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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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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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MPLS-in-GRE & MPLS-in-IP
JUNOS now support MPLS-in-GRE & MPLS-in-IP. You guys can now encapsulate the MPLS label stack for a packet with an IP header, making it possible to tunnel MPLS over networks that do not have MPLS enabled on their core routers. The JUNOS software supports Read More...

Posted Saturday, March 7, 2009 2:22 PM by jahil | 2 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 9, 2009 5:23 AM by jahil | 0 Comments

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JUNOS VPLS on FE Interfaces
TThere are numerous misconception about VPLS support on Juniper Fast Ethernet PICs. Here is a little quick workaround running VPLS on Juniper's "PE-4FE-TX and PB-4FE-TX" PICs. This setup requires MPLS LSPs between PEs... Interface Configuration: jahil@jahil-re0 Read More...

Posted Wednesday, February 4, 2009 1:20 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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JUNOS BGP 'apply-path'
JUNOS provide very flexible filtering options and support a rich variety of sources besides the usual AS Path, neighbor IP, Port and Prefix-list. Today we will talk about BGP. What do you know about BGP securing BGP session? Instead you can simple block Read More...

Posted Sunday, January 18, 2009 7:05 PM by jahil | 0 Comments

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Juniper JUNOS Funny Poetry
JUNOS guys promise they would not make it boring! If you don't want to configure something on JUNOS, spend some time with JUNOS haiku. A hidden command is a command that does not show up when you use ? in the CLI and does not autocomplete with tab or Read More...

Posted Wednesday, January 7, 2009 10:42 PM by jahil | 1 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 5, 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 1, 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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L2VPN Taxonomy
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Posted Wednesday, September 17, 2008 9:22 PM by jahil | 0 Comments

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JUNOS Candidate Configuration and Explicit Commits
One of my longtime gripes about IOS is that when you type a new statement to the CLI and hit return, the statement immediately becomes active on the router. For someone as mistake-prone as me, this is a big risk. And given that the majority of network Read More...

Posted Sunday, September 14, 2008 5:58 PM by jahil | 0 Comments

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Scripting and Customization in JUNOS
JUNOS software (Juniper's) is a highly useful nework operating system for any network engineer to achieve goals. In JUNOS, there are times when you can enter all the individual lines of a configuration correctly, and the configuration can still be wrong. Read More...

Posted Monday, September 8, 2008 1:47 PM by jahil | 0 Comments

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