NetworkGods – Routing, Switching, Wireless, Automation
Route redistribution in OSPF (Open Shortest Path First) allows routes learned from one routing protocol to be advertised and used in another routing protocol. Redistribution can be useful in scenarios where multiple routing protocols are used within an enterprise network. Here’s a basic guide on how to configure route redistribution in OSPF:
Continue reading “How to Configure OSPF Route Redistribution”
Configuring OSPF (Open Shortest Path First) with BGP (Border Gateway Protocol) on top is a common practice in large-scale networks where OSPF is used for intra-domain routing and BGP is used for inter-domain routing. This approach is often referred to as “OSPF as the IGP (Interior Gateway Protocol) and BGP as the EGP (Exterior Gateway Protocol).” Here’s a basic guide on how you can configure OSPF and BGP coexistence:
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BGP AS (Autonomous System) prepending is a technique used to influence the inbound traffic by making a particular Autonomous System path less attractive. This is achieved by adding the AS number multiple times to the AS path attribute of BGP updates sent to a neighbor. The idea is to make the AS path longer, and therefore less preferred, in order to influence incoming traffic.
Here’s a general guide on how to configure BGP AS prepending:
Continue reading “How to configure BGP AS Prepending”
A while back I was assigned to work on a project which requires, among other things, to deploy wireless in 4 offices.
I decided to interconnect the office in a hub and spoke fashion. For wireless I decided to use Cisco 9130AXI Wireless Access Points and a Cisco Catalyst 9800-CL Wireless Controller.
Continue reading “Cisco Catalyst 9800-CL Wireless Controller HA SSO Configuration Guide”
When you need a more beefy core switch for your organisation that supports 25, 40 and 100 Gbps interfaces the Cisco Catalyst 9500 switch might be the right choice.
Continue reading “Cisco Catalyst C9500-24Y4C Code Upgrade Amsterdam”
The code upgrade procedure for the Cisco 2504 Wireless Lan Controller is not that different than the one for the Cisco 5520 described in details here. This time I will keep it short, simple and to the point.
Worth mentioning that the Cisco 2504 it is now EOL and will be supported by Cisco a few more years.
You should check the release notes and confirm your wireless access points are supported by this version of code.
You may also look at the compatibility matrix for Cisco Prime if you are using that. Some of the features might stop working and you’ll have no idea why.
If you’re looking for tips of how to implement a code upgrade on a Cisco 5520 Wireless Controller you are probably working in a medium-large organization as I don’t expect to see a normal guy installing a toy like that in their attic. But you’ll never know.
In my setup I have two Cisco 5520 Wireless Controllers configured for SSO High Availability and they are serving a mix of over…many Cisco Wireless Access Points: Cisco 3502, Cisco 3702 and the mGIG beauties Cisco 3802.
I am upgrading from 8.3.143 to 8.5.135. Please download the code only from Cisco’s official website.
Continue reading “Cisco 5520 Wireless Controller Code Upgrade HA”
A few days ago I wrote another post showing a way of how to implement a code upgrade for a Cisco Catalyst 3850 Switch from 3.x.x to 16.x.x.
Since the commands to be used are slightly different when upgrading from 16.x.x to 16.x.x (Denali to Denali and so on), I decided to write this down. I know I had some problems when I moved from 3.6.6 to 16.
The below commands can be used for the newer models of switches the Catalyst 9k Series as well.
As you all now, on 24th of September 2019 the long awaited CentOS 8 has been released.
It can be downloaded via the official CentOS page.
If you’re just looking for a CentOS 8 x86_64 image, download it from here.
If you’re reading this you probably know already what an NTP server is. However, long story short NTP stands for Network Time Protocol, used for clock synchronization most of the times in client-server scenarios. It uses UDP port 123. Easy. For a CentOS 7 NTP Server, read below.
