Author Archives: Robert

Cisco TCL – ping script.

In an earlier blog I wrote about a tiny hello world script.  Now I want to raise the bar a little bit, by creating a ping script. After a quick search on the internet I found a several kinds of … Continue reading

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Cisco TCL – first steps… Hello world

For some time Cisco offers TCL shell on their equipment. This is awesome, because sometimes you need a single command to retrieve information whereas IOS demands you to enter one or more commands. But before we get lots in possibilities … Continue reading

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Anki – Spaced Repetition

While studying, I am seeking for ways to study more efficient. In the beginning I stumbled upon a method called ‘spaced repetition’. This method is wildly popular in the U.S. Unfortunately when I attended high school my home country this … Continue reading

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First Hop Redundancy Protocol – HSRP

Cisco proprietary HSRP protocol is a protocol for enabling a first hop fault tolerant router. Enabling your default gateway ip address to ‘live’ on more than one router. Back in the old days you had one router to exit a … Continue reading

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Access-list mask or wildcard

G’day all, today I was messing around with access-list.  And after getting my head around the weird subnets of rfc1918. Weird as in an A-class (/8) is reserved in A-space, B-class (/16) in reserved in C-space, and for the B-space … Continue reading

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Juniper filters

In the networking world a multitude of vendors are present. And each of them have their magnificent features  but also their quirks. And one of the quirks, for the network vendors in general, is that terminology is not uniform. Where … Continue reading

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Be micro-ambitious

Target setting Continue reading

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Juniper SRX 110

This week I bought an Juniper SRX 110. This device will help me to get more acquainted with the Junos cli structure.  From a Cisco perspective this box is slightly wider than a Cisco 8xx series router. But maintaining 1U … Continue reading

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Policy Based Routing

Policy-Based routing is a neat trick to tweak traffic streams. For Policy Based Routing to work you will the following; – Define traffic stream in an access-list. – Write down a policy. – Determine the inbound interface. First use an … Continue reading

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Error-Disable

When a network port encounters an error. This port is automatically shutdown to ensure network stability. When error-disable is enabled. The predefined error are as follows; arp-inspection bpduguard channel-misconfig dhcp-rate-limit              gbic-invalid                 l2ptguard                   link-flap mac-limit link-monitor-failure loopback oam-remote-failure pagp-flap port-mode-failure psecure-violation … Continue reading

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