Cisco QoS | Remark Police Detect and Shape
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Brief implementation of basic QoS techniques, this is meant to reference the last post on QoS.
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Intro to QoS // The HQF
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The purpose of this post is to provide a basic description and implementation of Quality of Service techniques, specifically in a Cisco deployment, additionally, this will serve as a QoS study guide for the CCIE R&S exam. Please refer to vendor documentation and third party literature for more in-depth concepts. QoS is typically broken out…
Read More Intro to QoS // The HQFCisco APIC-EM / Python Napalm
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Brief introduction to Cisco’s enterprise SDN solution APIC-EM and then a simple demonstration of Napalm, a python library for interacting with different network device platforms.
Read More Cisco APIC-EM / Python NapalmIP Multicast: IGMP/PIM/Auto-RP/BSR
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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/BSRPython: MySQL Query Cisco Customer DB
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In this video we go over a basic Python 2 script for querying a MySQL database, we iterate through the resulting list to get some interesting information and let the user choose which host they want to connect to, from there we can execute commands and get outputs. Make sure you set the quality to…
Read More Python: MySQL Query Cisco Customer DBTCP/UDP Operations | IPv6 PMTUD
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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 PMTUDBack to IP/ICMP PMTUD IPv6
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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 IPv6Unicast Flooding
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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 FloodingIntro to CEF: Concepts and Applications
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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 ApplicationsBasic MPLS L2VPN | VPLS | EVC | iBGP RR Autodiscovery setup
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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