Subscribers use IGMP to join a multicast group. If the publisher also resides in the same network as the subscriber, it is sufficient. However, if the subscriber and the publisher are not in the same network, a multicast routing protocol must exist to route the multicast traffic down to the subscriber from the source. Cisco […]
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 […]
Data delivery models Let’s review what Multicast is by first looking into three other types of data delivery. Unicast: one-to-one transmission Broadcast: one-to-all transmission Anycast: one-to-nearest transmission Multicast is data transmission from one or a group of publishers to a group of subscribers. With that being said we will have different applications with IP Multicast […]
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). […]
Lab Introduction It is undeniable that during a learning process it would be helpful if we could deal with the examples of real-life challenges in order to commit to memory and put them into practice. For practicing in the realm of data transmission network. They help to simulate and emulate the traffic flow, configurations, related […]
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 […]
Installing Cisco Unified Communications Manager (CUCM) 14 Hi everybody, this is the first step-by-step tutorial on installing and implementing Cisco Unified Communications Manager (CUCM). I try to simulate different practical scenarios and valuable projects that any VOIP a specialist might confront the most the organizations and enterprise companies. Why CUCM? Well, I think the first […]
BFD Overview When a link fails, with routing protocols we need to wait until hold time or dead-interval expires then we recalculate the route to the destination. We could lower the hello packet as well as dead-interval timers to expedite the convergence. However, not only we are still talking about some seconds of downtime but […]
vPC and STP By default, only vPC primary switch (Verify it using show vpc role) sends and receives BPDUs on the member ports (even if the root bridge is the vPC secondary switch. Verify it yourself by show spanning-tree interface pomember detail | i sent on the secondary switch). Let’s imagine that primary devices goes […]
Elissa Garlin
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