A multicast distribution tree (MDT) is the paths through the network from source to receive used to distribute multicast data traffic. There are two types of trees: Shortest Path Tree (SPT): this tree is also known as source tree which is the quickest path from the source to receiver. But it may require more states […]
Virtual Device Context (VDC) With Cisco NX-OS VDC you can divide a physical N7K series switch into multiple logical switches, it will have different management/control and definitely different data planes. By default all ports belong to the default VDC. From default VDC you can create other VDCs and/or jump to them (with command switchto vdc). […]
Double-Sided vPC Dual-sided vPC or Double-side vPC as known as back-to-back vPC or multilayer vPC is combination of multiple vPC layers. In double-sided vPC we have two layers of vPC pairs. Traditionally, our access layer switches are in vPC whose southbound links connect to servers. Their northbound links connect to aggregation layer who are also […]
IP Service Level Agreement (IP SLA) IP SLA allows you to probe different key performance indicators of the network such as reachability, latency, jitter, etc. For the purpose of CCIE Datacenter, we are only going to enable feature sla sender. In particular, I am going to explain the ICMP echo configuration. Frequency: The seconds between […]
In this section, let’s see vPC initialization process; then we will discuss on different failure scenarios: The minute you enable vPC feature, the switch sends UDP 3200 ping keepalive to establish connectivity with its peer. Once the connectivity established, the switch in turn enables CFSoE to synchronize the control plane and to carry PDUs for […]
After covering Port-Channel let’s know talk about virtual Port Channel (vPC). virtual Port Channel allows two NX-OS switches to provide a single port-channel to the downstream devices (Similar to VSS and Stackwise in Catalyst environment). Without vPC, STP blocks one of the ports. In addition, you don’t have high availability. Note that the downstream switch […]
Link Aggregation Port-channel is to NX-OS as EtherChannel is to Catalyst. Juniper calls it Aggregated Ethernet interface while Microsoft refers to NIC Teaming . In fact, all refer to the same concept of grouping couple of ports together in to a single logical interface. Above all, The main advantage of grouping some ports into a […]
Network Layer Jobs IP Routing One of the main roles of the Network layer is to forward packets between hosts. A host can send a packet to: Itself: Host can use it’s own interface IP or its loopback address to send a packet to itself. Same local network: When a host wants to send a […]
IS-IS Overview Intermediate system to intermediate system (Short for IS-IS) is an IGP link-state protocol which builds a link-state database. Like OSPF, It will the run the Dijkstra SPF algorithm to find the best path to the destination. IS-IS has an AD of 115 with Cisco NX-OS. Unlike OSPF, IS-IS does not run over network […]
Audiences: Candidates who want to prepare for CCIE Data Center (v3.0) Introduction to NX-OS Command Line In this section, we assume that you know how to connect to a NX-OS CLI via a terminal emulator program. Here is how we bootstrap our Nexus switch for the first time. If you skip Power On Auto Provisioning, […]
Elissa Garlin
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