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 […]
In this topic, we are going to proceed with basic vPC configuration on NX-OS. Let’s review what we would need upfront before the configuration. We would need L3 connectivity for Peer Keepalive. For example, the management interface. We would require to enable vPC and LACP features. LACP must be used on all member interfaces as […]
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 […]
In this post I am going to discuss about different network architecture: the traditional campus design, then Spine-Leaf (AKA Leaf-and-spine architecture) and what problems the spine-leaf network design addresses. Classic Three-Tier Architecture You can have a flat network design with a large broadcast domain wherein all network equipment, PCs, printers, APs, connects to each other […]
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 […]
BGP Overview Border-Gateway Protocol (BGP) is an extremely scalable routing protocol which gives you a lot of control to choose the best route. It is a path-vector, which unlike OSPF where routers individually run SPF algorithm on their Link-State Database, it advertises the routes to the network. BGP connects two autonomous systems (AS) to teach […]
OSPFv2 Overview With Open-Shortest Path First (OSPF) as a Link-State routing protocol, routers build some information about the network. Those information include: Router ID Number of Links Links Descriptions Attached Router Subnet Mask Metric The routers multicast these information (Link State Advertisement or LSA) to the segment. As a result, all routers in the same […]
STP Features In this section we will discuss on different improvement which added to the Rapid spanning-tree. In particular we talk about: Convergence Optimization Edge Port STP Filters BPDU Filter BPDU Guard Root Guard Unidirectional Link Detection Loop Guard Bridge Assurance Convergence Optimization Spanning-Tree Edge Port This is equivalent of PortFast feature with Common Spanning-Tree. […]
Elissa Garlin
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