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Replacement of one N5k switch in vPC

An year back I was given an opportunity of replacing a N5K switch from vPC. Some of the physical connectivity was already there, here is what I performed from the start. Before this change I also referred Cisco documents but in documents there are several…

Configure and Troubleshoot GRE over IPsec VPN with NAT device in between

IPsec is a complex technology and it becomes more complex when a NAT device is in the path between a site to site GRE over IPsec VPN. In my production environment a problem escalated to me stating that site to site IPsec tunnel had not been coming up. Whe…

HSEC-K9 requirement on ISR G2 routers

I came across a scenario where a site was facing slowness, this site was having edge Cisco router 2951 configured with two GRE over IPsec tunnels towards the Data Center. One tunnel was being used as primary and other as secondary for data traffic. Users …

FEX 2000 AA Mismatch

We installed two nexus 5500 switches with different NXOS . N5K1 has 5.2.1.N1.4.bin and another N5k2 has n5000-uk9.5.1.3.N1.1a.bin. As soon as we connected the Nexus 2000 fex in to it , it gave error :   Error : AA Version Mismatch 101 FEX-TOP-Rack1 A…

Purpose of the Uninets blog

We are starting this blog series to help network professionals to overcome any network troubleshooting and design related issue which they face in their production environment on daily basis. We here at uninets are a group of working professionals having …