Understand RIP Timers Once For All!

Cisco’s RIP implementation defines 4 times tight to one periodic update interval and 3 states: invalid, hold-down and flush.

The misleading information is that they are referred to as “timers” in configuration part!

Apart from the periodic update interval the other times correspond to exactly 2 timers that are attached to the route prefix and to path descriptors respectively. Continue reading “Understand RIP Timers Once For All!”

Aruba’s Adaptive Radio Management for IEEE 802.11 Wlan networks

Fig. 1: Example of a WLAN coverage area heatmap

Aruba’s Adaptive Radio Management, ARM is responsible of transmit power management and planning of radio channels to access points.

It maintains two measures for every channel : a coverage index and an interference index [2] [3].

Transmit power control over a given channel is based mainly on the coverage index. Continue reading “Aruba’s Adaptive Radio Management for IEEE 802.11 Wlan networks”

10 security measures against 10 attacks in a LAN network – Part I

An Ethernet switch is the central element of a LAN network and operates at data link OSI layer.

Every switch port defines a collision domain and can extend a broadcast or broadcast frame domain that is stopped by a router routed interface that operates at network OSI layer.

By default switches support one broadcast domain that can be tight to the default VLAN. VLANs, Virtual LANs, allow extension of this number to no Continue reading “10 security measures against 10 attacks in a LAN network – Part I”

Transmit Power Control in IEEE 802.11 Cisco WLAN networks

Transmit Power Control in IEEE 802.11 Cisco WLAN networks
Fig. 1: Wifi everywhere!

TPC stands for Transmit Power Control. It’s a one of Cisco RRM, Radio Resources Management, techniques that are aimed at tackling interference, cross and co-channel, in Wlan networks.

RRM: TPC, CHD and DCA

It works tightly with CHD, Covergate Hole Detection, to optimize transmit power. TPC tends to minimize the transmit power and CHD to eliminate coverage holes by increasing it.
Continue reading “Transmit Power Control in IEEE 802.11 Cisco WLAN networks”