Configuring DMVPN (Dynamic Multipoint Virtual Private Network) with BGP (Border Gateway Protocol) involves setting up a scalable and secure VPN solution for connecting multiple sites. Here’s a basic guide on how to configure DMVPN with BGP:
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Archives
bookmark_borderIPSEC/GRE VPN Tunnel and OSPF Configuration
Configuring an IPsec GRE (Generic Routing Encapsulation) VPN tunnel with OSPF (Open Shortest Path First) involves several steps. In this example, we’ll configure a basic IPsec GRE VPN tunnel between two routers and enable OSPF routing over the tunnel. For this example, we’ll assume Router A and Router B are the two endpoints of the VPN tunnel.
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bookmark_borderCisco Catalyst 9500 StackWise Virtual Configuration
StackWise Virtual (StackWise-V) is a stacking technology used in Cisco Catalyst 9500 Series switches that allows you to virtualize multiple physical switches into a single logical switch. This provides simplified management and enhanced resiliency. Here is a basic guide on how to configure StackWise Virtual on Cisco Catalyst 9500 switches:
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bookmark_borderHow to Configure route redistribution in OSPF
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:
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bookmark_borderHow to configure OSPF with BGP on top
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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bookmark_borderHow to configure BGP AS Prepending
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:
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bookmark_borderCisco Catalyst 9800-CL Wireless Controller HA SSO Configuration Guide
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.
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bookmark_borderCisco Catalyst C9500-24Y4C Code Upgrade Amsterdam
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.
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bookmark_borderCisco 2504 Wireless Lan Controller Software Upgrade
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.
bookmark_borderCisco 5520 Wireless Controller Code Upgrade HA
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.
