the CISCO LAN router and D Link L3 switch is 192.168.20.1/24
............................................................................................................................................

Hope all these details would help you.
0
 
LVL 9

Accepted Solution

by:
ffleisma earned 500 total points
ID: 39880712
based on what i understand, here is how i see your network

site-site
correct me if i got any information wrong

i noticed you have internet circuit at site a (remote branch) while firewall is at site b, is there a reason for this?

The default gate way for the CISCO LAN router and D Link L3 switch is 192.168.20.1/24

so who is 192.168.20.1? i noticed .20 is switch a, while .30 is site b

interface GigabitEthernet0/1
 switchport trunk allowed vlan 20,100,200
 switchport mode trunk


i only see one interface configured as trunk on both switch, is the the Darkfiber connection? Where is the fiber data link from your SP connected?

CISCO LAN router at Site A- has 3 different SUB nets (static route)

static routing to where? and also, why is there a LAN router at site A, is there a WAN circuit terminating to this or you have placed a router to primarily do routing?

Lastly, which device is configured as the default gateway for site A users/subnet VLAN and which device is configured as the default gateway for site B users/subnet VLAN

I really apologize for my confusion but you have a very confusing network design.
site-site.PNG
0

Featured Post

Highfive + Dolby Voice = No More Audio Complaints!

Poor audio quality is one of the top reasons people don’t use video conferencing. Get the crispest, clearest audio powered by Dolby Voice in every meeting. Highfive and Dolby Voice deliver the best video conferencing and audio experience for every meeting and every room.

Join & Write a Comment

#Citrix #Citrix Netscaler #HTTP Compression #Load Balance
As companies replace their old PBX phone systems with Unified IP Communications, many are finding out that legacy applications such as fax do not work well with VoIP. Fortunately, Cloud Faxing provides a cost-effective alternative that works over an…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're interested in additional methods for monitoring bandwidt…

708 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now