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New Member

Area BACKBONE(0) (Inactive)

Hi all,

i'm new to this Cisco world so bare with me please. i'm trying to configure OSPF between two Cisco 2800 series and i'm unable to see the neighbor routers. the design is not fully completed since i'm waiting for my second ASA and ISP link but i'm trying to get as much done and configure both routers. i had bgp configured and working but removed it to try to isolate the issue. i will be adding it back.

here is brief of the topology i have and will be implementing. see attachment for a more detail drawing. 

Thanks in advance for the help.

 

ISP1[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[-Future ISP2

ASA 5505[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[Future ASA 5505

R1<--------crossover cable------------->R2

Switch1[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[switch2

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

R2 config

interface GigabitEthernet0/0
 description INSIDE LAN SWHC-XX
 ip address 172.16.0.2 255.255.255.0
 ip helper-address 172.16.0.20
 ip virtual-reassembly
 duplex auto
 speed auto
!
interface GigabitEthernet0/1
 description CONNECTION TO R1 Gi0/1 CROSSOVER CABLE
 ip address 172.16.1.2 255.255.255.252
 ip virtual-reassembly
 duplex auto
 speed auto
!
router ospf 1
 router-id 172.16.0.2
 log-adjacency-changes
 redistribute connected
 passive-interface default
 network 172.16.0.0 0.0.0.255 area 0
 network 172.16.1.0 0.0.0.3 area 0
!

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OSPF output

R2#sh ip os
R2#sh ip ospf
 Routing Process "ospf 1" with ID 172.16.0.2
 Start time: 00:00:42.372, Time elapsed: 03:40:02.148
 Supports only single TOS(TOS0) routes
 Supports opaque LSA
 Supports Link-local Signaling (LLS)
 Supports area transit capability
 It is an autonomous system boundary router
 Redistributing External Routes from,
    connected
 Router is not originating router-LSAs with maximum metric
 Initial SPF schedule delay 5000 msecs
 Minimum hold time between two consecutive SPFs 10000 msecs
 Maximum wait time between two consecutive SPFs 10000 msecs
 Incremental-SPF disabled
 Minimum LSA interval 5 secs
 Minimum LSA arrival 1000 msecs
 LSA group pacing timer 240 secs
 Interface flood pacing timer 33 msecs
 Retransmission pacing timer 66 msecs
 Number of external LSA 0. Checksum Sum 0x000000
 Number of opaque AS LSA 0. Checksum Sum 0x000000
 Number of DCbitless external and opaque AS LSA 0
 Number of DoNotAge external and opaque AS LSA 0
 Number of areas in this router is 1. 1 normal 0 stub 0 nssa
 Number of areas transit capable is 0
 External flood list length 0
 IETF NSF helper support enabled
 Cisco NSF helper support enabled
    Area BACKBONE(0) (Inactive)
        Number of interfaces in this area is 2
        Area has no authentication
        SPF algorithm last executed 00:22:56.056 ago
        SPF algorithm executed 3 times
        Area ranges are
        Number of LSA 1. Checksum Sum 0x007AAC
        Number of opaque link LSA 0. Checksum Sum 0x000000
        Number of DCbitless LSA 0
        Number of indication LSA 0
        Number of DoNotAge LSA 0
        Flood list length 0

