Yes, you are right.But if without that command, the routers will auto-summary the routing.then the another router found a main network routing,say "172.16.0.0", because it connect the "172.16.10.0" dirctly, then it will ignore the "172.16.0.0" routing, In its view, it connect the "172.16.0.0" dirctly. So, the guy can not ping the router from the other router. Chuck Larrieu wrote: > > The auto-summary and no auto-summary commands have nothing to do with the > ability of EIGRP to work with VLSM. > > In EIGRP, automatic summarization takes place in the routing process when > several subnets are entered into the process, subnets which will > automatically be summarized at the higher classful boundary. > > For example: > > Router eigrp 100 > Network 172.16.10.0 > Network 172.16.25.0 > Network 172.16.204.0 > > The default auto-summary would summarize this as 172.16.0.0 > > In theory you should be able to turn off auto-summarization so that you can > perform CIDR summarization on an interface by interface basis. > > Interface s0 > Summary-address eigrp 100 172.0.0.0 255.0.0.0 > > For this to work, auto-summarization must be disabled using the no > auto-summary command under the router process. > > EIGRP will support the subnets below with no problem. > > Chuck > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of > cisco_ccna > Sent: Saturday, August 26, 2000 9:06 PM > To: [EMAIL PROTECTED] > Subject: Re: dividing up the same subnet on 2 diff segments > > << File: vcard.vcf >> Hi, > > you need use the command of "no auto-summary", to let router support the > VLSM. > > [EMAIL PROTECTED] wrote: > > > > Hi > > > > I have a question? I have two routers okay and I have routing turned on > > both of them (EIGRP). lets say I want to use 10.1.1.0 and I want to be > able > > to to split this subnet into two networks, I know you can use IP > subnet-zero > > to do this, but I want to address the first router E0 Interface with > 10.1.1.1 > > to 10.1.1.126 and the second router E0 with the second half 10.1.1.127 to > > 10.1.1.254 ok. Now I want to be able to ping each others gateway. > > > > Can I or should I be able to ping each others gateway and have one flat > > segment between 2 router Ethernet segment. Do I need to bridge this? these > > two segments together. > > > > Brian > > Email Address [EMAIL PROTECTED] > > > > ___________________________________ > > UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html > > FAQ, list archives, and subscription info: http://www.groupstudy.com > > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > ___________________________________ > UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html > FAQ, list archives, and subscription info: http://www.groupstudy.com > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
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