Network Optimization Challenge
Problem Description:You are the network administrator for a medium-sized enterprise that relies heavily on its network infrastructure for daily operations. The network consists of multiple Cisco route...
Blog Articles
Why do we need Link Local Address In the World of IPv6
IPv6 Link Local address is one of the most confusing topic in the world of IPv6. Because there is no equivalent address in the world of IPv4. The question that arises is what are the benefits of this ...
Cisco SD-WAN Cloud OnRamp for Multicloud on Cisco dCloud
Cisco SD-WAN Cloud On-Ramp for IaaS is a set of capabilities that extend the Cisco SD-WAN overlay fabric to a public cloud instance. This allows remote branches within the SD-WAN overlay fabric to lev...
What is the status of your devices' OSPF neighbors?!-Multi-Devices
In the previous blog, we saw how to retrieve OSPF neighbor status for a single device. Now we will apply the same logic but for multiple network devices using Netmiko.First of all ! the raw case witho...
What is the status of the OSPF neighbors of your devices?!!
Netmiko version – Case one device In this post, we will show how to use Netmiko to retrieve the state of a router's OSPF neighbors.
OSPF Disguised LSA Attack
The idea behind this kind of vulnerability is that per RFC 2328 Section 3.1: Two different instances of an LSA are considered identical if they have the same: • Sequence number • Checksum • Age (+/-...
The C9200CX Series Switches: Now with mGig and hVDC
The mGig and hVDC C9200CX switches expand the very popular line of Catalyst compact switches. Available in 4 different SKUs, these switches enable next generation WiFi 6/6E, as well as smart/sustainab...
Autopsy of Type-2 LSA - OSPFv2 vs OSPF
When moving from OSPFv2 to OSPFv3, there are many changes in the format of the LSAs Type, but the most known changes are: IP prefix informations are no longer carried in Type-1 LSA and Type-2 LSA, ...
OSPF Flood Reduction for Stable Topologies
By design, OSPF requires link-state advertisements (LSAs) to be refreshed as they expire after 3600 sec. When OSPF network is stable. The OSPF Flooding Reduction feature is used to reducing unnecess...
OSPF Type-1 LSA and the Link Type to detect Network Type Mismatch
The Type-1 LSA OSPF is the most important LSA among all the available LSAs. Because the informations carried in the Body.These informations are the collection states of Router's Links or interfaces.Th...
OSPF Hub - Spoke Design and Suboptimal Routing with Spoke as Transit
In this Hub and Spoke Design, the Hubs are acting as ABRs to interconnect the non-backbone areas where the spokes resides. Route Summarization helps to reduce the size of the LSDB and the Routing Tabl...
Cisco IOS XE 17.12.1 for Catalyst Switching
Cisco brings in its new software release IOS-XE 17.12.1 which offers a suite of new software features and introduces new hardware in Catalyst 9K portfolio. This is the Extended Maintenance Release (EM...
OSPF External Path Selection RFCs 3101 1587 1583 2328 OE1/ON1 OE2/ON2
OSPF External Path Preference with RFC 3101 Active OE1 vs ON1 routes By default, Cisco Router simplement RFC 3101. R1#sh ip os | i RFC Supports NSSA (compatible with RFC 3101) Supports Databas...
OSPF External Path Preference According to RFC
OSPF External Path Preference with RFC 3101 Active OSPF External Path Preference with RFC 1587 Active / RFC 1583 Active OSPF External Path Preference with RFC 1587 Active / RFC 1583 Inactive ...
Securing Enterprise with Catalyst 9000 MACsec Encryption
Discover how MACsec, a Layer 2 security protocol, can safeguard your enterprise campus network from unauthorised access and data tampering. We'll explore the seamless integration of MACsec into the po...
