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
"there ain't no such thing as a free lunch"
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=61302&t=61302
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