redundancy configuration

[harinirina]

Hi everybody,

We'd like to implement redundancy in a network.

We'll use 2 Layer 3 switches, 3 Layer 2 switches and 2 routers connected to 2 ISPs.

Here attached the structure we'd like to implement.

HSRP and routing intervlan have been configured on the 2 layer 3 switches using standby ip on SVI.

We don't know what configuration to use when connecting routers to Layer 3 switches so that there's redundancy.

[luqmankondeth]

Sure you can. You can track any interface.

But I dont understand why you need to do it. Suppose a 2950 to switchb cable fails. You want the active gateway to be switch A now. Is that right? If you do it this way, even for the failure of one link between one 2950 and switch B, you will have the primary gw address moving from switch b to switch a for all the rest of the 2950s as well. Do you need this?

[harinirina]

Hi all,

Thanks for your reply.

We'll use hsrp and track link to routers.

Should 2 3750 be vtp server or one should be client?

One more question, in our case, does one of the isp stay in standby as long as one is active ?

if so, is there a way to do that 2 isps will work together?

[Joseph W. Doherty]

If you're using 3750s, suggest you stack them. If you do, you wouldn't need to use HSRP, although you still could. If supported on the 2950s, channel your two uplinks, one link to each 3750.

Route between the stacked 3750s and the WAN routers. Retain the dual links, again one to each 3750.

Orginate a default route from each WAN router when it has a good ISP connection.