Category Archives: Certification

CCNP ROUTE Study – EIGRP Passive Interfaces

We know that enabling EIGRP on an interface has two effects: EIGRP Hello packets will start being sent out of the interface to multicast  address 224.0.0.10.  This means that neighbour relationships (adjacencies) can be formed with other routers directly connected to the same subnet and using the same EIGRP AS number the network that the […]

Adventures in VOIP (or how to make Avaya phones & Cisco switches play nicely)

  I’m currently working on an Avaya VOIP implementation, and thought I’d blog about some of the configuration steps involved along the way. First of all let’s set the scene with a massively oversimplified network diagram that shows how things hook together.  We have a DHCP server and an Avaya CS1000E Communications Server, a Cisco […]