Course Content
Packet Forwarding
0/2
Network Device Communication
Forwarding Architectures
Spanning Tree
An overview of how switches become aware of other switches and prevent loops.
0/2
Spanning Tree Protocol Fundamentals
Rapid Spanning Tree Protocol
Advanced Spanning Tree Tuning
0/2
Spanning Tree Topology Tuning
Additional Spanning Tree Protection Mechanisms
Multiple Spanning Tree Protocol (MST)
0/1
Multiple Spanning Tree Protocol
VLAN Trunks and EtherChannel Bundles
0/3
VLAN Trunking Protocol (VTP)
Dynamic Trunking Protocol (DTP)
EtherChannel Bundle
IP Routing Essentails
0/4
Routing Protocol Overview
Path Selection
Static Routing
Virtual routing and forwarding (VRF)
EIGRP
0/4
EIGRP Fundamentals
EIGRP Path Metric Calculation
EIGRP Failure Detection and Timers
EIGRP Route Summarization
OSPF
0/4
OSPF Fundamentals
OSPF Configuration
OSPF Default Route Advertisement
Common OSPF Optimizations
Advanced OSPF
The (OSPF) protocol scales well with proper network planning. IP addressing schemes, area segmentation, address summarization, and hardware capabilities for each area should considered when designing a network.
0/6
OSPF Areas
OSPF Link-State Announcements
Discontiguous Networks
OSPF Path Selection
OSPF Routes Summarization
OSPF Route Filtering
OSPFv3
0/3
OSPFv3 Fundamentals
OSPFv3 Configurations
IPv4 Support in OSPFv3
BGP
0/4
BGP Fundamentals
Basic BGP Configuration
BGP Route Summarization
Multiprotocol BGP for IPv6
Advanced BGP
0/6
BGP Multihoming
BGP Conditional Matching
BGP Route Maps
BGP Route Filtering and Manipulation
BGP Communities
BGP Path Selection
Multicast
0/5
Multicast Fundamentals
Multicast Addressing
Internet Group Management Protocol
Protocol Independent Multicast
Rendezvous Points
QoS
0/5
The Need for QoS
QoS Models
Classification and Marking
Policing and Shaping
Congestion Management and Avoidance
IP Services
0/3
Time Synchronization
First Hop Redundancy Protocol
Network Address Translation
Overlay Tunnels
0/4
Generic Routing Encapsulation (GRE) Tunnels
IPsec Fundamentals
Cisco Location/ID Separation Protocol (LISP)
Virtual Extensible Local Area Network (VXLAN)
Wireless Signals & Modulation
0/2
Understanding Basic Wireless Theory
Carrying Data over a Wireless Signal
Wireless Infrastructure
0/3
WLAN Topologies
Leveraging Antennas for Wireless Coverage
Pairing Lightweight APs and WLCs
Understanding Wireless Roam and Location Services
0/3
Roaming Overview
Roaming Between Centralized Controllers
Locating Devices in a Wireless Network
Authenticating Wireless Clients
0/4
Open Authentication
Authenticating with Pre-Shared Key (PSK)
Authenticating with EAP
Authenticating with WebAuth
Troubleshooting Wireless Connectivity
0/2
Troubleshooting Client Connectivity from WLC
Troubleshooting Connectivity Problems at the AP
Enterprise Network Architecture
0/2
Hierarchical LAN Design Model
Enterprise Network Architecture Options
Fabric Technologies
0/2
Software-Defined Access (SD-Access)
Software Defined WAN (SD-WAN)
Network Assurance
0/6
Network Diagnostic Tools
Debugging
NetFlow and Flexible NetFlow
Switched Port Analyzer (SPAN) Technologies
IP SLA
DNA Center Assurance
Secure Network Access Control
0/3
Network Security Design for Threat Defense
Network Access Control (NAC)
Next-Generation Endpoint Security
Network Device Access Control and Infrastructure Security
0/5
Access Control Lists (ACLs)
Terminal Lines and Password Protection
Authentication, Authorization, and Accounting (AAA)
Zone-Based Firewall (ZBFW)
Control Plane Policing (CoPP)
Virtualization
0/2
Server Virtualization
Network Functions Virtualization
Foundational Network Programmability Concepts
0/6
CLI
Application Programming Interface (API)
Data Models and Supporting Protocols
DevNet
GitHub
Basic Python Components and Scripts
Introduction to Automation Tools  
To provide a high-level overview of some of the most common configuration management and automation tools that are available.
0/3
Embedded Event Manager (EEM)
Agent-Based Automation Tools
Agentless Automation Tools
ENCOR Course
About Lesson

Virtual Routing and Forwarding

the creation of logical routers on a physical router (VRF)

  • Virtual routing and forwarding (VRF) is a technology that creates separate virtual routers on a physical router. Router interfaces, routing tables, and forwarding tables are completely isolated between VRFs, preventing traffic from one VRF from forwarding into another VRF.
  • All router interfaces belong to the global VRF until they are specifically assigned to a user-defined VRF.

Virtual Routing and Forwarding

The global VRF is identical to the regular routing table of non-VRF routers:

  • Every router’s VRF maintains a separate routing table; it is possible to allow for overlapping IP address ranges.
  • VRF creates segmentation between network interfaces, network subinterfaces, IP addresses, and routing tables.
  • Configuring VRF on a router ensures that the paths are isolated, network security is increased, and encrypting traffic on the network is not needed to maintain privacy between VRF instances.

 

 

The creation of multiprotocol VRF instances requires the global configuration command vrf definition vrf-name. Under the VRF definition submode, the command address-family {ipv4 | ipv6} is required to specify the appropriate address family. The VRF instance is then associated to the interface with the command vrf forwarding vrf-name under the interface configuration submode.   The following steps are required to create a VRF and assign it to an interface:

  • Step 1. Create a multiprotocol VRF routing table by using the command vrf definition vrf-name.
  • Step 2. Initialize the appropriate address family by using the command address-family {ipv4 | ipv6}. The address family can be IPv4, IPv6, or both. Step 3. Enter interface configuration submode and specify the interface to be associated with the VRF instance by using the command interface interface-id.
  • Step 4. Associate the VRF instance to the interface or subinterface by entering the command vrf forwarding vrf-name under interface configuration submode.
  • Step 5. Configure an IP address (IPv4, IPv6, or both) on the interface or subinterface by entering either or both of the following commands: IPv4 – ip address ip-address subnet-mask [secondary] IPv6 – ipv6 address ipv6-address/prefix-length   Table 6-5 provides a set of interfaces and IP addresses that overlap between the global routing table andthe VRF instance.

 

 

Other useful information:

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