Muhammad Khattak
Routing and switching specialist, CCNA certified, with extensive experience in network configuration and troubleshooting. Covers OSPF, EIGRP, VLAN management, and advanced routing concepts.
Link-State Routing Protocols Explained: How OSPF and SPF Work
Link-state routing protocols are also known as shortest-path first protocols. They maintain a complete picture of all the routers running a link-state routing protocol in the complete network. All routers running a link-state routing protocol originate information about themselves and their directly connected routers, links, and the state of those links as multicast messages. The...
Understanding the Shortest Path First (SPF) Protocol: Link-State Routing with Dijkstra’s Algorithm
In networking, efficient routing is crucial for data transmission across complex topologies. The Shortest Path First (SPF) Protocol, also known as Link-State Routing, uses Edsger Dijkstra’s SPF Algorithm to determine the optimal path for packets. Protocols like Open Shortest Path First (OSPF) and Intermediate System-to-Intermediate System (IS-IS) are prime examples of link-state routing protocols. These...
How to Advertise IPv6 Networks in RIPng
IPv6 Routing Information Protocol (RIP), also known as RIPng (RIP Next Generation), supports IPv6 addresses. It is a Distance Vector routing protocol that uses a hop count as a routing metric. After enabling IPv6 RIP, we also need to configure the advertisement of IPv6 RIP routes. We can display IPv6 RIP settings to verify the...
Propagating a Default Route in RIP: Step-by-Step Cisco Configuration Guide (Updated 2025)
Propagating a default route in RIP is a key feature of the Routing Information Protocol (RIP), a distance-vector routing protocol commonly used in small networks. It uses hop count as its metric and is suitable for CCNA-level studies, where understanding basic dynamic routing is key. A default route (0.0.0.0/0), also known as the gateway of...
How to Configure RIP Passive Interface
By default, the Routing Information Protocol (RIP) sends routing table updates every 30 seconds on all enabled interfaces. In RIP version 1 (RIPv1), these are broadcasts to 255.255.255.255, while RIP version 2 (RIPv2) uses multicasts to 224.0.0.9. However, updates should only be sent on interfaces connected to other RIP-enabled routers to avoid unnecessary traffic. This...
How to Configure Routing Information Protocol (RIP)
Routing Information Protocol (RIP) is a dynamic routing protocol that defines a way for routers to connect different networks using the Internet Protocol (IP) to share information about how to route traffic among these other networks. The Routing Information Protocol (RIP) uses hop count as a routing metric to determine the best path between the source and...
Fixed-Length Subnet Masking (FLSM) Exclusive Explanation
Fixed-Length Subnet Masking (FLSM) is the subnetting method where a network is divided into equal-sized subnets — every subnet uses the same subnet mask and therefore holds the same number of addresses. It’s the first subnetting technique most networking students learn, and it’s the natural starting point before moving on to Variable-Length Subnet Masking (VLSM),...
What is Classless Inter-Domain Routing (CIDR)
The IETF introduced RFC 1517 in 1993, introducing classless inter-domain routing (CIDR). The CIDR replaced the old classful network assignments. The classful address has now become obsolete due to the CIDR scheme. The CIDR network address is determined by the subnet mask instead of the value of the address’s first octet. The network and host...
Configure a Directly Connected Static IPv6 Route
The directly connected static IPv6 route is the best routing solution when CEF is not working on the router. In the old Cisco IOs before 12.0 versions, this is the best solution to avoid recursive routing. It is also the best in point-to-point networks. It is also the best alternative to using the next-hop IPv6...
How to configure Default Route
A default static route is a route that represents any network, not in the routing table of that router. Routers normally use default routes that are configured locally or learned from another router, using a dynamic routing protocol. A default route is used when there are no other routes that match in the routing table...