[c-nsp] router-switch redundancy

Arturo Servin aservin at remoteconfig.net
Sun Aug 14 06:29:19 EDT 2005


    With legacy routers (3800, 3600, 7200, etc) you cannot unless you 
bridge, but the convergence times will be really high (30 seconds for 
SPT). If you are using L3 switches you can set up 2 differents FE/GE 
port to the same vlan. If you setup also RSPT or uplink fast it will 
convergen in less a second or two.

     You can also change the "switches" for L3 switches and run a 
routing protocol as OSPF or EIGRP between them and the routers. The 
converge will be very fast either.

-as

Mark Kent 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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>
>  
>


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