==============================EIGRP adver_default route==========
1.
ip route 0.0.0.0 0.0.0.0 null0
Router eigrp 100
Network 0.0.0.0
= >> In this case
the default route will show as an "internal"
Eigrp route.
======================================================================
2.
Ip route 0.0.0.0 0.0.0.0 null0
Router eigrp 100
Redistribute static
=>> In this case
the default route will show as an "external"
Eigrp route "EX".
======================================================================
3.
" under a given interface
":
# ip summary-address
eigrp 1 0.0.0.0 0.0.0.0
=>> In this case
the default route will show as an "internal"
Eigrp route
Note : creat null0
with AD = 5 in routing table
Để
không thấy route null 0 trong routing table thì khi summary ta cho AD = 255
#
ip summary-address eigrp 1 0.0.0.0 0.0.0.0 255
=======================================================================
4. IP default-network
1.0.0.0
>>
note : The network can be any network,but must be a classful network and NOT a
subnet
Loopback
interface or any interface
Router eigrp 100
Network 1.0.0.0
+++++++++++++++++++++++++
+
show ip route eigrp +
+ +
+ D*
1.0.0.0/8 +
+++++++++++++++++++++++++
>> Note : the
"*" after the letter D.==> " candidate default "
*
Your need to have access to network 1.0.0.0, but it
not
want to use it as a candidate default
should
be configured as follows:
+-----------------------------------
------------+
+Router eigrp
100 +
+ +
+ No default-information allowed
in +
+------------------------------------------------+
*After
the above configuration, if you check your routing table it should
look
like the following:
+++++++++++++++++++++++++
+
show ip route eigrp +
+ +
+ D
1.0.0.0/8 +
+++++++++++++++++++++++++
>> Note : the "*" is gone and network 1.0.0.0 is no longer used
as the candidate
default.
==================================================================
Gateways of last resort selected using the
ip default-network
command are propagated differently
depending on which routing protocol
is propagating the default route. For IGRP
and EIGRP to propagate the
route, the network specified by the ip
default-network command
must be known to IGRP or EIGRP. This means
the network must be an IGRP-
or EIGRP-derived network in the routing
table, or the static route used
to generate the route to the network must
be redistributed into IGRP or
EIGRP, or advertised into these protocols
using the network command.
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