New to Cisco so excuse my product ignorance. I'd like to design a network with 3*3750 as the Core/Distribution layer and a number of 2960 as the access layer.
I'm thinking of trunking the 3750s to create one virtual router. I'd like to use 2 uplink ports on each 2960 to connect to different routers to provide
1) increased speed
2) failover in case one router/port fails
Is this possible and briefly, how would it be done? I'm working with a vendor who'll do the actual config.
Based on your post it appears you are looking for two things.
Redundancy for your vlans/gateway for user traffic. You will want to use HSRP or a similar function. Here is how to configure HSRP.
Etherchannel uplinks to the core-distribution/distribution-access layers. For this you will want to configure port channels to utilize multiple links to increase bandwidth, and provide redundancy. Please see the following link to configure these.