Striving to reach that last 9? Looking for a way to increase your uptime while still being able to do maintenance on your network? Wish you could shutdown your OSPF neighbors like your BGP peers? Ok, enough sales talk. Achieving HA uptimes when you need to do maintenance is far from simple, even if you […]
ASA v8.4
Less than a year after changing the rules with ASA version 8.3, Cisco has released a new OS version 8.4. Since I won’t be covering the release notes word for word, you can find them here… I just wanted to go over the highlights. EtherChannel support – Lets start with he most exciting feature first. […]
IOS Embedded Packet Capture
Tired of setting up SPAN sessions? Need to do some packet analysis? Since IOS 12.4(20)T Cisco has made Embedded Packet Capture (EPC) available. EPC is a powerful troubleshooting tool that allows engineers to capture packets inside a Cisco router which can be essential in many troubleshooting scenarios. Configuring EPC The following steps will guide you […]
Nexus Virtual Port Channel (vPC)
The Nexus 7000 and 5000 series have taken port-channel functionality to the next level by enabling port-channels to exist between links that are connected to different devices. Virtual Port Channels (vPCs) were introduced in NX-OS v4.1(4). vPCs offer better bandwidth utilization while allowing for device level redundancy with faster convergence times compared to multiple port-channels […]
Setting up a Cisco Access Server
Whether your networking lab has 3 devices or 30 an access server, also commonly called a terminal server, is the vital connection between you and those devices. For this purpose most engineers use routers with asynchronous serial ports to connect to console (serial) ports on other devices. There are a couple of ways this can […]
HSRP, VRRPd, and GLBP Compared
In the world of first hop redundancy, we have plenty of choices. In order to make the right decision for your network you should know the basics regarding all three. The following chart provides a quick breakdown of each protocol. HSRP VRRPd GLBP Standard RFC2281 RFC3768 none Load Balancing No No Yes OSI Layer-3 Layer-3 […]
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