There are several IBM Blade Centers with Cisco 3110X switches integrated into them (two stacked 3110X switches per Blade Center). These stacked switches are connected to 6500 VSS via Multiswitch EtherChannel - one 10 Gb link from each switch forming channel. With such configuration all blade servers (inside IBM Blade Center) are successfully reachable, even when manually shutting down one 10 Gb link in the etherchannel. But there are happening weird things when powering off one switch in the stack - this is done by the means of IBM Advanced Management Module (via web interface of AMM). There are different results of powering off one switch in the stack (this procedure was done on several switch stacks, and each):
1) After powering off one switch I can successfully ping servers inside Blade Center, but cannot telnet or ping any IP address of the switch (before powering off one switch everything was Ok)
2) After powering off one switch in the stack I can successfully ping switch, but can't ping servers inside Blade Center.
3) After powering off one switch in the stack I can neither ping switch nor the servers inside the Blade Center.
So what is the benefit of switch stacks while it behaves in such way? Please, help me solve that problem.
常见的数据中心之间通信均会采用运营商MSTP/OTN专线进行互联实现通信，由于长途线路价格昂贵通常我们需要最大化使用线路带宽，传统的网络传输中通常是尽力而为传输一旦突发流量较大就会发生线路拥塞的情况，从而影响业务正常通信传输。这时候我们可以采用Qos技术来实现数据中心思科设备之间关键网络流量保障，从而实现链路最大化利用。拓扑图场景如下：如上图，SW01是位于数据中心A的广域网接入Cisco Nexus 3048交换机，SW02是位于数据中心B的广域网接...
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