[c-nsp] router-switch redundancy

[John Neiberger]

One way to achieve this is to use fault-tolerant transceivers. You can
have extremely short switchover times in case of a failure of a
switch.

HTH,
John

On 8/13/05, Mark Kent <mark at noc.mainstreet.net> wrote:
> In more than a few places on the cisco web site they have
> diagrams like this:
> 
>            {Internet}
>             /      \
>            /        \
>        [routerA]   [routerB]
>         /   \       /    \
>        /     \     /      \
>       /       \   /        \
>      /         \ /          \
>     /           /            \
>    /           / \            \
>   /           /   \            \
>  -------------    ---------------
>  |           |    |             |
>  |  switch   |----|   switch    |
>  |           |    |             |
>  -------------    ---------------
> 
> designed so that either router can fail and things still work
> for the servers connected to the switches.
> 
> What I don't get about this is the two connections
> from each router into the same switch fabric.
> 
> In a simple world where you have a /24 with a bunch of servers
> plugged into the switches, how do you have two ports on one
> router in the same broadcast domain?
> 
> Thanks,
> -mark
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