21 nov. 2011

RIP Overview


RIP overview

Distance Vector IGP, split-horizon, poison reverse and count to infinity, UDP/520
RIPv1 : broadcast, classfull
RIPv2 : 224.0.0.9, classless
max Hop-count = 16

Default :
RIPv1, send RIPv1 updates, listen to RIPv1 and RIPv2 updates

Modify the version
Use commands : version , ip rip receive version  and ip rip send version

Split-Horizon
Updates received in an interface won’t be  sent back out the same interface -> Undesirable on Partial Mesh NBMA (FR H&S)
Split-Horizon is enabled by default except on FR main interface.
To disable Split-Horizon : no ip split-horizon.

RIP Timers
Global cmd : timer basic [update] [invalid] [holddown] [flush]
Update = 30s
invalid and holddown = 180s (so invalid=holddown)
flush = 240s
Interface level : ip rip advertise [interval]


NTP - ACL

NTP - Network Time Protocol Packet types: -  Control messages : don't bother with this. -  NTP request/update messages: used for time sy...