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Tuesday, October 06, 2009 9:54 AM

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
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Saturday, June 13, 2009 3:31 PM

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);}
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Monday, March 23, 2009 5:57 PM

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,
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Monday, February 09, 2009 5:23 AM

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 ];
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Thursday, January 22, 2009 5:28 PM

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
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Thursday, January 15, 2009 11:09 PM

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
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Monday, January 05, 2009 3:14 PM

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
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Thursday, January 01, 2009 4:42 PM

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”
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Tuesday, December 30, 2008 7:42 PM

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
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Tuesday, December 30, 2008 6:01 PM

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
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Friday, December 26, 2008 7:06 PM

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..
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Wednesday, November 26, 2008 11:55 PM

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
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Saturday, November 15, 2008 6:22 PM

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
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Wednesday, September 17, 2008 9:22 PM

L2VPN Taxonomy

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Sunday, September 14, 2008 5:58 PM

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
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