We have set up two cisco 6509 VSS switches with sup 720 in each. both Tengig ports on each sup 720 are conectected each other and one port on each 16-port 10gig card is connected eachother to achice VSS as topology daigram attached.VSS is working fine, but if one sup fail on 6509-2 its loses the whole that switch, also when adding one port on each 16port 10g card into VSS ,we have to issue "no h-w moudle oversub" command on globle per slot base, this then means that remaing 15 ten gig ports on these cards will not use for normal traffic. ( if we try to configure its say ports in over sub mode )
1- How we can achive full redundency if one sup fails.
2- How can we use remaining 15 ten gig port for normal traffic.
Correct, and that is the expected behavior for VSS.
And you are correct on devices/services behind the VSS, they should be dual homed (NIC teaming, MEC, etc.).
That's answer my question 2, but I am still not sure about question1.Lets say my sup fails in switch 2, is there any way, that all the other cards in different slots on switch2 will still operational but handled by sup in switch 1? in VSS pair as shown in my topology .
When the Sup fails the entire switch is dead and NONE of the ports or cards on the dead switch can be managed by the other Sup, that is why in a server farm environment you should always connect your important servers via 2 NICs to 2 different VSS switches, this way you have NIC redundancy and also switch redundancy.. Think about the Sup being the brain, when there is no brain there is no body.