the cat 6509 has an reacheability issue with the vlan ip addresses. When trying to telnet or ping, it fails. However, when generate the traffic locally at the cat 6509 and ping back to the source, the source starts to communicate back to the 6509. Now all seems fine; but after couples of hours; the source will not be able to ping or telnet to the 6509 again. The upstream is a ASA firewall; it is permit such traffic.
It is only the InterVLAN ip address that has trouble, the hosts that connect to the 6509 on the same subnet are fine. the intervlan are running HSRP.
Anyone has idea what may cause this?