Dear Group,
I have an interesting scenario I'm trying to mock up in the lab and getting
nowhere fast.
I'm not good at ascii art so I'll try to describe the setup.
Imagine a core network with 4 routers, put them in a square, from the top
left clockwise, routerA, routerB, routerC, routerD.
These routers are connected in a full mesh and OSPF is configured.
Each router of course is in Area 0 but each router also has another area.
routerA - 1005
routerB - 1010
routerC - 1015
routerD - 1020
There is a fifth router at the bottom - routerE, connecting to routerC and
routerD with equal cost circuits using point-to-point addresses.
These transit routes are configured into OSPF, each network into the same
area as the core router where it terminates.
On a third ( Ethernet ) interface on routerE there are two networks, one as
primary and one as secondary. Let's use: primary 142.226.10.0 and secondary:
142.226.20.0
Policy routing has been configured to allow the prime network out the
routerE-routerD circuit and the secondary network has been configured to go
out the routerE-routerC circuit.
EIGRP has been configured for the networks on the inside of routerE and is
redistributed into OSPF with no auto-summary.
Now, when on either routerA or routerB, the inside routes are in the routing
table as available through both routers.
Objective.
Have 142.226.10.0 only advertised out routerE-routerD
and 142.226.20.0 only advertised out routerE-routerC
Discussion.
I have been reading madly about distribute lists and route-maps. It all
reads so simply but I think this particular situation is interesting because
of the two networks on one interface.
OSPF cannot use a distribute list and use the interface command (would have
been perfect).
OSPF cannot filter incoming updates (which would have been great on routerC
and routerD).
On the face of it this "seems" so simple - but - I'm stuck.
Any ideas welcome.
tia
Kevin Wigle
Using access-lists on the egress ports don't seem to do it either.
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