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22 juillet 2013 1 22 /07 /juillet /2013 16:05

Junos and BGP FlowSpec
Introduction Recently I carried out tests in labs to evaluate the FlowSpec implementation on MX960 router with TRIO MPC cards. I used a 12.3 Junos release. Those tests have covered: - IPv4 blackholing traffic feature - IPv4 rate-limiting traffic feature...
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23 avril 2013 2 23 /04 /avril /2013 09:45

Playing with event-scripts
Last week, I worked on 2 small projects in 11.4 Junos. I should: - Find a way to automatically disable a physical link when LACP "flapped" too many times during a given time. - Find a way to automatically disable a physical link when too many CRC errors...
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11 février 2013 1 11 /02 /février /2013 15:34

TRIO Card: packet capture with pfe commands
During a complex case on Juniper platform, I looked for a tip to capture transit traffic on a MX960 with Trio cards. Indeed, I suspected a Junos box to rewrite transit mpls traffic with an unexpected exp value. As I love carry out reverse engineering,...
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26 janvier 2013 6 26 /01 /janvier /2013 16:46

A new short post today for network support technicians, engineers... One thing that you usualy check when you manage a case regarding service disruption is packet loss! The first step is to check if you have packet loss at physical layer due to framing...
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3 décembre 2012 1 03 /12 /décembre /2012 18:28

Multicast on TRIO
This post describes how multicast Next-Hop resolution and caching is done on Junos MX routers with Trio based cards. To have more information regarding the multicast replication see my previous post here : Multicast Replication. 1/ Introduction: PIM join...
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24 août 2012 5 24 /08 /août /2012 16:28

Junos Load Balancing - PART 3 - Troubleshooting
Troubleshooting Load-balancing is quite complex. Working on an operational team, I often need to know on which interface a given stream (IP or MPLS) will get out... Cisco IOX provides several cli commands to quickly compute and display the result of a...
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20 août 2012 1 20 /08 /août /2012 10:52

Junos Load Balancing - PART 2 - Configuration
The configuration of the load balancing parameters is done at the forwarding-option level. There are 2 parts, each one is related to a type of hardware: - hash-key : for Ichip based platforms on MX or T series FPC - enhanced-hash-key : for Trio based...
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19 juin 2012 2 19 /06 /juin /2012 10:19

Just for fun: I love Junos in OP Script
A simple op script, just for fun. Next blog post will be more serious :) FOR TERMINAL : 24 Rows / 80 Columns / font: Courrier New 10 The video can see here : The 'op' script is called lovejunos.slax. It has been tested with release 11.4. You can simply...
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24 mai 2012 4 24 /05 /mai /2012 17:48

Junos Load Balancing - PART 1 - Introduction
I try to explain load balancing on MX. This post does not cover all the cases, but tries to summarize the default behaviour depending on the type of card: ICHIP or TRIO based, to provide which fields can be add or remove to compute the hash and finally...
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17 avril 2012 2 17 /04 /avril /2012 17:06

My previous post has presented an hidden command for analysing in real time fabric statistics. I've developed a small op script, for the MX platform, that provides in one command the PFE/Fabric IN/OUT statistics for all the Fabric Planes (0 to 5) for...
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