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Nick Carlton
Nick Carlton
Nick's Technical Knowledge Base

Cisco

Cisco

Cisco DMVPN Phase I

In this guide, we will setup DMVPN Phase 1. In that we have one central hub, with multiple spokes. Spokes will learn about both Hub and other Spoke prefixes via EIGRP. Spoke to Spoke traffic is permitted, however the Hub is used in the Data Path. Lets have a look Read more…

By Nick Carlton, 3 years27th October 2022 ago
Cisco

MPLS L3VPN Configuration – Giving Customers Internet Access

By Nick Carlton, 3 years1st May 2022 ago
Beginner Tutorial

Cisco Policy Based Routing on L3 Switch

In this guide, I will show how to implement basic Policy Based Routing on a Layer 3 Switch. Here is the topology we will work on: In this scenario, we have two routers connected to a core switch. We then have some clients in Vlan 30 attached to the switch. Read more…

By Nick Carlton, 3 years30th March 2022 ago
Cisco

BGP Conditional Route Advertisement for ISP Failover

When using BGP and peering with multiple ISPs at the edge, you can use a feature within BGP that allows you to advertise networks to a neighbour dependent on the existence of a route in the BGP RIB. This is called conditional route advertisement. In this guide, we will be Read more…

By Nick Carlton, 3 years6th February 2022 ago
Cisco

Using community values and route maps to create a partial BGP table

When you peer with a Service Provider using BGP. They will likely ask you if you want the full BGP table, a partial table or just a default route. Most devices you have on your companies edge, will not be able to handle the full BGP table. As even just Read more…

By Nick Carlton, 4 years13th January 2022 ago
Cisco

Using prefix lists and route maps to create a partial BGP table

When you peer with a Service Provider using BGP. They will likely ask you if you want the full BGP table, a partial table or just a default route. Most devices you have on your companies edge, will not be able to handle the full BGP table. As even just Read more…

By Nick Carlton, 4 years9th January 2022 ago
Cisco

Leaking Routes from Global to VRF – BGP

VRFs are an excellent tool for Layer 3 separation on a router. Allowing you to separate routing domains and control where traffic can be routed, much like VLANs on a Switch. VRFs are also required for MPLS L3VPN deployments. There may be a requirement for you to leak routes from Read more…

By Nick Carlton, 4 years3rd January 2022 ago
Cisco

Leaking Routes from Global to VRF – Static Routes

VRFs are an excellent tool for Layer 3 separation on a router. Allowing you to separate routing domains and control where traffic can be routed, much like VLANs on a Switch. VRFs are also required for MPLS L3VPN deployments. There may be a requirement for you to leak routes from Read more…

By Nick Carlton, 4 years3rd January 2022 ago
Cisco

MPLS LSP Walkthrough – With IGP Caveat

I am going to walk through how the LSP (Label Switched Path) is found on Cisco devices running LDP and go through a practical demonstration. First, lets look at our topology: In this demonstration we are looking at the path for traffic originating from CE_CUSTA_2 to CE_CUSTA_1. Let’s look at Read more…

By Nick Carlton, 4 years1st January 2022 ago
Cisco

Cisco MPLS L3VPN Configuration – BGP as the PE-CE Routing Protocol

By Nick Carlton, 4 years25th December 2021 ago

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Recent Posts
  • Cisco Nexus vPC – Part 3 – Peer Priority
  • vPC VXLAN EVPN Leaf and Spine – Part 11 – Infra-Vlans
  • vPC VXLAN EVPN Leaf and Spine – Part 10 – Solving External Access issue
  • vPC VXLAN EVPN Leaf and Spine – Part 9 – External Access outside Fabric
  • vPC VXLAN EVPN Leaf and Spine – Part 8 – L3VNI Configuration – Multi Tenant Leaking

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