"show interface" at the switch will show the ip address of the sc0 and the
vlan it belongs to.  Make sure that if the sc0 is in vlan 1 the ip address
is in the same subnet as vlan 1.  If the sc0 is in vlan 1 can you ping the
interface vlan 1 at the MSFC?  If it is and you can ping the interface vlan
1 of the MSFC, can you ping the interface vlan 2 of the MSFC? If not, "show
ip route" this will show a default route if it shows default/default you
have to set the default route of the switch to point to interface vlan 1 ip
address if the sc0 is in vlan 1.  For example:

     5509 ---ISL---6509 w/MSFC

5509:
sc0 vlan 2 10.2.2.2 255.255.255.0
default gateway 10.2.2.1

6509:
sc0 vlan 1 10.1.1.2 255.255.255.0
default gateway 10.1.1.1

MSFC:
interface vlan 1
ip address 10.1.1.1 255.255.255.0

interface vlan 2
ip address 10.2.2.1 255.255.255.0

When you ping the vlan interfaces at the MSFC did you ping the 6509's sc0? 
Can you ping it?  If the config is correct and the sc0 is in vlan 1 and it's
in the same subnet as the iterface vlan 1 and you still can't ping it, try
clearing the arp table of the MSFC.


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