:: 300-415 – I ate the Sandwich!!
Today I'm going to share my experiences for the 300-415 ENSDWI, also called the EN-Sandwich exam, which I took this week. The exam was highly overdue. To my opinion, I…
CCIE EI Notes FHRP :: GLBP IPv4
:: Protocol details Gateway Load-Balancing Protocol: Used over Layer-2 segments to provide redundant gateway functionality for IPv4 and IPv6Cisco Proprietary: Other vendors don't/cannot use this protocolFunctions: Gateway redundancy and load-sharing*…
SD-WAN :: WAN Edge sides
During my labbing adventures for SD-WAN I thought creating a SD-WAN network is simple. It actually is when you just replicate Internet and MPLS network by one box and use…
SD-WAN :: Adding vEdge Cloud
Before we jump in adding vEdges to controllers it's good to know how many roads lead to Rome. The Cisco SD-WAN solution has two types of software platforms: vEdge (Viptela…
Network Fundamentals :: Etherchannels
EtherChannels AKA LAG, Port-channels, NIC teaming, etc Main goal is to improve bandwidth and forwarding capabilities.LAG hides each member from an upper layer protocol, in this case STP. Where STP…
Network Fundamentals :: TTL
TTL (or Time To Live) is a Layer-3 loop prevention mechanism. Every time a packet passes a Layer-3 hop, the TTL decrements with 1. Packets with a TTL of 0…
Network Fundamentals :: The 802.1Q Packet
IEEE 802.1Q An additional of 32 bits are added to packet header consisting of: Tag protocol identifier (TPID): 16 bitsBelow are part of the TCI structure and is divided in…
SD-WAN :: Deploying the controllers
I've noticed that deploying SD-WAN controllers come with special treatment. Working your way through it and deploying more config than needed could result in controllers not being added to vManage…
Catalyst 6880-X :: oversubscription versus performance mode
The catalyst 6880-X has been here for a while now and has already been announced for End-of-Life in October 2019. Last day of support will be Oct 2025. Before that…
SD-WAN Deployment Options :: Partner delivered versus On-Prem
:: Partner delivered Cisco Partners can host en sell their own SD-WAN infrastructure to customers as part of value added service. By utilizing their own compute environment they can host…