Cisco SD-WAN Firewall Step-by-step
Dec 28, 2021
In this blog post, we want to show how to enable a zone-based firewall on the Cisco SD-WAN platform. The example continues on the topology in the Direct Internet Access article. We introduced an additional site to demonstrate that the configuration applied doesn’t affect inter-site traffic.
Read MoreCisco SD-WAN Packet Capture
Nov 27, 2021
Packet capture provides a way of getting a copy of the packets traversing a router. This can be useful for troubleshooting purposes when you want to see if the packets are being received or sent by the router via the expected interface.
Read MoreCisco SD-WAN Direct Internet Access (DIA) Step by Step
Nov 20, 2021
SD-WAN deployments use the Internet as the transport to replace WAN networks traditionally designed to leverage centralized Internet access via the data center. Direct Internet Access (DIA) refers to the configuration when Internet-facing traffic breaks out directly from the branch router.
Read MoreCisco SD-WAN CLI vs. vManage Mode
Oct 2, 2021
Cisco SD-WAN devices can be either in vManage or CLI mode. In vManage mode, the configuration is performed on vManage and then pushed to the device. Local configuration changes are not allowed. In CLI mode, changes are performed locally on the device. vManage mode is the preferred and recommended option for most SD-WAN implementations. However, you can occasionally switch devices into CLI mode to perform specific tasks.
Read MoreCisco SD-WAN IPsec Tunnel Configuration
Jul 11, 2021
This blog post describes configuring a site-to-site IPsec VPN tunnel from a Cisco SD-WAN IOS-XE-based router to a non-SD-WAN device.
Read MoreCisco IP SLA IOS-XE
Feb 7, 2021
Cisco IP Service Level Agreements (SLAs) is a proprietary feature available on Cisco routers and switches, which actively generates monitoring traffic, processes replies, and measures network performance.
Read MoreConfigure and Verify Single Area OSPFv2
Jan 28, 2021
The basic configuration of OSPF requires only a couple of commands. However, to understand how the protocol works an exam candidate must learn OSPF components, some of them are complex. CCNA exam tests knowledge of OSPF operation in a single-area network.
Read MoreCompare Physical Interface and Cabling Types CCNA
Apr 18, 2020
Physical interface and cabling types is another topic from the current CCNA exam blueprint. Network engineers must know what the physical connectivity options exist, understand their limitations in speed and bandwidth. Power over Ethernet (PoE) is another related and important topic, as many critical devices are now dependent on network-delivered power.
Read MoreCisco Clock Timezone Configuration
Mar 22, 2020
This article provides sample Cisco configuration commands for popular cities using “clock timezone” and “clock summer-time” commands. It also aggregates information about different time zones and their daylight saving dates.
Read MoreCisco ACI Concepts
Oct 27, 2019
In this blog post we will explore Cisco ACI fabric components and provide high-level overview of important Cisco ACI Concepts. We will not be looking into configuration workflows, which will be a topic for another post.
Read MoreConfigure SNMP on Cisco Devices
Dec 27, 2018
This article contains information on how to enable SNMP agents on different Cisco devices, including IOS, IOS-XE, and NX-OS-based.
Read MoreCisco Routers Performance
Dec 9, 2018
In this blog post I will summarize available information on Cisco ISR and ASR performance. The following platforms will be covered: ISR G2, ISR 1100, ISR 4000, ASR 1000.
Read MoreConfigure, Verify, and Troubleshoot IPv6 Addressing
Nov 18, 2018
To configure IPv6 in IOS, as with IPv4, addresses need to be assigned to interfaces. You can assign a single link-local address and multiple global addresses. In comparison to IPv4, IPv6 unicast routing is disabled by default and needs to be globally enabled.
Read MoreIPv6 Addressing Scheme
Nov 11, 2018
IPv6 addresses are 128-bit long. An address is divided into 8 groups each containing 4 hexadecimal digits. Groups are separated from each other by colons. Each group is 16-bit long and called hextet.
Read MoreCisco VPC (Virtual Port Channel) Basics
Oct 1, 2018
VPC or Virtual Port Channel is a Cisco proprietary feature available on the Nexus platform. Two switches of the same model can be combined into a VPC pair, which can establish a single EtherChannel, also known as a link aggregate or a port channel, across both switches to a third switch or server.
Read MoreCisco TCL multiple commands at once
Sep 25, 2018
You may need to apply several commands on a Cisco device when some of the earlier commands can prevent later commands to be delivered. For example, one may need to move an external interface of a remote router to a different VRF. The moment the command that changes VRF delivered, the router removes IP address on the interface and the interactive terminal will not be able to send the remaining commands.
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