Nexus

關于N7K的Fabric module的幾個問題說明：
1.Fabric 1遷移到Fabric 2時，必須在Cisco NX-OS 6.0(x) or a later release；
2.N7009不支持Fabric 1；
3.Fabric 1在線遷移到Fabric 2時，必須在12小時內完成，否則有系統信息提示，原文如下：When upgrading fabric modules, you must replace all of the Series 1 fabric modules in the switch with Series 2 fabric modules within 12 hours or you will see a syslog message that reminds you to complete the upgrade.
4.Fabric 1離線遷移到Fabric 2時，在兩個模塊共存時啟動交換機，思科官方給出了兩種截然相反的說法，原文如下：
You can replace a Series 1 fabric module with a Series 2 module in the Cisco Nexus 7010 and 7018 switches during operations, but while there is a mix of fabric module types, all of the fabric modules perform as Series 1 fabric modules. If you power up a switch with two types of fabric modules installed, only the Series 1 fabric modules will power up. To utilize the Series 2 fabric module capabilities, all of the installed fabric modules must be Series 2 fabric modules.
If you power up a switch that has both types of fabric modules installed, only the Series 2 modules power up. If you need the Series 1 modules to power up, you must first power off all of the Series 2 modules before the Series 1 modules can power up.

關于I/O模塊與Fabric的關系中，在培訓中提到如果采用F2的I/O模塊，需要5塊Fabric 2的模塊，這里需要說明幾點：
1.如果采用單塊F2的I/O模塊，可以只配置2塊Fabric 2的交換矩陣達到1+1的冗余，而不需要考慮是否線速，因為同一F2模塊的不同端口之間數據傳輸不需要經過交換矩陣；
2.基于上面這點，I/O模塊與Fabric的關系，不是說沒有Fabric就不能使用I/O模塊或I/O模塊啟不來，而是不同I/O間的數據傳輸需要多大的帶寬。
3.M1千兆I/O模塊因為連接背板帶寬是40Gbps，雙向80Gbps，所以必須有一塊Fabric 1模塊正常工作，否則不能工作。