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Router Configuration & lt; 4 & gt;

Source: Internet
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Configure the OSPF passive Interface

Target:

Configure the RIP passive interface to filter route entries to enhance network security.

Principle:

Use a passive interface. Do not send OSPF update and hello messages on the interface connecting to the server router.

Topology:

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Setp:

Step 1 configure IP Route Selection and IP address on the vro.

RA # config t

RA (config) # interface FastEthernet 0/0

RA (config-if) # ip address 172.16.1.5 255.255.255.252

RA (config) # interface FastEthernet 0/1

RA (config-if) # ip address 172.16.1.1 255.255.255.252

RA (config) # interface Loopback 0

RA (config-if) # ip address 172.16.3.1 255.255.255.0

RB (config) # interface FastEthernet 0/1

RB (config-if) # ip address 172.16.1.2 255.255.255.252

RB (config) # interface Loopback 0

RB (config-if) # ip address 172.16.2.1 255.255.255.0

RC (config) # interface FastEthernet 0/0

RC (config-if) # ip address 172.16.4.1 255.255.255.0

RC (config) # interface FastEthernet 0/1

RC (config-if) # I p address 172.16.1.6 255.255.255.252

Step 2 configure OSPF.

RA (config) # router ospf 10

RC (config-router) # network 172.16.1.0 0.0.0.3 area 0

RC (config-router) # network 172.16.1.4 0.0.0.3 area 0

RC (config-router) # network 172.16.3.0 0.0.255 area 0

RB (config) # router ospf 10

RB (config-router) # network 172.16.1.0 0.0.0.3 area 0

RB (config-router) # network 172.16.2.0 0.0.255 area 0

RC (config) # router ospf 10

RC (config-router) # network 172.16.1.4 0.0.0.3 area 0

RC (config-router) # network 172.16.4.0 0.0.0.255 area 0

Step 3 configure the passive interface.

RC (config-router) # passive-interface FastEthernet 0/0

Step 4 verify the test.

Use the debug ip ospf packet send to test the RIP update.

The following shows the test when step 2 is completed. Ospf update and hello messages are sent from the Fa0/0 interface, which affects both security and bandwidth.


RC # debug ip ospf packet send

Sep 7 01:56:21 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 48

Sep 7 01:56:26 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/0: 172.16.4.1, length 44

Sep 7 01:56:31 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 48

Sep 7 01:56:37 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/0: 172.16.4.1, length 44

Sep 7 01:56:40 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 48

Sep 7 01:56:47 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/0: 172.16.4.1, length 44

Sep 7 01:56:51 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 48

Sep 7 01:56:56 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/0: 172.16.4.1, length 44

Sep 7 01:57:01 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 48

Sep 7 01:57:07 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/0: 172.16.4.1, length 44

Sep 7 01:57:10 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 48

Sep 7 01:57:17 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/0: 172.16.4.1, length 44

Sep 7 01:57:21 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 48

The following shows the test when step 3 is completed. OSPF update and hello are only sent from the Fa0/1 interface, but not from the Fa0/0 interface.

RC # debug ip ospf packet send

Sep 7 01:58:16 RC % 7: SEND [LS-Upd]: 1 LSAs to destination 224.0.0.5

Sep 7 01:58:16 RC % 7: SEND [LS-Upd]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 76

Sep 7 01:58:21 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 48

Sep 7 01:58:31 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 48

Sep 7 01:58:40 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 48

Sep 7 01:58:50 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 48

Sep 7 01:58:59 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6,

Length 48

Sep 7 01:59:10 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 48

Sep 7 01:59:20 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 48

Sep 7 01:59:29 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 48

Sep 7 01:59:40 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 48

Sep 7 01:59:50 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 48

Sep 7 01:59:59 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 48

Sep 7 02:00:10 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 48

Sep 7 02:00:20 RC % 7: SEND [Hello]: To 224.0.0.5 via FastEthernet 0/1: 172.16.1.6, length 48

Reference Configuration]

RA # show running-config

Building configuration...

Current configuration: 699 bytes

!

Version RGNOS 10.1.00 (4), Release (18443) (Tue Jul 17 20:50:30 CST 2007-ubu1server)

Hostname RA

!

Enable secret 5 $1 $ db44 $ 8x67vy78Dz5pq1xD

!

Interface FastEthernet 0/0

Ip address 172.16.1.5 255.255.255.252

Duplex auto

Speed auto

!

Interface FastEthernet 0/1

Ip address 172.16.1.1 255.255.255.252

Duplex auto

Speed auto

!

Interface Loopback 0

Ip address 172.16.3.1 255.255.255.0

!

Router ospf 10


Network 172.16.1.0 0.0.0.3 area 0

Network 172.16.1.4 0.0.3 area 0

Network 172.16.3.0 0.0.0.255 area 0

!

Line con 0

Line aux 0

Line vty 0 4

Login

!

End!

RB # show running-config

Building configuration...

Current configuration: 634 bytes

!

Version RGNOS 10.1.00 (4), Release (18443) (Tue Jul 17 20:50:30 CST 2007-ubu1server)

Hostname RB

!

Enable secret 5 $1 $ db44 $ 8x67vy78Dz5pq1xD

!

Interface FastEthernet 0/0

Duplex auto

Speed auto

Shutdown

!

Interface FastEthernet 0/1

Ip address 172.16.1.2 255.255.255.252

Duplex auto

Speed auto

!

Interface Loopback 0

Ip address 172.16.2.1 255.255.255.0

!

Router ospf 10

Network 172.16.1.0 0.0.0.3 area 0

Network 172.16.2.0 0.0.0.255 area 0

!

!

Line con 0

Line aux 0

Line vty 0 4

Login


!

End

RC # show running-config

Building configuration...

Current configuration: 660 bytes

!

Version RGNOS 10.1.00 (4), Release (18443) (Tue Jul 17 20:50:30 CST 2007-ubu1server)

Hostname RC

!

Enable secret 5 $1 $ db44 $ 8x67vy78Dz5pq1xD

!

Interface FastEthernet 0/0

Ip address 172.16.4.1 255.255.255.0

Duplex auto

Speed auto

!

Interface FastEthernet 0/1

Ip address 172.16.1.6 255.255.255.252

Duplex auto

Speed auto

!

Interface Loopback 0

!

Router ospf 10

Passive-interface FastEthernet 0/0

Network 172.16.1.4 0.0.3 area 0

Network 172.16.4.0 0.0.0.255 area 0

!

Line con 0

Line aux 0

Line vty 0 4

Login



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