My next post on #vPC in #VXLAN and #EVPN network is out. This time we take a look at configuring vPC. We also configure a Ubuntu host with two NICs to run LACP. Happy reading!

lostintransit.se/2024/05/01/cis…

People are so helpful... First they post about a problem, then they fix it and don't post the solution 😅

First post in a series of six! This post is an intro to #vPC and how it is relevant in the context of #VXLAN and #EVPN You will be introduced to the concept of Anycast VTEP.

lostintransit.se/2024/04/29/cis…

Out for dinner with the Mrs.

You have two L3 devices. You want to run a routing protocol like OSPF or BGP between them. You need multiple links for load sharing. Would you do:

1. L2 bundle with SVIs.
2. L3 bundle with routed ports.
3. Routed links with ECMP.

Motivate your answer.

I used to work with Dreamhack, world’s largest LAN party. We did have screaming telemetry. When something was done, you would know immediately before any SNMP polls or similar 😅

#CCNA 200-301 is changing from version 1.0 to version 1.1. The updates are mainly subtle and minor.

New topics are generative #AI and #ML (basic level). Chef and Puppet was removed. Makes sense!

/cc LearningatCisco

lostintransit.se/2024/04/23/ccn…

Nice opportunity if you're looking to pick up a book from Cisco Press.

One of the cool things I noticed with the Cybershield announcement was the dual dataplane. Upgrade one dataplane, forward on the other. This also means you can test your policy on one dataplane to see what the impact would be. This is powerful!

This is very interesting. Based on the eBPF tech that came with the acqusition of Isovalent.

As a technologist you have to realize that to the end user what IP address family that is used (v4 or v6) is as relevant as what frequency is used on the WiFi. It's an implementation detail.

Learn to talk to the business. What is the business requirement or advantage?

It has begun! Scheduling is now open for NetVets. See you there!

Entertaining from Ivan Pepelnjak as always.

blog.ipspace.net/2024/04/ipv6-s…

I recently learned about IPv6-Mostly networks. IPv6 only does not suffice in most cases and dual stack is wasteful, so why not compromise? It uses:

- NAT64
- DHCPv4 with option 108

IPv6 only clients don't request v4 address, saving on IPs. Could be useful in guest network.

Don't miss the great Wendell!

Important commands when running #vPC in your #VXLAN and #EVPN topology. By default, RT2 and RT5 are adv with the VIP (anycast IP) and system RMAC, which can cause issues with RT5. This command does:

- Advertise RT2 with VIP, Virtual RMAC
- Advertise RT5 with PIP, system RMAC

Are you all still interested in learning the networking fundamentals? STP, OSPF, BGP, etc? I'm contemplating if there's still interest in doing so and if should spend my time blogging about these. Or are there already enough resources?

I wanted to show something with autoneg in CML, but seems the Linux nodes don't support autoneg?

My best gues is this is because it's a VM and autoneg is in the PHY?

Tried with both Ubuntu and Alpine.

Upgraded to CML 2.7!

If I asked you how a 1000BASE-T PHY decides to bring a link down, what would you respond? If you followed along in my #Ethernet series, in this post I describe the factors the PHY take into consideration. Energy detect, MSE, FCS, are some of the factors.

lostintransit.se/2024/04/10/100…