ADVANCED SERVICES

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The goal of this post is to dive deep into vPC (Virtual Port Channel) which is a Cisco Nexus technology that allows links that are physically connected to two different switches to appear as a single logical Port-Channel to a downstream device. This eliminates Spanning Tree Protocol (STP) blocking, provides active-active link utilization, and offers [ Read More ]

This is a comprehensive list of essential ACI troubleshooting commands for controllers, leaves, and spines. APIC Controller Troubleshooting Commands Leaf Troubleshooting Commands in Cisco ACI Spine Troubleshooting Commands in Cisco ACI Packet Tracing Commands in Cisco ACI Debug & Trigger Commands in Cisco ACI Conclusion Troubleshooting Cisco ACI can be complex, but having the right [ Read More ]

What's a blog called "RouteLeak" without a Route Leaking post. As the name implies, route leaking implies leaking routes or importing/exporting network prefixes between VRFs or between the global routing table and a VRF segment. I will show you different methods to get it configured as follow: Route Leaking between Global and VRF table: Static [ Read More ]

With the evolution of SDN and Network Programmability, the NX-OS has come a long way with the integration of Linux based tools to support: Bash shell Python shell API access Linux containers for custom applications The Bash shell can be extremely powerful if you're proficient in it. I wanted to show you today a few commands [ Read More ]

Packet-tracer is a built in utility on the Nexus 9000 that's used to trace the path of a packet transiting the switch. This is extremely useful in terms of troubleshooting as this tool can confirm whether or not a specific traffic flow is traversing the switch. It's also useful to pinpoint packet loss as it [ Read More ]

Ethanalyzer is a NX-OS protocol analyzer tool based on Wireshark. Wireshark is an open source analyzer that decodes packets captured by libpcap (Capture Library). Cisco NX−OS runs on top of the Linux kernel, which uses the libpcap library to support packet capture. The Ethanalzyer is a command-line version of Wireshark that captures and decodes packets, [ Read More ]

Let’s illustrate how to configure PAT. At this point, if you are unfamiliar with NAT then please read this post here first. We will use the following topology to make our point… This topology above consists of a number of hosts (Host A, Host B, and Host C). The Service Provider has allocated a single usable [ Read More ]

Let’s illustrate how to configure Dynamic NAT. At this point, if you are unfamiliar with NAT then please read this post here first. We will use the following topology to make our point… This topology above consists of a number of hosts (Host A, Host B, and Host C). The Service Provider has allocated a pool [ Read More ]