Posts Tagged ‘routing table’

Multitenancy on Dell Networking Switches via VRF-lite

Wednesday, October 29th, 2014

Check out the Dell Networking: Multitenancy with VRF-lite white paper. I describe in detail how multitenency can be achieved on supported Dell Networking switches via Virtual Routing and Forwarding (VRF). VRF-lite supports multitenancy by allowing multiple different routing tables within one physical L3 switch/router. This allows for a multitenant network without having to buy additional hardware. In the diagram directly below, each color represents a different customer tenant utilizing the same IP address space (overlapping IP addresses). Such a setup can also be useful for development and testing where traffic isolation is needed; the overlapping IP addresses can be used for ensuring consistency between each development/test environment. (more…)


EIGRP – Best Path Selection

Tuesday, March 27th, 2012

By default EIGRP uses bandwidth and delay of the line to determine the best path to a remote network. However, if desired, EIGRP can use a composite of four metrics: bandwidth, delay, reliability, and load. Maximum transmission unit (MTU) is not used in EIGRP calculations but is a required parameter in some EIGRP-related commands. Also, by default, EIGRP will provide equal-cost load balancing across up to four links. You can disable load balancing by setting the ‘maximum-paths’ to ’1′. In this lab I use four Cisco 3725 routers [IOS 12.4(15)T10] to demonstrate EIGRP path selection behavior on Cisco routers. (more…)