There are a couple ways to do this, but first let me make sure I understand
what you want to do.
Lets say for instance that "Server A" is really a firewall or external
gateway to the Internet. You want any traffic that you do not claim in your
routing tables to flow to this device.
On the router closest to that device, you would put:
ip route 0.0.0.0 0.0.0.0 10.1.1.2
...when a default route goes into a table, it becomes a 'default
candidate'. Some routing protocols will only propogate default candidates
if they fall on a classful boundary.
So for instance, since you are
using
10.x.x.x in your example, you cannot make that your default
candidate or things just won't make sense in a larger network.
So to get around this problem, you need to distribute something else out
that can be used as a default candidate - for instance, 192.168.1.0/24, and
is unique enough that everyone can agree on the specific route.
Example:
(Default Traffic EIGRP Router)
ip route 192.168.1.0 255.255.255.0 Null0
ip default-network 192.168.1.0
router eigrp 1
redistribute static metric 64 20000 255 1 1500
network 10.0.0.0
(Other EIGRP Routers in the Network)
Nothing. They should pick up the default candidate.
If you do a 'show ip route' on router B, you should now see your 192.168.1.0
route and it should be tagged as a default candidate. As long as you don't
have a better default candidate in the table (take out your ip route 0.0.0.0
0.0.0.0 x.x.x.x), all traffic will flow downhill to the router holding that
route along the path to 192.168.1.0.
So let's extend this beyond just two routers. Let's say you have a
corporate core network and you want all traffic to head down there from
anywhere in the network that there is no specific route for. Why would you
do this? Again, if you either default route to the Internet, or your core
knows about routes in other AS's that you don't propogate out into the
routing table. You can suck all the traffic down, and then the core will
know how to get it the rest of the way, without having to send the route to
the rest of the locations. You can now "stub" off all of the other
countries and only send them your default network. They can each do their
thing, and yet everything will flow back to you if they don't know how to
get to it in their table (for instance, to get to another country).
Mike
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=14600&t=14593
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