Technical references: https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/guide-c07-734107.html About VXLAN: VXLAN is a network virtualization technology that allows for the extension of Layer 2 networks over a Layer 3 physical infrastructure. It helps overcome the limitations of traditional VLANs, especially in large data centers. VXLAN allows much better scalability as compared to traditional VLANs with the ability to provision many … Continue reading BGP EVPN with VXLAN
Category: Network Design
NSX-T VRF Gateway use-case and Traffic Flows
Similar to routers with VRF lite feature, NSX Tier 0 Gateway supports VRF gateway feature which allows multiple VRF gateways to exist under the parent Tier 0 Gateway. Based on the VMware configmax portal, NSX version 4.1.2 supports up to 100 VRF gateways per edge node. VRF gateways in NSX save CPU, memory and storage … Continue reading NSX-T VRF Gateway use-case and Traffic Flows
Route Summarization from Distribution to Core
Route Summarization from Distribution to the Core This post is about a particular problem being faced once route summarization is introduced and how it can be avoided. This concept is covered very well in these books from Cisco Press: http://www.ciscopress.com/store/ccde-study-guide-9781587143809 http://www.ciscopress.com/store/optimal-routing-design-9781587051876 In this topology diagram 1 above, C1 and C2 are the core routers. … Continue reading Route Summarization from Distribution to Core
Always avoid Single Point of Failures SPOFs
I was told recently that organization XYZ suffered outage because one of their core devices did not have redundancy. In other words, there was a single point of failure somewhere in their network. And then their technical team kept fire fighting until the issue was resolved. This post is about avoiding this nuisance called SPOF … Continue reading Always avoid Single Point of Failures SPOFs
OSPF Area Border Connection Behavior
OSPF Area Border Connection Behavior Reference: Designing Cisco Network Service Architectures ARCH Foundation Learning Guide - Cisco Press In the case of OSPF, area definition is on a per layer 3 interface basis. For example, referencing the topology above, the link between router D and router F is placed in area 1 Traffic crossing the … Continue reading OSPF Area Border Connection Behavior
Networking & Security 