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Masood Ahmad Shah

This blog contains a summary of my research readings and thoughts in system and network engineering. View Masood Shah's profile on LinkedIn

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wildcard a quick way to alter the configurations in Junos
Suppose, you have multiple following circuits that need to be removed from the configurations, and then have them disabled and marked as an [AVAILABLE]: et-1/0/0 to et-1/0/10 et-1/0/13 et-1/0/21 With traditional approach the configlet would be pretty Read More...

Posted Sunday, November 09, 2014 6:53 AM by jahil | 0 Comments

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Juniper pathfinder
When buying or upgrading a Juniper device, there are always questions that come to mind ( Is “this” feature supported on “that” platform, and if so “which” version did it come out? ) As of July 1st, Juniper have released the Pathfinder tool: http://pathfinder.juniper.net Read More...

Posted Friday, July 13, 2012 2:47 AM by jahil | 0 Comments

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JNCIP-SP Certification Cleared
Earned my JNCIP-SP certification on May 20, 2011 (A completely new certification by Juniper Networks ). I hope to finish JNCIE-SP within next 3-4 week. Wish me all the luck :) Read More...

Posted Sunday, May 22, 2011 3:34 PM by jahil | 4 Comments

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disable interface TX laser (JUNOS)
Just in case if you want to simulate a fiber cut, you can enter a command from the FPC shell that cuts the power to the laser of an interface start shell pfe network fpcX test xfp <index> laser off You can find the XFP index by doing "show xfp list" Read More...

Posted Friday, December 31, 2010 11:09 AM by jahil | 0 Comments

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VLANs Cisco/Juniper
If you are familiar with Cisco switches, and using Cisco switches fairly well, this post will help you to boost your confidence as a Juniper network engineer. If you can configure a Cisco switch, then you also can configure a JUNOS based switch :) here Read More...

Posted Saturday, October 09, 2010 7:52 PM by jahil | 0 Comments

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Firewall Filter on Juniper's EX-series Switches
A firewall filters provide rules that define whether to permit or deny packets that are transiting an interface on a switch or router from a source address to a destination address. They can be applied to ports, VLANs, or layer 3 interfaces. The following Read More...

Posted Sunday, July 18, 2010 11:09 AM by jahil | 1 Comments

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MTR on Juniper JUNOS
You may have used traceroute in a Micrsoft OS or in Unix. It’s quite simple and can tell you a few things about the connection between you and any other device on the internet. So what if the problem were intermittent, or traceroute did not show any problems Read More...

Posted Saturday, November 07, 2009 11:54 PM by jahil | 0 Comments

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Viewing default/hidden config on JUNOS
Would you like to see JUNOS defaults configuration. To view certain JUNOS default settings for dynamic profiles/system/services/applications, you must type the full command: jahil@voyager# show configuration groups junos-defaults Note: TAB/SPACE autocomplete Read More...

Posted Saturday, October 24, 2009 7:42 PM by jahil | 1 Comments

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JUNOS Command Completion
The JUNOS command completion feature saves you lots of time and energy, and it provides syntax checking as you type. Gone are the days when you type a command on a line and after you press Enter the command is either invalid or not supported on that version Read More...

Posted Wednesday, August 26, 2009 11:57 AM by jahil | 0 Comments

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Juniper's JUNOS Emacs style cursor movement/Page manipulation
Remember Juniper's JUNOS is heavily influenced by Unix, afterall it does sit on top of FreeBSD. You can use EMACS commands for cursor movement, which include: Ctrl-a Moves the cursor to the beginning of the command line, back to the prompt Ctrl-e Moves Read More...

Posted Friday, July 31, 2009 2:55 PM by jahil | 0 Comments

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JUNOS Aggregated Ethernet Interfaces
Aggregated ethernet interface increases bandwidth, provides graceful degradation as failure occurs, and of course increases availability. To configure an aggregated ethernet interface on Juniper's boxes, you can use the link aggregation feature to aggregate Read More...

Posted Thursday, July 30, 2009 2:01 PM by jahil | 0 Comments

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Netflow on Juniper Router
On Juniper Router's if you want to sample all traffic, you don't really need a firewall filter, you can use the following simple form: ge-0/0/0 { unit 0 { family inet { sampling { input; } } } } Packet sampling can also be done by defining a firewall Read More...

Posted Wednesday, July 15, 2009 3:42 PM by jahil | 0 Comments

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Randy Bush on IPv6 Deployment
Great interview with Randy Bush. Very interesting thoughts about costs experienced when hitting the IPv4 wall v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} Read More...

Posted Saturday, June 13, 2009 3:31 PM by jahil | 0 Comments

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Configuring the Juniper Media, IP & MPLS MTU
Here I have some information on MTU Juniper, I had investigated it for a customer while ago. The actual frames transmitted also contain cyclic redundancy check (CRC) bits, which are not part of the media MTU. For example, the media MTU for a Gigabit Ethernet Read More...

Posted Tuesday, May 05, 2009 1:08 PM by jahil | 1 Comments

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JUNOS annotate
Adding comments to configuration is always tricky with network devices. Annotate is just one of many cool features in JUNOS. The JUNOS CLI lets you leave comments about the configuration as a part of its listing. The comments can be quite handy when you Read More...

Posted Thursday, April 02, 2009 5:16 PM by jahil | 0 Comments

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