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Re: Random observations about EIGRP networks [7:61302] posted 01/18/2003
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Awesome Observation, Chuck!!

Keep up the good work!!

>From: "The Long and Winding Road" >Reply-To: "The Long and Winding Road"
>To: cisco@xxxxxxxxxxxxxx >Subject: Random observations about EIGRP
networks [7:61302] >Date: Sat, 18 Jan 2003 18:16:24 GMT > >based on a
recent thread regarding the 0.0.0.0 network > >since about 12.0 or so,
when placing networks into EIGRP, one can use a >wildcard mask. >
>example: > >router eigrp 100 >network 1.1.0.0 0.0.255.255 > >which
places 1.1.0.0/16 into the eigrp process. > >I did a bit of digging
around both the Doc CD and the TAC site, but >surprisingly, I can find
nothing in the way of documentation for this >feature. > >following are a
couple of things I did, and the results. > >Router 3 >-------------
>interface Loopback101 > ip address 7.50.1.1 255.255.255.0 >! >interface
Loopback102 > ip address 6.50.1.1 255.255.255.0 >! >interface Loopback103
> ip address 5.50.1.1 255.255.255.0 >! >interface Loopback104 > ip
address 4.50.1.1 255.255.255.0 >! >interface Loopback201 > ip address
168.95.1.5 255.255.255.0 >! >interface Loopback202 > ip address
170.177.1.5 255.255.255.0 >! >interface Loopback203 > ip address
171.17.47.5 255.255.255.0 >! >interface Loopback204 > ip address
169.30.101.5 255.255.255.0 >! >interface TokenRing0 > ip address
199.1.1.2 255.255.255.252 > ring-speed 4 >! >router eigrp 200 > network
4.0.0.0 3.255.255.255 > network 168.0.0.0 3.255.255.255 > network
199.1.1.0 0.0.0.3 > no auto-summary > no eigrp log-neighbor-changes >!
>Router 4 routing table >------------------------------ >Router_4#ir ei >
170.177.0.0/24 is subnetted, 1 subnets >D 170.177.1.0 [90/832000] via
199.1.1.2, 10:47:03, TokenRing0 > 171.17.0.0/24 is subnetted, 1 subnets
>D 171.17.47.0 [90/832000] via 199.1.1.2, 10:47:03, TokenRing0 >
168.95.0.0/24 is subnetted, 1 subnets >D 168.95.1.0 [90/832000] via
199.1.1.2, 10:47:03, TokenRing0 > 169.30.0.0/24 is subnetted, 1 subnets
>D 169.30.101.0 [90/832000] via 199.1.1.2, 10:47:03, TokenRing0 >
4.0.0.0/24 is subnetted, 1 subnets >D 4.50.1.0 [90/832000] via 199.1.1.2,
10:47:03, TokenRing0 > 5.0.0.0/24 is subnetted, 1 subnets >D 5.50.1.0
[90/832000] via 199.1.1.2, 10:47:03, TokenRing0 > 6.0.0.0/24 is
subnetted, 1 subnets >D 6.50.1.0 [90/832000] via 199.1.1.2, 10:47:03,
TokenRing0 > 7.0.0.0/24 is subnetted, 1 subnets >D 7.50.1.0 [90/832000]
via 199.1.1.2, 10:47:03, TokenRing0 >Router_4# > >I find the notation
that 4.0.0.0/24 is subnetted with one subnet interesting > >Note also
that the wildcard mask bits must be contiguous, which is one of >the
idiot proofing features introduced in 12.0 Takes all the fun out of
>wildcard masking, both for EIGRP and for OSPF. > >As we discussed
elsewhere, the command "network 0.0.0.0" places all >connected
interfaces, and thus all connected networks, into the eigrp >process. if
automatic summarization is enabled, then routes to null0 are >generated.
> >I'm not sure there is a lot of wisdome to be found in this kind of
study. >The maks, and therefore the placing of interfaces rather than
entire >classful networks, into the routing process allows for cleaner
operation. >otherwise, it is something of a bother. >-- >TANSTAAFL
misconduct and Nondisclosure violations to abuse@xxxxxxxxxxxxxx

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