In the networks, we don’t have only single protocol. There are always many protocols and their interaction/synchronization is important. Otherwise, blackholes, routing or switching loops can occur or at least suboptimal routing/forwarding can be a problem.
Layer 2 Technologies
Vlan, VTP and Trunking are most fundamentals yet important topics in Layer 2 Networking.
GPON (Gigabit Passive Optical Network) is used to reduce the number of active switching nodes in the network design. Network Design Best practice in Campus networks and many Datacenter networks (Not Massively Scale Datacenters), is to use Three-Tier; Access, Distribution and Core network design. Although the design decision depends on the scalability requirements in the …
GLBP stands for Gateway Load Balancing Protocol. In this article, I will explain where GLBP is used , where it shouldn’t be used with the topologies.
Spanning Tree, Link Aggregation , VLAN and First Hop Redundancy protocols are used in Campus, Service Provider Access and Aggregation and in the Datacenter environment. There are definitely other protocols which are common across the Places in the Networks but in order to keep this article short and meaningful I choose these four.
IEEE 802.1aq Shortest Path Bridging (SPB) uses IS-IS as an underlying control plane mechanism that allows all the links in the topology to be active. In sum, it supports layer 2 multipath. SPB is used in the datacenter; however, it can also be used in the local area network. In this article, Figure-1 will be …
HSRP, VRRP and GLBP are the three commonly used first hop redundancy protocols in local area networks and the data center.
This is the third article in the layer 2 security series. If you didn’t read the first 2 articles; DHCP Snooping, and Dynamic ARP Inspection, I highly recommend you do as they are all related, specially DHCP Snooping.