From now on, we will skip over some of the sections of the blueprint in order to cover the fundamentals of the technologies or applications introduced in the CCIE first, meaning we will try to go over the stuff that is not covered previously in the CCNP exams. This time, we will talk about Multicast,…
Read More IP Multicast: IGMP/PIM/Auto-RP/BSR
Moving on through the OSI model we face the Layer 4, here we will probably find the TCP or UDP header, let’s very briefly go over the basic structure and use cases for the two, then we will set up an example topology and try to dissect a TCP session establishment, and then maybe observe a UDP header. After that…
Read More TCP/UDP Operations | IPv6 PMTUD
In this post we will touch different topics, although they are all going to be related to Internet Protocol concepts. What is ICMP anyways ? what are the different IPv4 options ? what is fragmentation ? how does the IP MTU and TTL relate to ICMP messages ? these are all questions that we will…
Read More Back to IP/ICMP PMTUD IPv6
Continuing with our CCIE R&S blueprint, in this post I’ll try to explain what unicast flooding is, the difference between this flooding happening as a normal behavior and as something persistent and undesirable within our network due to issues such as asymmetric routing and CAM table overflow. Unicast flooding means that the switch will send…
Read More Unicast Flooding
In this post we will briefly talk about Cisco Express Forwarding, the modes, the differents parts that make up the CEF table, polarization effect and load balancing hash. Packet switching is the act of taking incoming packets on an ingress interface and placing them on an egress interface to be sent out to a destination, let us…
Read More Intro to CEF: Concepts and Applications
This is a basic implementation of L2 services across an mpls enabled core, we turn up a p2p customer and a full mesh customer. Leverage bgp autodiscovery and service instances for the AC. Useful links: https://supportforums.cisco.com/docum… http://www.cisco.com/c/en/us/td/docs/… https://supportforums.cisco.com/docum… http://www.cisco.com/networkers/nw04/… http://www.cisco.com/c/en/us/td/docs/… http://www.cisco.com/c/en/us/td/docs/… http://www.cisco.com/c/en/us/td/docs/… https://tools.ietf.org/html/rfc4448
Read More Basic MPLS L2VPN | VPLS | EVC | iBGP RR Autodiscovery setup
Basic GNS3 exercise in which we leverage two CIPCs on different CMEs to test dial-peers and class of restriction lists. We also talk a little about digit manipulation and auto qos for voice deployments. Hope you enjoy !
Read More Cisco CME DIal-Peers | COR Lists | Digit Manipulation
Brief description of SIP/SCCP, RTP protocols and the way they work, introduction to dial-peers and HWIC Interfaces, basic PLAR setup.
Read More Cisco SIP SCCP RTP FXO FXS Dial-Peers PLAR
Introductory Cisco Voice and VoIP concepts and walkthrough on SCCP and SIP phones registration to CME
Read More Intro to Cisco Voice CME | SCCP and SIP Registration
Basic multiple redistribution point scenario and VRF introduction.
Read More Intro to Redistribution and VRF Lite