Month: June 2014

What is Software Defined Networking or SDN?

What is software Defined Networking: Wikipedia Says This I have found that all of the major players are bringing out products that qualify for a type of Software Defined Networking.  This is great because as Networking Administrators and Networking Engineers we can use controller based configuration in order to deploy networks faster and with more ease. ...

Error Device ae1 Not Found

I recently ran into a problem on an EX series switch - after already setting interfaces ae0 ae1 and ae2 up. Here was my configuration: [email protected]# show interfaces ae1 aggregated-ether-options { minimum-links 1; link-speed 10g; lacp { passive; periodic fast; } } unit 0 { description lab-mx1-ae1; family ethernet-switching { port-mode trunk; vlan { members ...

Problems after removing a node from a virtual chassis

After removing the EX-4500 from a virtual chassis configuration, I ran into a few problems within the config. I noticed something in the configuration that I thought was strange. [email protected]# set system commit factory-settings reset-virtual-chassis-configuration In order to get the node working properly after removing it from the cluster, I had to issue three commands. ...

Cisco Show Interfaces Rates

Cisco Interface Rates are typically buried inside of the show interfaces command output. However there are ways to filter in Cisco IOs and it is similar to the Linux CLI utility known as grep. Have you ever needed to show a specific port's rate - or show all ports at the same time? I know ...

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BGP Changes – how has this propagated?

Making BGP changes can be a daunting tasks and when there's an error during BGP changes the effects can be felt for an entire data-center over an extended period of time. As any Networking Engineer or Networking Administrator can tell you, it takes time for BGP to converge. It's not as quick as OSPF or ...

Open Source Networking Gear: Juniper’s Approach

DISCLAIMER: This is just my two-cents. Cisco has been opposed to open source whitebox networking from day one. There are many reasons for Cisco's stance on open source networking. I assume the largest roadblock here is that Cisco develops networking solutions and only shares partial functionality with the RFC. With EVPN usage on the rise ...

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Different JUNOS Modes

Getting used to the different modes is an essential part of learning JUNOS - I have learned the different Juniper JUNOS modes and they are included in this post. Root Login Prompt: lab-mx-1 (ttyu0) login: Shell Prompt: [email protected]% Enter the CLI (Command Line Interface): [email protected]% cli Operation mode within the CLI: [email protected]> Enter the Configuration ...

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Classful Subnetting Tricks

Here are some Classful Subnetting tricks that I learned while preparting for my CCNA Cert - I'm sure that brushing up on these can't hurt anything. Any time that you break these down you are subnetting  - so an example question would be if you have a subnet mask of 255.255.255.128 and you are subnetting 172.16.0.0 ...

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Classful IPv4 Address Definitions

What is a classful IPv4 address? The definitions of what this is will be included below. This will include the zero subnet or as many people in the industry will call it 'subnet-zero.' These definitions will also be using a CIDR notation. Directly below are unicast address space - this is the most important addressing used. ...

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Different Configuration Modes in JUNOS

There are different configuration modes in JUNOS you just have to look for them. It's important to know the difference during candidate configuration. There are times multiple administrators could be working on the same are of configuration at the same time and changes could be overwritten. Configuration types - In both JUNOS and IOS you ...