Lindsay Hill network control, visibility, management

How Long Before CCIE SDN?

Cisco made some announcements about SDN certifications at Cisco Live US, in June this year. These didn’t seem to get a lot of attention at the time, perhaps due to little detail being available. A few more things have started to come out, but it’s still not full released. What might these SDN certifications be like, and will they be in demand?

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"Black Tuesday" - Isn't it Just Business as Usual?

Microsoft patches are released on a (mostly) monthly cycle, and other vendors have started following suit. When this first happened, people treated it like a major event. But I think that it is now treated as “Business As Usual”, and maybe it’s time for the headline-writers to realise this.

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DHCPv6 Client on Juniper SRX-110

Juniper recently released 12.1X45-D10 for the SRX-110. The key new feature for me was DHCPv6 Client support - finally! It’s still new, and buggy, and I wouldn’t rush it into production, but if you need DHCPv6 client support, it’s here. These are my notes on how I’ve configured it to get it working.

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IMC - Changing Predefined Device Model Definitions

IMC has a predefined list of over 6,000 devices. This list maps sysOIDs to devices, so when you add a new device to IMC, it will say “this is a Cisco Catalyst 3560 Switch”, or a “HP MSM 760 Wireless Controller”, etc. Here’s a sample of what that list looks like:

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Managing Hybrid Networks

The most interesting talk I attended at HP Discover in Las Vegas this year was Ken Gott’s talk on “Management of Software Defined Networks and Hybrid Environments with HP IMC.” This talk outlined the architecture for how HP plans to manage hybrid network environments using IMC, and gave us a quick demo of the code.

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Configuring Timezones on IOS, ProVision and Comware

Timezones can be complicated things - every country has its own set of rules around how to decide what time it currently is - and those rules change, frequently. Modern Operating Systems have systems in place for handling those changes. Give it a location, it will deal with the rest. Unfortunately, network devices don’t have those systems, and we need to explicitly tell them how to work out what the current local time is, and when to change it to Daylight Savings Time. Here’s how to do that for Cisco IOS, HP ProVision, and HP Comware systems.

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IMC - Clearing up Misconceptions about Templates

I’d just like to clear up a little confusion that people have about HP IMC templates, and how they are used. Templates can be used to define credentials for different access methods - SNMP, Telnet, SSH, WMI, PowerShell, SOAP. You can define multiple templates for each access method, and they can have a range of options - e.g. Username/Password, Username/Password + enable password, Private Key + enable password, SNMPv3-Priv-Aes128-Auth-Sha, etc.

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IMC - Network Discovery Methods

Auto-discovery can help you populate your NMS, and keep it up to date. HP IMC supports several methods of adding devices - either by manually adding them, or getting IMC to automatically discover them. Here’s an overview of the options available to us:

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IMC NTA Licensing - Watch the Fine Print

HP IMC has an optional add-on module for NetFlow/sFlow Analysis called “Network Traffic Analyzer (NTA).” This comes in 10-, 20- or 50-node license packs. Based on the license names, you might think that it’s as simple as counting up the number of NetFlow-generating devices in your network, and purchasing sufficient licenses. Not quite so fast.

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WMI Corruption on Citrix XenApp Servers

The Windows WMI repository can become corrupted on Windows 2008 R2 servers being used with XenApp. WMI corruption can cause problems for monitoring systems, and potentially some applications. Here's how to fix the issue. (Read more...)