https://community.extremenetworks.com/t5/extremeswitching-eos/s4-with-1-io-module-and-1-fabric-module-expected-failure/m-p/59962#M1794 Hi Tino,<BR /> <BR /> As the S4 chassis needs at least one fabric module for operation, if a chassis is running with only a single fabric module and that fabric fails, all traffic through the system will stop forwarding. For this reason, the use of redundant fabric modules is recommended for these models.<BR /> <BR /> An IO module failure will not affect any other part of the system. Obviously any uplinks would need to be lags spread across multiple blades in order that they are not affected.<BR /> <BR /> Best Regards<BR /> Glyn<BR /> <BR /> Fri, 19 Feb 2016 18:02:00 GMT Straw__Glyn 2016-02-19T18:02:00Z https://community.extremenetworks.com/t5/extremeswitching-eos/s4-with-1-io-module-and-1-fabric-module-expected-failure/m-p/59961#M1793 Hi, <BR /> <BR /> I need to do some redundancy planning. On a S4 with 1 IO module and 1 fabric module what will happen if:<BR /> <BR /> 1.) The fabric module fails ?<BR /> Would the entire switch fail ?<BR /> <BR /> 2.) If the IO module fails ?<BR /> Would we only loose connections on the IO module?<BR /> <BR /> Apologies if this seems straight forward. I just need to make sure that the behavior I expect is what actually will happen.<BR /> <BR /> Thank you, Fri, 19 Feb 2016 15:29:00 GMT https://community.extremenetworks.com/t5/extremeswitching-eos/s4-with-1-io-module-and-1-fabric-module-expected-failure/m-p/59961#M1793 Tino 2016-02-19T15:29:00Z https://community.extremenetworks.com/t5/extremeswitching-eos/s4-with-1-io-module-and-1-fabric-module-expected-failure/m-p/59962#M1794 Hi Tino,<BR /> <BR /> As the S4 chassis needs at least one fabric module for operation, if a chassis is running with only a single fabric module and that fabric fails, all traffic through the system will stop forwarding. For this reason, the use of redundant fabric modules is recommended for these models.<BR /> <BR /> An IO module failure will not affect any other part of the system. Obviously any uplinks would need to be lags spread across multiple blades in order that they are not affected.<BR /> <BR /> Best Regards<BR /> Glyn<BR /> <BR /> Fri, 19 Feb 2016 18:02:00 GMT https://community.extremenetworks.com/t5/extremeswitching-eos/s4-with-1-io-module-and-1-fabric-module-expected-failure/m-p/59962#M1794 Straw__Glyn 2016-02-19T18:02:00Z