I read some document suggesting to use ip route 0.0.0.0 and network 0.0.0.0 to redistribute static route in eigrp, in this case, it seems not a good solution, instead using redistribute static can do the same job.
Thanks Wei ----- Original Message ----- From: "The Long and Winding Road" To: Sent: Thursday, January 16, 2003 10:00 PM Subject: Re: EIGRP network 0.0.0.0 to redistribute static route [7:61241] > ""Wei Zhu"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > Thank you everyone for your response, > > > > The reason I am confused is not becasuse the NULL0 in routing table, > that's > > the way eigrp does. > > only if you have automatic summarization enabled. if you enter the command > "no auto-summary" under the eigrp process, the route to null 0 will > disappear. > > > > The reason is when I set the "network 0.0.0.0" in eigrp, it distribute the > > 172.22.0.0 network to S0 side(I have another router running eigrp at S0 > > side, its routing table shows up 172.22.0.0 or 172.22.2.0/24 when I enable > > no summary). > > > > > Chuck, does network 0.0.0.0 mean to enable all interface to participate > into > > route distribution? > > > starting with IOS 12.0, Cisco made it possible to enter interfaces ( not > whole networks ) into the eigrp process similar to the way you enter ospf > interfaces into the ospf process. > > recall that with ospf you can use the command "network 0.0.0.0 > 255.255.255.255 area x" to place all interfaces into the ospf process. > > apparently eigrp can be handled the same way. when you used the comand > "network 0.0.0.0" you placed all interfaces into the eigrp process. > > my routers are asleep at the moment, but it occurs to me to look into > whether or not ospf will accept just the 0.0.0.0 notation. > > > > My idea is to put S0 in eigrp and S1 in BGP, while only set "network > > 192.168.1.0" won't put S1 into eigrp, thus won't distribute the 172.22.0.0 > > network info into S0 side. > > yep. > > > > > I am using IOS12.1.5(10T). > > > > Regards > > Wei > > > > ----- Original Message ----- > > From: "The Long and Winding Road" > > To: > > Sent: Thursday, January 16, 2003 2:37 AM > > Subject: Re: EIGRP network 0.0.0.0 to redistribute static route [7:61186] > > > > > > > ""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=61243&t=61243 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
