I have two Catalyst 6513 switches connected by a two gigabit ethernet port channel trunk port. VLAN 5 exits on both switches. I have 4 routers connected to switch A on VLAN 5 and 3 routers connected to switch B on VLAN 5. Because, this routers are backbone routers i need to have all routers connected to both switches on VLAN 5 so if one switch fails i don´t loose any router. How can i have a backup or standby interface on VLAN 5 on the second switch? or, what other options may i have?