Someone have any idea about what could be the reason I can't ping from one subnet to another in this scheme?
No ACL are defined in the 6509 and the sh ip route command displays both subnets as Directly connected.
I can ping IP addresses defined in the 6509: 172.20.X.2 and 172.20.Y.2 for example :
ping 172.20.X.2 source 172.20.Y.1 It works
ping 172.20.X.1 source 172.20.Y.1 It doesn't work.
PIM sparse-mode is enabled at 172.20.X.2.
Thanks in advance!