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songwa
Cisco Employee
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12-25-2024
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vpc peer-gateway
07-20-2015
当起了peer-gateway之后, vpc设备收到目的mac是gateway mac的话,直接就转发了,不需要经过peer link传到对端(否则可能会由于vpc的防环机制导致数据包drop)。连接L3层设备到vpc:可能出现的问题route1 想要访问sw1, 假设下一跳是7k1.但是route1 到7K得先经过portchannel hash。如果经过portchannel hash到7K2上面,这样就得经过peer-link到达7K1了。 然后7K1想要从上连的vpc转发的时候,因为vp...
当peer-link失效后的处理流程:
07-20-2015
peer-link失效之后,vpc是swtich会检查自己是主还是备。如果是主的话,直接转发数据。如果是备,开始做hold time时间的等待,之后5s内(keepalive 超时),则被设备认定主设备失效了。备设备变成主。如果在keepalive timeout时间内可以收到keepalive消息,则双活。备设备把所有的vpc port都down掉。等待peer-link的恢复。这时候(被设备因为peer-link down而把vpc port fown掉),如果主设备down了,流量整个都会...
vpc reload restore and auto-recovery
07-20-2015
vpc初始状态:1 peer-link起来之前一定要把 peer-keepalive 同步成功,必须被对端识别。 peer-keepalive识别是peer-link起来的必要条件。2 所有vpc控制层面的报文 都是承载在CFS报文里面 通过peer-link传到对端。3 只有做完一致性检查之后,vpc才能起来vpc reload restore:(只处理以下情况)如果在2台vpc重启的过程中,如果其中一台设备起不来,会导致整个vpc都起不来(keepalive同步不了,peer-link起不...
VPC peer-switch base introduce
07-20-2015
peer-switchpeer-switch主要把2端设备生成树的优先级做成一致,2台设备都会认为自己是根,都会发送bpdu。当主设备失效的时候,备设备会一直发送bpdu。不会有中断过程。当active恢复的时候,备设备的角色因为没有变化,也不会有影响。需要用相同的mac地址(用vpc的system mac地址替代本地mac)作为根的mac地址,这样才能保证传输的bpdu是一样的。当vpc设备出现问题时,可能有2个地方stp会导致业务中断:1 当active失效的时候,备设备可能由于自身原因导致...
N5K // Basic LACP troubleshooting
06-17-2015
Troubleshooting LACP issues这里有一些非常基本的故障排除步骤LACP(port-channels)。Config guide:http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli_rel_4_0_1a/CLIConfigurationGuide/EtherChannel.htmlProblem 1: 客户不能做LACP,提示以下报错。24...
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[原创]Sharing Explanation of Modes in "show ntp peer-status"
03-28-2018
顶。紫薯布丁
第九期【TS Open Day】基于Nexus 7000 F2/F2E 板卡的input discard的排错
12-18-2015
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[案例分享] 误配LACP portchannel号会怎样?
07-20-2015
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[分享] N5K vPC配置案例
05-25-2015
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生成树环路的检测与防护
04-16-2015
zan
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Community Statistics
Member Since
07-16-2014
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blgao
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