RIP, EIGRP & IGRP

Key Commands Shows and Debugs

Router rip
Network A.B.C.D
Default information originate
Redistribute igrp metric 3

Passive-interface serial 0
Neighbor A.B.C.D

Router igrp 100
Network A.B.C.D
Redistribute rip metric 1544 10 255 1 1500

Passive-interface ethernet 0
Neighbor A.B.C.D
!
ip default-network A.B.C.D

Router eigrp 100
Network A.B.C.D
Redistribute rip metric 1544 10 255 1 1500

NO AUTO-SUMMARY

Show ip protocols
Show ip eigrp neighbor
Show ip eigrp topology
Debug ip igrp transaction

Eigrp uses multicast address 224.0.0.10 on broadcast
media

On NBMA: ip split-horizon is disabled by default on
ip physical interfaces, but NOT on point-to-point or
point-to-multiploint interfaces. In those cases,
make sure you do a "no ip split-horizon" on those
interfaces at the hub only
, AND put a distribution
list on the spoke router not to listen for
advertisements about the internal networks it
covers.

See check-list on Redistribution!

Spot The Issue Notes
The "default information originate" command in
rip will inject a 0.0.0.0 route within the rip
domain. This is especially inportant when
redistributing from VLSM to FLSM and needing to
reach all networks without configuring a static
default route.

When a static 0.0.0.0 route is defined on a
router, rip will automatically redistribute it
into the rip domain.

Max hop count of 15 in rip, 100 for igrp. IGRP
uses hop count for loop avoidance only. Uses
metrics for route path decision.