About Spanning tree problem

[ejohnsin27]

I am a newbie for cisco switch.

I need a failover solution for both switch and AP Bridge link on both side.

I have 2 of location (Location A and Location B)

Location A

There has 3 set of cisco 2960 switch.

switch C is active switch

switch A is redundancy switch , it will be active when primary Wi-FI Link and switch C is failure.

Location B

There has 3 set of cisco 2960 switch

switch D is active switch

switch B is redundancy switch ,it will be active when primary Wi-Fi Link and switch D is failure.

I would like to use spanning tree protocol for this case.

As show my diagram, Can it achive failover for both switch and AP bridge link if I use this network design

Please help to comment

Thanks

John

[shamax_1983]

Hi John,

This is achievable. The best way to do this is, If you can control the client switches,

make the Client switch at location A, the root primary for the STP domain.

On the Client switch at location B, make the STP cost high on the port towards the Switch B.

Assuming all other STP settings are on default values,  this should block the link between LocationB client switch and Switch B. So all your traffic will take the path through switchC-SwitchD.

If the Wifi Bridge fails (AP3-AP4), the blocked link will start forwarding (make sure you are using rapid spanning tree for fast transition)

Now the most important thing in this design is to make sure that the Wifi bridges pass STP BPDU traffic, if they don't, this will not work.

Even if one of the switches fails on the active path, the backup path would still kick in.. 

Let me know how you go with this..

please rate helpful posts.. :)

[ejohnsin27]

Hi shamax,

Thank for your comment.

I would like to know what method to do this failover solution if access point can't pass STP BPDU traffic.

I will discard this network design if I have no access point that can pass the STP BPDU traffic.

Would you mind please suggest other failover solution for this case when I can't use STP.

Thanks

John

[shamax_1983]

Hi John,

in that case we may need to look at ways which we can use redundancy at Layer 3. Before going there I need to know what is in location A's internal network and what is in B. Including routers, subnets, and routing configuration, Gateway details configured on routers and user PCs etc.

Thanks