Tài liệu IRGP, EIGRP and RIP ppt

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

Debug ip igrp events

Debug ip rip events

EIGRP Authentication
Interface serial 0
ip authentication mode eigrp 5 md5
ip authentication key-chain eigrp 5 MyChain
!
key chain MyChain
key 1
key-string keynumber1
key 2
key-string keynumber2
Additional Commands

In IGRP: variance 2" would consider paths of x2
metric of equal path, so to load share.

EIGRP summarization: Done on the interface:
ip summary-address eigrp 100 10.1.0.0 255.255.0.0

On NBMA, turn off split-horizon:

No ip split-horizon eigrp XX
NOT
No ip split-horizon <- does not work for eigrp

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.

Default: metric = bandwidth + delay.

Mutual redistribution between igrp and eigrp of
the same automonous number is automatic
• The "mtric X" parameter in redistribution is
REQUIRED, otherwise RIP will drop the update
since it doesn't know how to deal with it.
• If the igrp or rip timer values need to be
adjusted, this has to be done on EVERY router
within that domain. Use "show ip protocols"
to see the timer values
• In IGRP, must use the "ip default-network
A.B.C.D" to redistribute a default network
into the igrp domain. This is required when
redistributing VLSM into FLSN so that the
FLSM subnets are accessible.
• EIGRP automatically summarizes at the
classful boundary. Make sure you turn off
auto summary with "no auto-summary"