""The Long and Winding Road"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > 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?
oh, you know what, while composing a reply to cebuano, I realized - you probably have automaticic summarization enabled under eigrp enter the command "no auto-summary" and watch the staic to null 0 disappear. > > > > > > > > > > > Thanks > > Wei Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=61186&t=61186 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
