This is a problem that I came across in a client network.
Each server seemed to have the risk covered. The redundant card went into a different
switch (Sw2). The switch (Sw2) then connected to the primary switch (Sw1). All the
users on the lan connected via Sw1. All services leaving the campus went via Sw1.
In a nutshell if Sw1 broke. All the servers would see each other. No users inter nor
intra campus could work.
No load sharing could take place from any server. The hops to the users is more
direct via switch 1. Spanning tree would see to that one.
What to do. At least spread some of your users across each switch with the redundant
system. Where possible also connect each floor (campus access switch) to each switch
and set up preferences to allow traffic sharing of both network cards on the servers
and also the switches. This would provide safety all the way to the exit point of the
campus.
Beyond therre it becomes expensive.
It is all about risk management, disaster recovery and covering ones tail.
Just a thought.
Teunis,
Hobart, Tasmania
Australia
On Monday, December 18, 2000 at 09:33:33 AM, Dave Ng (Dragon) wrote:
> I've looked through the BCMSN book and also online and I've found info on
> redundant switches and routers at different layers in a network (Access,
> Distribution, and Core) but it seems that in every case (at least the ones
> I've seen) the redundancy does not flow down to the actual physical
> connection to an end node (specifically a server).
>
> Here's the problem I need to solve:
> I have a 3 servers in which I will put redundant NICs but do both NICs
> connect to the same switch? Then is that switch a single point of failure?
> Is there a way to connect each NIC to a different redundant switch and when
> a switch fails the other takes over? Can some one point me in the right
> direction? Perhaps a Cisco whitepaper or a book that deals with this.
>
> Thanks,
>
> Dave
>
>
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