hello I'm running N1K ver 4.0(4)SV1(3) and is connected to a Cat 4500 10GBase-SR port (module WS-X4606-X2-E with Onex converters). It happend that randomly (i.e every 2 week) the interface on N1K goes down (on the Cat 4500 side the the interface look like is up). what is strange is that even with shutdown and no shutdown command the interface doesn come up again (on N1K or on Cat4500 side). The only way to brig the interface up again is to restart the Vmware host. Even vem stop, vem start command from Vmware console doesn't work. Does someone had this issues ? suggestions ?
I've seen this kind of behaviour with Intel X520 DA2 10GbE Double port SFP+ cards installed in Dell R710 servers connected to Cisco Nexus 2232P switches. I couldn't find the root cause of the problem however one workaround I found that usually works is to issue those commands on the ESXi host itself (e.g. for vmnic4) :
esxcfg-nics -r vmnic4
ethtool -r vmnic4
I also reverted from LACP to standard channel group as it appeared to be more stable.
Good luck with this and don't forget to comment here if you find the root cause !
I am seeing a problem running 610 and 710hd Blades with ESX 4.1, 10gb Pass-though and Cisco Nexus switches. What we are seeing is the interface in ESX as showing up, on the pass-though ssh session the link is showing down and on the switch port for the 2k's the link is showing down. Performing a show port link from the ssh session on the pass-though modules seems to bring the link back up. Since the link is showing as up in ESX the VMs try to use that link as well as the Mgmt. port group. Anyone seeing this issue? We are not using MS NLB. This issue typically occurs after a server reboot or port reset. Any root cause to the above?
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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