well, now that I've set it up, looked at it, and given it some thought, the answer is really quite simple. being a simple person myself, I like it when answers are simple. think "classful nature of eigrp"
see below ""Wei Zhu"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > ---EIGRP 100--(S0)---R1---(S1)--BGP AS 200--- > > R1 > S0 192.168.1.1 255.255.255.240 > S1 172.22.2.1 255.255.255.0 > S0 side run EIGRP, S1 side run BGP > > (1) > router eigrp 200 > network 192.168.1.0 > > router bgp > nei XXXX remote-as XXX > > R1 will send 192.168.1.0 route info through S0, but won't send the > 172.22.2.0 network info. > > (2) > ip route 0.0.0.0 0.0.0.0 S1 > > router eigrp 200 > network 192.168.1.0 > redistrib static > > Everything works fine > > (3) > If using network 0.0.0.0 to redistribute static info as: > ip route 0.0.0.0 0.0.0.0 S1 > > router eigrp 200 > network 192.168.1.0 > network 0.0.0.0 > > In addition of distribute the 0.0.0.0, R1 will also distribute 172.22.0.0 > (summury) network info through S0 first of all, you are not seeing the whole picture because of the limited numbers of interfaces you have in your basic setup. second of all, let me ask you a question. what exactly is 0.0.0.0? thirdly, having answered and understood what exactly 0.0.0.0 really represents, let me ask you another question. what happens when you put the entry "network 0.0.0.0" into the eigrp process? will eigrp still work if you were to now remove the "network 192.168.1.0" statement? why not? this is starting to feel like another homily. > It will also put 172.22.0.0/16 null0 route entry into its routing table. nature of the beast. I don't believe it is true of all protocols, but some of them will automatically place a summary to null 0 when a summary is advertised out. This is done as proof against black holes and helps prevent routing loops BTW, I enjoy your posts. Keep up the good work. > > Can anyone explain why this happens? > > Thanks > Wei Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=61181&t=61181 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
