Using Tools Like Wireshark to Reinforce Your Studies

January 20, 2018 at 6:00 am

Wireshark

This video reminds students to use tools like Wireshark during their studies to reinforce the topics they are learning!

CCIE R&S Personal Training – Preregistration Open!

January 2, 2018 at 9:59 pm

CCIE RS

Are you one of the readers that are planning to sign up for CCIE R&S Personal Training here at AJSnetworking.com? Preregistration for this service is now available. This provides our trainer(s) with an opportunity to get to know you and your current status with CCIE R&S studies. Please only complete the form using the link below if you actually plan on signing up for the service. Below is a recap of the offerings in this program.

  • Daily, never before seen content (quizzespostschecklistsvideoslab task challenges)
  • The latest news (and even rumors) surrounding the CCIE R&S exams and material
  • Private Slack workgroup for chat
  • Valuable, downloadable resources including study tools and software
  • Live, recorded meeting sessions
  • Checkpoint assessments to validate readiness in exam areas
  • Members-only forum access
  • Private email access to our coaches
  • Special offers from AJSnetworking.com partners
  • Much more!

The introductory (lock-in) price for new members is $9.95 per month via PayPal Subscriptions. A $99.50 discounted option is available for yearly signups. Your subscription will auto-renew each interval through PayPal, but of course, you can cancel at any time.

Here is the link for pre-registration:

CLICK HERE TO PREREGISTER! 

Rapid Spanning Tree Protocol (RSTP) 802.1w

December 29, 2017 at 8:10 am

rstp

Whether you are pursuing your CCNA, CCNP, CCIE, or many other Cisco Certifications, a deep knowledge of RSTP is critical. In this post, we will detail key facts for you regarding this Layer 2 loop prevention system.

  • 802.1w (RSTP) is an evolution of the classic 802.1D (STP) protocol
  • 802.1D tried to speed things up with the additions of UplinkFast, BackboneFast, and PortFast; the UplinkFast and BackboneFast features are now essentially built into RSTP, while PortFast is still a feature you enable in RSTP if desired
  • 802.1w can also revert back to 802.1D in order to interoperate with legacy bridges on a per-port basis
  • With 802.1D, once in the forwarding state, there is no way to tell from the port state whether the port is root or designated; RSTP decouples the role and the state of a port to address this issue
  • The 802.1D port states are Disabled, Blocking, Listening, Learning, Forwarding; in 802.1w these are simplified to Discarding, Learning, Forwarding
  • The port roles are expanded in 802.1w to include Backup and Alternate ports in addition to Root and Designated; these new port roles help implement the features of UplinkFast into the protocol natively
  • A Backup port receives more useful BPDUs from the same bridge it is on and is a port blocked
  • An Alternate port receives more useful BPDUs from another bridge and is a port blocked
  • RSTP now uses all six bits of the flag byte that remain in order to perform – encoding the role and state of the port that originates the BPDU and handling the proposal/agreement mechanism
  • The RSTP BPDU is now of type 2, version 2; legacy bridges must drop this new BPDU; this makes it easy for an 802.1w bridge to detect legacy bridges connected to it
  • BPDUs are sent every hello-time, and not simply relayed anymore’
  • BPDUs are now used as a keep-alive mechanism between bridges; a bridge considers that it loses connectivity to its direct neighbor root or designated bridge if it misses three BPDUs in a row; this fast aging of the information allows quick failure detection
  • To natively support the BackboneFast type behavior, RSTP accepts inferior BPDUs; when a bridge receives inferior information from its designated or root bridge, it immediately accepts it and replaces the one previously stored; this permits fast acceptance of a new Root port in the topology
  • Rapid transition is the most important feature introduced by 802.1w; RSTP is able to actively confirm that a port can safely transition to the forwarding state without having to rely on any timer configuration; in order to achieve fast convergence on a port, the protocol relies upon two new variables: edge ports and link type
  • RSTP can only achieve a rapid transition to the forwarding state on edge ports and on point-to-point links; the link type is automatically derived from the duplex mode of a port
  • A proposal/agreement process in RSTP aids in very convergence
  • The topology change notification process is overhauled in order to also aid in faster convergence and improve efficiency

For more details on these new features summarized here – check out Understanding Rapid Spanning Tree Protocol (802.1w) This document often forms the basis for plenty of RSTP-related written exam questions from CCENT to CCIE. Note that my summary document here covers most of those questions for you, however!

criers

 

VIRL Gets a Refresh! (Finally)

August 17, 2017 at 4:55 pm

VIRL

Cisco’s own answer to GNS3 is finally getting an update with lots of improvements. Granted they had us spoiled before at the breakneck pace they were releasing updates.

VIRL PE 1.3 will be released on Wednesday, August 23, 2017. Important changes in this release include:

  • Updated virtual machines:
    • IOSvL2, including many bug fixes, including fixes for ARP L2 MAC address learning and port channel issues
    • CSR1000v 16.5.1, including an increase in the bandwidth cap from 100kbps to 1mbps
    • IOS XRv 6.1.3
    • ASAv 9.7.1
    • NX-OSv 9000 7.0.3.I6.1, not bundled, but available for download and supported out-of-the-box
  • Infrastructure refreshed to Ubuntu 16.04, KVM/QEMU 2.5, and OpenStack Mitaka to ensure the ability of VIRL PE to run the latest router VMs.
  • Updated installation instructions and simpler single-interface installation options.
  • Bug fixes for the core VIRL PE components.

Important Notes:

  • Single user restriction will be enforced starting with VIRL PE 1.3. That is, with version 1.3 and newer, only a single project ‘guest’ with a single user ‘guest’ can be created and used at the same time.
  • VIRL PE 1.3 will require a fresh installation, either by deploying the OVA or — for bare metal systems — by installing the ISO image. If you are running VIRL 1.2.83 or earlier today, you cannot perform an in-place upgrade.
Pearson Education (Peachpit)

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Cisco CCNA – Practice OSPF in GNS3

July 26, 2017 at 12:45 pm

In this video, we use GNS3 to quickly and efficiently practice the configuration, verification, and troubleshooting of OSPF.

InformIT (Pearson Education)

Keeping Cisco VIRL Up To Date

July 22, 2017 at 11:56 am

In this video, Anthony Sequeira walks you through the best practices approaches to keeping your Cisco VIRL as up to date as possible so that you can take advantage of all the latest features and ensure your system runs as smoothly as possible.

InformIT (Pearson Education)

Cisco Data Center – ACI

July 17, 2017 at 1:11 pm

In this Nugget from CCNA Data Center at CBT Nuggets, students learn the basics of Cisco ACI so they can thrive later on in their studies!
Microsoft

Cisco Data Center – Troubleshooting OTV

July 16, 2017 at 6:04 pm

Are you ready to enjoy a glimpse into the world of Overlay Transport Virtualization (OTV) troubleshooting. Enjoy this slice of one of our highly rated Cisco Data Center courses at CBTNuggets!

Microsoft