EIGRP redistribute static default route without redistribution

[randms2610]

Hi,

I am having a multiple routers running EIGRP... in one of my router (R1), i have a static ip route 0.0.0.0 0.0.0.0 null0 , and in my EIGRP configuration i dont have any redistribution command

I want to ask how come this default route is redistributed to other EIGRP neighbors without any redistribution command?

i'm asking this out of my curiosity and i just want to know how is this possible to happen

Here's snippet of the config on R1, nothing fancy

R1#sh run | sec ip route
ip route 0.0.0.0 0.0.0.0 Null0
R1#sh run | sec eigrp
router eigrp 100
 network 0.0.0.0
 no auto-summary
R1#

and here's the snippet of routing table from my other eigrp neigbor

R2#sh ip route | sec 0.0.0.0/0
D*   0.0.0.0/0 [90/28160] via 10.12.12.1, 00:24:58, FastEthernet0/0
R2#sh ip route 0.0.0.0
Routing entry for 0.0.0.0/0, supernet
  Known via "eigrp 100", distance 90, metric 28160, candidate default path, type internal
  Redistributing via eigrp 100
  Last update from 10.12.12.1 on FastEthernet0/0, 00:25:07 ago
  Routing Descriptor Blocks:
  * 10.12.12.1, from 10.12.12.1, 00:25:07 ago, via FastEthernet0/0
      Route metric is 28160, traffic share count is 1
      Total delay is 100 microseconds, minimum bandwidth is 100000 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 1/255, Hops 1

tried restarting all router but then the route still appears. once again, i'm not asking for a solution here.... i know this can be solved by applying route-map filter, etc.... i just want to know how is this possible to happen. is this a bug or some EIGRP behavior that I missed during my CCNA training? can someone clarify?

Thanks!

[Mark Malone · Accepted solution]

Hi its because you have a network statement 0.0.0.0 that cause redistribution automatically in EIGRP of default route , this is just 1 of the ways you can redistribute default in EIGRP its very flexible IGP

[randms2610]

You are right, I have just confirmed it. It is because i have set the next hop for the static default route using interface instead of gateway IP address. The way that I intentionally turned on EIGRP on all interfaces using the "network 0.0.0.0" statement causing the "ip route 0.0.0.0 0.0.0.0 null0" to be redistributed automatically to my EIGRP peers, even without redistribute statement.

I definitely have to re-open my ccna book. thanks for the clear and straight-to-the-point answer