Cisco and Verizon demonstrate multi-haul

As Internet traffic grows and becomes more dynamic, optical transport networks for sub-sea, terrestrial long haul and metro need more capacity. The ability to deploy capacity quickly is equally important to handle the increasingly dynamic nature of the traffic. The concept of a multi-haul transport platform, as introduced by Andrew Schmitt of Cignal AI, becomes very appealing for achieving this ability to scale with speed while maintaining operational simplicity – a single platform for all requirements. A critical element of the multi-haul optical platform is the flexibility of the coherent optics to be tuned to fine granularity in order to meet the reach-capacity target of any given network.

https://ciscocentral.blogspot.com/2019/02/cisco-and-verizon-to-demonstrate.html

Cisco 2960X I/O usage

While double checking some stats on a network I came across this in Libre.   84% is usually something that would cause me to be alarmed, as Libre is trying to tell us.

After some research, I found the following.

While it is not documented, it was noted that this was by design and that it would not affect the switch as the switchport becomes more and more loaded.

The switch allocates dedicated memory to certain processes / resources by default and then additional resources when the configuration is added. This ensures proper functionality and is again by design.

The I/O Memory pool buffers information transmitted to and from the CPU, and does not affect the actual forwarding of packets on the switch.

Translation: The switch uses up these resources by default, even if they aren’t all being used.  Think of it as setting it aside for future use without dynamic allocation of them.

Some Basic Cisco router terminology

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Not enough file system space on Cisco nexus?

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Cisco ORF (Outbound route filtering)

Outbound Route Filtering (ORF) is a Cisco proprietary feature that prevents the unnecessary exchanging of routes that are subject to inbound filtering. This, in turn, minimizes bandwidth across the links and reduces CPU cycles upon the router during the processing of the neighbor UPDATE.

ORF works by the router transmitting its inbound filters to its neighbor, which the neighboring router then applies outbound.

great article on how to do this if you are running Cisco routers and your provider is too.

https://community.cisco.com/t5/networking-documents/bgp-orf-outbound-route-filtering-capability/ta-p/3153286

What you need to know for the new CCNA 201-301

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IOS Self-Signed Certificate Expiration on Jan. 1, 2020

At 00:00 on 1 Jan 2020 UTC, all Self-Signed Certificates (SSC) that were generated on IOS/IOS-XE systems will expire, unless the system was running a fixed version of IOS/IOS-XE when the SSC was generated.  After that time, unfixed IOS systems will be unable to generate new SSCs.  Any service that relies on these self-signed certificates to establish or terminate a secure connection might not work after the certificate expires.

https://www.cisco.com/c/en/us/support/docs/security-vpn/public-key-infrastructure-pki/215118-ios-self-signed-certificate-expiration-o.html

Articles in the works

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