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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 

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 you go..   IOS#vlan-database(vlan)#vlan 5 name Internet(vlan)#vlan 6 ...

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 Restart Configuration;•BGP RT Changes Without PE-CE Neighbor Impact;•BGP local ...

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);} Normal 0 false false false EN-US X-NONE ...

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, you can trigger on almost everything. Even add your own syslog messages or create menus for ...

Juniper's JUNOS: filter trusted-prefixes {   term controlled-access {     from {        address {                     ...

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 providers are using for their IGP? I'm trying to build a case for switching from OSPF to IS-IS ...

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 multi-homed to a single ISP. To advertise a BGP default route to a BGP neighbor, use the ...

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 simple network toplogy to configure default routing on Cisco/Juniper ...

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” sending rate, absorbing and smoothing incoming packet bursts. Rate-limit never smoothes but ...

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 in the case of OSPFv3), hello/dead intervals and area types. One note about authentication: ...

 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 aspect of the protocol. And like all protocol standards it leaves just enough room for ...

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..EX Switches have Frontal LCD panel for maintenance procedures, isn't it crazy that you can reset ...

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 ACL … and it works. Actually, IOS performs a DNS lookup when you enter the hostname (assuming you ...

 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 never provided a detailed description of the pattern language used for URL matching; ...

   

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 problems are due to human error rather than hardware and software failures, it is a risk for ...

In Cisco IOS, Every mode (user mode, privileged mode etc) has help system built in. You can use the magic question mark (?) in user mode as well as in sub-configuration mode. What if you want to use question mark (?) in description or aspath-regex. :) Well, to write a question mark in IOS, the escape sequence CTRL-V or ESC-Q must be entered ...

NBAR can be used to apply application based filters such as blocking youtube.com traffic. To accomplish this we can categorize traffic based on the HTTP hostname. Next we will create a policy-map that matches the youtube.com class and drops the traffic. Lastly the policy is applied outbound to the Internet. Syntax-wise this would ...

The post has been written to answer Mr Drew's asked question.  The NetFlow table on the route processor (RP) captures statistics for flows routed in software and the NetFlow table on the PFC (and on each DFC) captures statistics for flows routed in hardware. In PFC3A mode, NetFlow collects statistics only for routed traffic. With ...

I just finished Vol 1 Bridging and Switching labs... again. I'm redoing all of Vol 1 labs, and repeating once more the ones I wasn't able to do without consulting the Doc cd or the lab solutions. My idea is to have an absolute mastership in all technologies focused on Vol 1's labs, before moving on to Vol 2.Volume 1 labs are great to ''solidify'' ...

There are 5 max concurrent session in Cisco world. There can be a situation in life in which the max concurrent sessions reach the limits. When addressing such situations, it might help. The following command on Unix will dump all the TCBs of the remote router:   jahil$ snmpwalk -v 2c -c your_readwrite_community router ...

Generally there are no adverse side effects from enabling CEF. The main one to watch out for is that certain debugging will not work for packets that are fast switched. I have spent many unhappy hours struggling unsuccessfully to get the information that I wanted before I realized what the problem was. As it turns out, the router will ...

v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} salam Farhan Zaheer 2 200 2006-11-27T05:40:00Z 2007-08-25T07:53:00Z 2007-08-25T07:53:00Z 1 852 4860 xper2go 40 11 5701 ...