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I am working on VSS and I am trying to configure the VSS and i read that I need to enable sso as well as nsf and under routing protocol i need to configure nsf command ( router config mode )
can anybody explain about what is sso and nsf why is it required to enable before configuring vss
is it corelated with vss.
I am looking for perticular answer instead of reffering any cisco document for my understanding.
Please help me to understand these three concept.
and " vsl is used to transfer the control information in vss and to minimize we have MEC to carry data information so ingress and egress data transfer will happen on the same switch instead of using VSL if possible" but i get stuck-up with control information concept ............ what is it all about ?
can anybody give example of control information?
SSO = Stateful switchover , establish a relation of active / passive between 2 supervisor engines in a chassis to provide uninterrupted L2 functionality in case of a hardware failure. Imagine that you have 2 SUP in one chassis and one of them is the active one taking care of all operation, while the second one has the same configuration, but it is in standby mode. In case the the first SUP fails, the standby one take care of all operations without any interruption
NFS = Non-stop forwarding, works together with SSO, but this protocol offer support for L3 uninterrupted operations. Protocol like BGP, OSPF are NFS capable, able to detect a failure and react to have no operation interruption.
More about SSO+NFS here (operation and configuration details on a C6500, but the basics are the same on all platforms):
Now, VSS rely on SSO+NFS to offer High Availability services:
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