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Wrapped the Latest BGP Module at CBT Nuggets Today!

September 21, 2018 at 7:39 pm

BGP

That’s right- finished up the last Nugget today for the course below. I will post again here at the blog when the course appears on the CBT Nuggets website next week!

Border Gateway Protocol (BGP) – Scalability Mechanisms

  1. Module Introduction
  2. Private AS Numbers
  3. Peer Groups
  4. Session Templates
  5. Policy Templates
  6. IBGP Scalability Issues
  7. Route Reflectors
  8. Advanced Route Reflector Designs
  9. Confederations
  10. Configuring a Confederation
  11. Introduction to BGP Communities
  12. Community Attribute Formats
  13. Well-Known Communities
  14. Extended Communities
  15. Configuring BGP Communities

Remember, this is one more BGP module to complement the existing modules currently on CBT Nuggets:

  • BGP – Basic Operations
  • BGP – Peerings
  • BGP – Advertising NLRI
  • BGP – Cisco Routing Policy Mechanism

Live WebEx Meetup – Critical Lab Exam Strategies Part 1

September 21, 2018 at 7:12 pm
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A Sample AWS Implementation

September 20, 2018 at 7:34 pm

In this sample Nugget from the AWS Certified Cloud Practitioner course at CBT Nuggets – we examine an AWS solution and how it uses the various services.

Certified Cloud Practitioner

1.1.d [ii] IPv4 options, IPv6 extension headers – Part 1 of 2

September 20, 2018 at 11:24 am
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CCIE DC Written – 1.1.a Link Aggregation – LACP

September 20, 2018 at 2:05 am

NX-OS

Here are some Nexus facts to keep in mind:

  • With LACP, you can bundle up to 16 interfaces in a channel group. If the channel group has more than 8 interfaces, the remaining interfaces are in hot standby for the port channel associated with this channel group on the M-series modules.
  • From Cisco NX-OS Release 5.1, you can bundle up to 16 active links into a port channel on the F-series module.
  • When you delete the port channel, the software automatically deletes the associated channel group. All member interfaces revert to their original configuration.
  • You cannot disable LACP while any LACP configurations are present.
  • When you run static port channels with no aggregation protocol, the channel mode is always set to on.

Of course, you must globally enable LACP before you can use it on the Nexus device. There are two modes:

  • Passive – responds to negotiations, but does not initiate them – sounds like me at the High School dance
  • Active – initiates negotiations

Starting at 4.2(3) – Cisco introduced some LACP compatibility enhancements as follows:

  •  When a Cisco Nexus device is connected to a non-Nexus peer, its graceful failover defaults may delay the time taken for a disabled port to be brought down or cause traffic from the peer to be lost. To address these conditions, the lacp graceful-convergence command was added.
  • By default, LACP sets a port to the suspended state if it does not receive an LACP PDU from the peer. In some cases, although this feature helps in preventing loops created due to misconfigurations, it can cause servers to fail to boot up because they require LACP to logically bring up the port. You can put a port into an individual state by using the lacp suspend-individual command.

Starting with Release 5.1 Cisco introduced the Minimum Links feature as well as MaxBundle. The Minimum Links feature allows you to:

  • Configure the min number of links that must be in the bundle
  • Prevent low bandwidth LACP bundles from becoming available
  • Causes the port channel to go inactive if the required min bandwidth is not available

MaxBundle allows:

  • Upper limit on ports that are bundled
  • Allows the designation of ports as hot standby

Basic Configuration

  • Use feature lacp to enable the feature
  • Create the port channel interface with interface port-channel 10, use the switchport command in the interface
  • Add a Layer 2 interface to the port channel with switchport followed by channel-group 10 mode passive