Hi, it is good to first take a look at LAN design and look at several scenarios and see what you can do with 2 Distribution/core 6509 switches in your lan.
You would want to take a look at the following link http://www.cisco.com/univercd/cc/td/doc/cisintwk/idg4/nd2012.htm#35141
or do a search on www.cisco.com technical documenst on Dual core and/or colapse core disign, this way you could build a good network design foundation and able to scale utilizing layered model such as Access, Distribution and Core guidlines and implementation.
For IP and intervlan routing redundancy you would want to implement HSRP.
One Switch would be your primary Coreswitch and the second switch would be your secondary core switch providing VLAN and routing dundancy as well.
Here is a link on HSRP.
http://www.cisco.com/univercd/cc/td/doc/cisintwk/idg4/nd2022.htm
Here is a quick exmaple of HSRP for network 10.168.13.0
Primary-Core-switch1
interface Vlan13
description Connection to 13th floor
ip address 10.168.13.2 255.255.255.0
ip helper-address 10.168.100.35
no ip redirects
standby 13 priority 110 preempt
standby 13 ip 10.168.13.1
Secondary-Core-switch2
interface Vlan13
description Connection to 13th floor
ip address 10.168.13.3 255.255.255.0
ip helper-address 10.168.100.35
no ip redirects
no ip route-cache
no ip mroute-cache
standby 13 ip 10.168.13.1
Hope this helps
Jorge
Jorge Rodriguez
