Learn how to a build a cloud-first strategyRegister Now

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 590
  • Last Modified:

Redundant NICs with Redundant Cisco Switches

If I understand we can have Computers with 2 NIC teamed together to form one logical Network Adapter with one IP address. We can connect each Physical NIC to 2 separate ports in 2 separate cisco switches (SW1,SW2), but the ports should belong to the same VLAN.

This way Cisco Switches Redundancy is taken care by STP and Computer network connection redundancy is taken care by the connected 2 NICs to 2 separate ports in 2 separate cisco switches.

OK.. the 2 NICs that have one logical IP address must be connected to the same VLAN located in 2 different switches.
So what would be the Default Gateway of the computer Network adapter? is it going to be the VLAN interface created on switch1 or VLAN interface created on Switch2 ??

Thanks

0
jskfan
Asked:
jskfan
  • 10
  • 6
  • 5
6 Solutions
 
irweazelwallisCommented:
surely the default gateway of the VLAN should be the same no matter what the switch i.e. pointed at your core switch
0
 
jskfanAuthor Commented:
So we can in the same network  2 vlan interfaces in 2 different switches with the same IP addresses ??
0
 
irweazelwallisCommented:
in a standard network topology your core switch would have the default gateways for each VLAN and any switches that you add that VLAN onto would know thats where to send the traffic.
Therefore any server/equipment that you put in any given VLAN will always have the same default gateway.

If you are stretching the VLAN across physical sites it gets a bit more complicated
0
Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

 
Don JohnstonInstructorCommented:
>We can connect each Physical NIC to 2 separate ports in 2 separate cisco switches (SW1,SW2),

You can only do this with stacked switches, 6500's using VSS or Nexus switches.  Otherwise all links from the teamed NIC must connect to the same switch.

>but the ports should belong to the same VLAN.

Either the same VLAN, or a trunk that allows the same list of VLANs.

0
 
jskfanAuthor Commented:
can you please paste a simple network diagram-like that will show the NICs with switches redundancy connections.
 
0
 
Don JohnstonInstructorCommented:
Okay. How's this?
topology.jpg
0
 
jskfanAuthor Commented:
so the server is connected to the same vlan number or name on 3 switches, the network adapter will have one IP for the DG, which should be the IP of a Vlan interface.
now the IP of vlan interface will be the one on SWA,or SWB,or SWC ??

Or are we going to have the same vlan interface created on 3 switches ???
0
 
Don JohnstonInstructorCommented:
>so the server is connected to the same vlan number or name on 3 switches,

Yes.

>the network adapter will have one IP for the DG, which should be the IP of a Vlan interface.

Yes. Or a router on that same IP network.

>now the IP of vlan interface will be the one on SWA,or SWB,or SWC ??

When you create a stack (like in this example), there really is only one switch. It's just made up of three physical switches. But there's only one config (and it encompasses all three switches).

0
 
jskfanAuthor Commented:
have not heard of a stack before...
does it have a different name other than stack.

0
 
irweazelwallisCommented:
the default gateway for the VLAN should sit on the core switch - the 6500 shown in the diagram nicely drawn by @donjohnston.

the VLNA name and Tag (ID./Number) will need to be the same - if i remember rightly from cisco you set up the VLANs on the core and it passes them down through all connected switches (i am used to HP's that don't do this so you have to set it up on each switch)
0
 
jskfanAuthor Commented:
The stack technology must be new Tech.
I wonder before the advent of Stack Tech, how is this done.

for instance I have 3550 switches, am I able to use Stack Technology?? Or do I need specif modules??
0
 
jskfanAuthor Commented:
http://www.cisco.com/en/US/products/hw/switches/ps607/products_tech_note09186a00800a2cac.shtml

I was looking at the link above. CIsco has the stacking Techno for the old switch models.
I guess you need to install GBIC on the switch.

For now, I want to achieve what I have posted in my question, when all I have in my network is the 3550 Switches with Fastethernet ports and a couple of Gig ports.
0
 
irweazelwallisCommented:
If you have a NIC team set up on a Server you need to plug them into the same switch.
Therefore they will have the same default Gateway.
0
 
jskfanAuthor Commented:
there is no redundancy if both NICs are plugged to the same switch.

0
 
irweazelwallisCommented:
no, but the teaming won't work properly if you plug it into different switches.

If you don't have the same VLAN with the same default gateway it won't work at all.

If you don't implement the stack then you won't get physical separation.
0
 
jskfanAuthor Commented:
<<If you don't implement the stack then you won't get physical separation. >>
So, I need to stick with the Stack ?
0
 
jskfanAuthor Commented:
is the stack configuration as simple as it is described here:
http://www.ehow.com/how_5464290_configure-cisco-stackwise.html
0
 
irweazelwallisCommented:
look about right. Haven't dealt specifically with the Cisco ones but the practise is about the same as the HP ones i have used
0
 
jskfanAuthor Commented:
Thank you Guys!
0
 
Don JohnstonInstructorCommented:
Cisco has had stacking for quite a while. The only hardware requirement (other than the switches that support it) is to connect the switches using the Stackwise cabling. Then it's just a couple of commands. Now, instead of managing and configuring 2, 3, 4 switches, you only manage one. But it has a bunch of ports.
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

  • 10
  • 6
  • 5
Tackle projects and never again get stuck behind a technical roadblock.
Join Now