Archive for March, 2010

To portfast or not so fast?

| March 25th, 2010 | No Comments »

Cisco's portfast feature, which later became an implemented feature in RSTP (802.1w) is an interesting feature. It's purpose is to bring an interfaces state to a "Forward" state as quickly as possible. This, if you are using multiple switches and spanning-tree is being utilized. But what if you're not? How quickly does the interface go ...

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PPP no keepalives

| March 25th, 2010 | No Comments »

While playing with my simulated serial WAN link. I thought I could simulate the link going down by turning off keepalives on one of the serial interfaces. After waiting 5, 10 minutes and still being able to ping across, I decided to turn off the other keepalive coming from the other switch! Low and behold, the ...

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