Saturday, July 8, 2017
Distribution list
Distribution list
for this lab, we gonna use same topology and setup from previous lab Redistribution RIP Ver2 - OSPF
1. First we gonna stop route to 172.16.2.x and 172.16.3.x to be advertised into R2
on R1 create access-list to match the two address
deny 172.16.3.0 0.0.0.255
deny 172.16.4.0 0.0.0.255
permit any //dont forget this, by default access-list deny all
then apply inside the routing protocol on specific interface, in this case, go to RIP and apply on the R1 interface serial 0/0
router rip
version 2
network 10.0.0.0
network 172.16.0.0
distribute-list ROUTE_FILTER out Serial0/0
no auto-summary
now check on R2, R3 and R4, you should see no route to this two network
2. Now we gonna apply distribution list where the filter is applied between routing protocol, here we gonna filter network 172.16.1.x coming from RIP from being advertised into OSPF
on R2, create access-list for this network
ip access-list standard ROUTE_FILTER
deny 172.16.1.0 0.0.0.255
permit any
because OSPF dont want specific network to advertise to him, we gonna configure this inside the OSPF process and specific from what routing protocol and network he dont want any update
router ospf 1
router-id 2.2.2.2
log-adjacency-changes
redistribute rip subnets
network 10.0.0.0 0.255.255.255 area 0
distribute-list ROUTE_FILTER2 out rip
check on the R3, R4. there should be no route path to 172.16.1.x
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