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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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How to calculate CAR rate-limit
Here's just a quick and handy tip for anyone who is after how to calculate CAR rate-limit. normal burst = configured rate * (1 byte)/(8 bits) * 1.5 seconds extended burst = 2 * normal burst Read More...

Posted Monday, February 07, 2011 12:04 PM 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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Cisco IOS 15.0 (new features).. Awesome
Cisco released IOS 15.0. This is the next major release after 12.4. It’s been over 4 years since Cisco has delivered a major release of IOS code. The new features listed in the documentation include: •BGP Event Based VPN Import; •BGP Per Neighbor Graceful Read More...

Posted Tuesday, October 06, 2009 9:54 AM 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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Scripting for Switches/Routers
The advantage of having a scripting language on your router seems to come in pretty handy sometimes (though I bet most people don’t really use the Tcl interpreter on their Cisco’s). I have been using TCL scripts for ages. The new EEM is just heavenly, Read More...

Posted Monday, March 23, 2009 5:57 PM by jahil | 0 Comments

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Trusted Prefixes (JUNOS vs IOS)
Juniper's JUNOS: filter trusted-prefixes { term controlled-access { from { address { 192.168.1.0/24; 128.29.31.0/24; 207.46.150.0/24; 206.132.25.0/24; 208.48.26.0/24; 207.159.55.0/24; 167.216.192.0/24; } protocol tcp; port [ ftp ftp-data telnet ssh ]; Read More...

Posted Monday, February 09, 2009 5:23 AM by jahil | 0 Comments

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IGP competition ISIS or OSPF
I understand that this question is a lot more complex than a simple yes or no since factors like design and routing policy will certainly affect the protocols behavior. It's really difficult to decide and get information on what the top network service Read More...

Posted Thursday, January 22, 2009 5:28 PM by jahil | 2 Comments

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BGP default route advertisement
In most design scenarios, you’d like to advertise the BGP default route to EBGP neighbors without having a BGP default route in your own BGP table. For example, an ISP might decide to advertise only the BGP default route and local BGP networks to customers Read More...

Posted Thursday, January 15, 2009 11:09 PM by jahil | 0 Comments

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IPv6 default routing (Cisco IOS && Juniper JUNOS)
If your next hop has the information about how to get to everywhere you need to be able to reach,it is easier to use a default route than to list all the locations exhaustively :). Lets get cracking on IPv6 default routing today ! We will use the above Read More...

Posted Monday, January 05, 2009 3:14 PM by jahil | 0 Comments

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Rate limit OR traffic shaping
Rate limit or shaping is always confusing; as to which one to use. The goal of traffic shaping is hard-limiting of sending rate, while the purpose of rate-limiting is usually admission control based on burst sizes. Traffic shaping hard-forces “fixed” Read More...

Posted Thursday, January 01, 2009 4:42 PM by jahil | 0 Comments

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Multi-vendor OSPF implementation on Juniper && Cisco (Part 2)
Some differences: Because OSPF has several checks and balances in regards to neighbor adjacencies, and because those adjacencies are essential for actual routing, their defaults remain the same between the two vendors. These include authentication (except Read More...

Posted Tuesday, December 30, 2008 7:42 PM by jahil | 2 Comments

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Multi-vendor OSPF implementation on Juniper && Cisco (Part 1)
RFC stuff is really fun; I will take a look at the implementation of OSPF from the perspective of two well known vendors: Cisco and Juniper. Do you know the standards? OSPF version 2 is defined in RFC 2328 . Like all protocol standards it details every Read More...

Posted Tuesday, December 30, 2008 6:01 PM by jahil | 0 Comments

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Juniper Switches
If you have got a big block of free time, the best way to put that to use is to play with Cisco/Juniper; and thats the reason why i'm not getting married :) Anyways Juniper introduced EX switches, as promised long time before... Here are my findings.. Read More...

Posted Friday, December 26, 2008 7:06 PM by jahil | 0 Comments

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Using DNS Name in Cisco Access-lists
When you configure an access list that should prevent spammers from misusing your network, You obviously had to figure out the IP address of the ISP’s SMTP server (access lists and object groups accept IP addresses). You can enter a hostname in an IOS Read More...

Posted Wednesday, November 26, 2008 11:55 PM by jahil | 0 Comments

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How NBAR actually classifies the traffic flows?
I still love Cisco. My one true love. It hurts with you :) Anyways lets start with Layer 7 traffic filtring on Cisco router. NBAR protocol classification feature has long supported enhanced HTTP URL matching features. However, Cisco documentation site Read More...

Posted Saturday, November 15, 2008 6:22 PM by jahil | 0 Comments

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