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Filtering with Route Map and prefix-list
I have EIGRP routes advertised from R1 to R2 as shown below:
on R1 I have configured route map and prefix list to block (filter out)network 172.16.0.0 /16 le 26, but it does not seem to work
Any Help ?
thank you
R2#sh ip route eigrp 1
10.0.0.0/8 is variably subnetted, 13 subnets, 7 masks
D 10.10.10.10/32
[90/156160] via 192.168.12.1, 00:00:09, FastEthernet0/0
20.0.0.0/32 is subnetted, 1 subnets
D 20.20.20.20 [90/156160] via 192.168.12.1, 00:00:09, FastEthernet0/0
172.16.0.0/16 is variably subnetted, 5 subnets, 3 masks
D 172.16.0.0/24 [90/156160] via 192.168.12.1, 00:00:09, FastEthernet0/0
D 172.16.2.0/24 [90/156160] via 192.168.12.1, 00:00:09, FastEthernet0/0
D 172.16.3.0/24 [90/156160] via 192.168.12.1, 00:00:09, FastEthernet0/0
D 172.16.12.0/22
[90/156160] via 192.168.12.1, 00:00:09, FastEthernet0/0
D 172.16.22.0/26
[90/156160] via 192.168.12.1, 00:00:09, FastEthernet0/0
R2#
on R1 I have configured route map and prefix list to block (filter out)network 172.16.0.0 /16 le 26, but it does not seem to work
route-map FILTER_OUT deny 10
match ip address prefix-list SMALL_PREFIXES
ip prefix-list SMALL_PREFIXES seq 10 permit 172.16.0.0/16 le 26
route-map FILTER_OUT permit 20
Any Help ?
thank you
Asked:
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4
2
2- +1
5 Solutions
Try this on router R1
R1(config)# access-list 1 permit 172.16.0.0 0.0.255.255
R1(config)#
R1(config)# router eigrp 1
R1(config-router)# distribute-list 1 out Exit-Interface
R1(config-router)#
R1(config)# access-list 1 permit 172.16.0.0 0.0.255.255
R1(config)#
R1(config)# router eigrp 1
R1(config-router)# distribute-list 1 out Exit-Interface
R1(config-router)#
route-map FILTER_OUT deny 10
match ip address prefix-list SMALL_PREFIXES
ip prefix-list SMALL_PREFIXES seq 10 permit 172.16.0.0/16 le 26
route-map FILTER_OUT permit 20
it is route map that matches a prefix list
The configuration which i have written here, doesn’t display 172.16.0.0 network routes in R2 routing table. It will filter out after exiting at R1
Tested it, works properly. Compare it to your configuration.
R1:
R2:
R1:
interface Loopback0
ip address 172.16.0.1 255.255.255.0
!
interface Loopback1
ip address 172.16.3.1 255.255.255.0
!
interface Loopback2
ip address 172.16.2.1 255.255.255.240
!
interface Loopback3
ip address 172.16.4.1 255.255.255.0
!
interface FastEthernet0/0
ip address 192.168.0.1 255.255.255.0
!
router eigrp 1
network 0.0.0.0
distribute-list route-map FILTER_OUT out
no auto-summary
!
ip prefix-list SMALL_PREFIXES seq 10 permit 172.16.0.0/16 le 26
!
route-map FILTER_OUT deny 10
match ip address prefix-list SMALL_PREFIXES
!
route-map FILTER_OUT permit 20
R1#sh ip route
172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks
C 172.16.4.0/24 is directly connected, Loopback3
C 172.16.0.0/24 is directly connected, Loopback0
C 172.16.2.0/28 is directly connected, Loopback2
C 172.16.3.0/24 is directly connected, Loopback1
C 192.168.0.0/24 is directly connected, FastEthernet0/0
R2:
interface FastEthernet0/0
ip address 192.168.0.2 255.255.255.0
!
router eigrp 1
network 0.0.0.0
no auto-summary
R2(config-router)#do sh ip route
172.16.0.0/28 is subnetted, 1 subnets
D 172.16.2.0 [90/409600] via 192.168.0.1, 00:00:02, FastEthernet0/0
C 192.168.0.0/24 is directly connected, FastEthernet0/0
router eigrp 1
network 0.0.0.0
distribute-list route-map FILTER_OUT out
no auto-summary
I did not have the Distribute-List in my Configuration. Do I have to add it ?
network 0.0.0.0
distribute-list route-map FILTER_OUT out
no auto-summary
I did not have the Distribute-List in my Configuration. Do I have to add it ?
Without distribution list will not work. :)
Distribute list actually applies filtering to eigrp.
PS
You had it in your configuration few days ago - in this question.
Distribute list actually applies filtering to eigrp.
PS
You had it in your configuration few days ago - in this question.
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It will look like this:
NewYork(config-router)#dis
NewYork(config-router)#dis
<1-199> IP access list number
<1300-2699> IP expanded access list number
WORD Access-list name
gateway Filtering incoming address updates based on gateway
prefix Filter prefixes in address updates
route-map Filter prefixes based on the route-map