Now, OSPF is a link state protocol. So filtering routes from the route table
doesn't filter them from the Link state database.
It impacts the local router but doesn't impact the overall domain until a
packet hits that local router - would that be correct?
So the neighbors getting updates on that particular route that you've filter
from your local route table through a distribute list would still get the
LSA even if that local router wasn't putting the route in its route table.
My example is this: I'm told in the practice lab to prefer the RIP routes
('prefer' I'm learning should automatically mean 'ADMINISTRATIVE DISTANCE')
for some particular routes over the OSPF routes.
Here is what I did:
R5(config-router)#do sho run | s access-list
ip access-list standard FilterOSPF
deny 100.0.0.36
deny 100.0.0.37
deny 100.0.0.38
deny 100.0.0.35
deny 140.10.124.0 0.0.0.255
deny 140.10.134.0 0.0.0.255
deny 140.10.112.0 0.0.3.255
permit any
This provided me with the end goal:
R5(config-router)#do sho ip route rip
100.0.0.0/32 is subnetted, 12 subnets
R 100.0.0.36 [120/4] via 140.11.5.1, 00:00:04, FastEthernet0/0
R 100.0.0.37 [120/2] via 140.11.5.1, 00:00:04, FastEthernet0/0
R 100.0.0.38 [120/3] via 140.11.5.1, 00:00:04, FastEthernet0/0
R 100.0.0.35 [120/1] via 140.11.5.1, 00:00:04, FastEthernet0/0
140.10.0.0/16 is variably subnetted, 17 subnets, 4 masks
R 140.10.134.0/24 [120/2] via 140.11.5.1, 00:00:04, FastEthernet0/0
R 140.10.112.0/24 [120/1] via 140.11.5.1, 00:00:04, FastEthernet0/0
R 140.10.113.0/24 [120/1] via 140.11.5.1, 00:00:04, FastEthernet0/0
R 140.10.124.0/24 [120/3] via 140.11.5.1, 00:00:04, FastEthernet0/0
The proctor guide says that I should have changed the admin distance for
those route entries to something lower than OSPF (109). I think that's
probably better but would my solution have gotten me the points for the
task?
Ugh.test is next week. I'm learning - slowly that is VERY important to
actually read the lab. =-)
-Mike
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