Switches, Hubs, and Modems
cancel
Showing results for 
Search instead for 
Did you mean: 

network design - which protocol to choose?

MullT
Frequent Advisor

network design - which protocol to choose?

Hi,

on the attached jpg file you can see a designed backbone or core network.
The 4 core buildings A,B,C,D are connected within a city WAN. Each of them is connected twice. Also each of the routers belong to the same IP subnet. speed is 1gbit/s everywhere.
The network has 2 firewalls at the end and 2 connection to the ISP with BGP.

The goal is to have load balancing as far as possible.

So which protocols would you use for this purpose?
3 REPLIES
Igor Ybema
Advisor

Re: network design - which protocol to choose?

Use VRRP combined with MSTP on the sites A,B and C on the routers connected to the city WAN. Configure this only on the 'edge' direction. The devices behind these routers (not connected to the city WAN) should/could be simpel level2 switches with MSTP enabled. All clients/servers connect to these switches.

Run OSPF on the city WAN connected routers. If possible run two separate VLAN's (call them routing lan 1 and 2) on the city WAN. Each router in each site connect to either VLAN 1 or either VLAN 2. If not possible (city WLAN is one big subnet), also run MSTP on this.

On the devices connected to the firewall originate the default route (0.0.0.0/0) into OSPF.
MullT
Frequent Advisor

Re: network design - which protocol to choose?

Hi,

thanks for your answer.

>Use VRRP combined with MSTP on the sites >A,B and C on the routers connected to the >city WAN.

So, you se no possibility to go for real load balancing with all connected routers?

>Configure this only on the 'edge' >direction.

Can you please clarifiy?

>The devices behind these routers (not >connected to the city WAN) should/could be >simpel level2 switches with MSTP enabled. >All clients/servers connect to these >switches.

ok


>Run OSPF on the city WAN connected routers.

ok

>If possible run two separate VLAN's (call >them routing lan 1 and 2) on the city WAN.

hm, now I have 1 VLAN, imagine the picture without redundancy, that´s how the situation is now.

>Each router in each site connect to either >VLAN 1 or either VLAN 2. If not possible >(city WLAN is one big subnet), also run >MSTP on this.

So it´s better to have 2 VLANs?

>On the devices connected to the firewall >originate the default route (0.0.0.0/0) >into OSPF.

ok
Igor Ybema
Advisor

Re: network design - which protocol to choose?

>So, you se no possibility to go for real >load balancing with all connected routers?

It still is real loadbalancing. However you always must choose the right protocol on each router dependend on how your clients connect.

> Can you please clarifiy?

Towards the clients.

> So ità ´s better to have 2 VLANs?

Yes because you then create a 'blue' network and a 'green' network seperating problem zones. Also it saves you from using mstp in the city wan.