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R1 config

interface GigabitEthernet0/0
 description INSIDE LAN SWITCH SWHC-1
 ip address 172.16.0.1 255.255.255.0
 ip helper-address 172.16.0.20
 ip nat inside
 ip virtual-reassembly
 duplex auto
 speed auto
!
interface GigabitEthernet0/0.20
 description Offices VLAN
 encapsulation dot1Q 20
 ip address 172.17.0.2 255.255.255.0
 ip helper-address 172.16.0.20
 ip virtual-reassembly
 standby 20 ip 172.17.0.1
 standby 20 priority 110
 standby 20 preempt
!
interface GigabitEthernet0/0.30
 description Dev Team VLAN
 encapsulation dot1Q 30
 ip address 172.18.0.2 255.255.255.0
 ip helper-address 172.16.0.20
 ip virtual-reassembly
 standby 30 ip 172.18.0.1
 standby 30 priority 110
 standby 30 preempt
!
interface GigabitEthernet0/0.40
 description Private Wireless VLAN
 encapsulation dot1Q 40
 ip address 172.19.0.2 255.255.255.0
 ip helper-address 172.16.0.20
 ip virtual-reassembly
 standby 40 ip 172.19.0.1
 standby 40 priority 110
 standby 40 preempt
!
interface GigabitEthernet0/0.50
 description Public Wireless VLAN
 encapsulation dot1Q 50
 ip address 172.20.0.2 255.255.255.0
 ip helper-address 172.16.0.20
 ip virtual-reassembly
 standby 50 ip 172.20.0.1
 standby 50 priority 110
 standby 50 preempt
!
interface GigabitEthernet0/1
 description CONNECTION TO R2 Gi0/1 CROSSOVER CABLE
 ip address 172.16.1.1 255.255.255.252
 ip virtual-reassembly
 duplex auto
 speed auto
!
interface FastEthernet0/2/0
 description TO ASA Firewall Eth0/1
 ip address 172.15.0.2 255.255.255.252
 ip access-group 1 out
 ip virtual-reassembly
 duplex auto
 speed auto
!
router ospf 1
 router-id 172.16.0.1
 log-adjacency-changes
 redistribute connected
 passive-interface default
 no passive-interface FastEthernet0/2/0
 network 172.15.0.0 0.0.0.3 area 0
 network 172.16.0.0 0.0.0.255 area 0
 network 172.16.1.0 0.0.0.3 area 0
 network 172.17.0.0 0.0.0.255 area 0
 network 172.18.0.0 0.0.0.255 area 0
 network 172.19.0.0 0.0.0.255 area 0
 network 172.20.0.0 0.0.0.255 area 0
 default-information originate
!

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ospf output

R1#sh ip ospf
R1#sh ip ospf
 Routing Process "ospf 1" with ID 172.16.0.1
 Start time: 00:00:47.364, Time elapsed: 4d05h
 Supports only single TOS(TOS0) routes
 Supports opaque LSA
 Supports Link-local Signaling (LLS)
 Supports area transit capability
 It is an autonomous system boundary router
 Redistributing External Routes from,
    connected
 Router is not originating router-LSAs with maximum metric
 Initial SPF schedule delay 5000 msecs
 Minimum hold time between two consecutive SPFs 10000 msecs
 Maximum wait time between two consecutive SPFs 10000 msecs
 Incremental-SPF disabled
 Minimum LSA interval 5 secs
 Minimum LSA arrival 1000 msecs
 LSA group pacing timer 240 secs
 Interface flood pacing timer 33 msecs
 Retransmission pacing timer 66 msecs
 Number of external LSA 1. Checksum Sum 0x004FF8
 Number of opaque AS LSA 0. Checksum Sum 0x000000
 Number of DCbitless external and opaque AS LSA 0
 Number of DoNotAge external and opaque AS LSA 0
 Number of areas in this router is 1. 1 normal 0 stub 0 nssa
 Number of areas transit capable is 0
 External flood list length 0
 IETF NSF helper support enabled
 Cisco NSF helper support enabled
    Area BACKBONE(0)
        Number of interfaces in this area is 7
        Area has no authentication
        SPF algorithm last executed 02:52:29.968 ago
        SPF algorithm executed 27 times
        Area ranges are
        Number of LSA 3. Checksum Sum 0x00E8F9
        Number of opaque link LSA 0. Checksum Sum 0x000000
        Number of DCbitless LSA 0
        Number of indication LSA 0
        Number of DoNotAge LSA 0
        Flood list length 0

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R1 show ip route

R1#sh ip rout
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is 172.15.0.1 to network 0.0.0.0

     172.15.0.0/30 is subnetted, 1 subnets
C       172.15.0.0 is directly connected, FastEthernet0/2/0
     172.17.0.0/24 is subnetted, 1 subnets
C       172.17.0.0 is directly connected, GigabitEthernet0/0.20
     172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C       172.16.0.0/24 is directly connected, GigabitEthernet0/0
C       172.16.1.0/30 is directly connected, GigabitEthernet0/1
     172.19.0.0/24 is subnetted, 1 subnets
C       172.19.0.0 is directly connected, GigabitEthernet0/0.40
     172.18.0.0/24 is subnetted, 1 subnets
C       172.18.0.0 is directly connected, GigabitEthernet0/0.30
     172.20.0.0/24 is subnetted, 1 subnets
C       172.20.0.0 is directly connected, GigabitEthernet0/0.50
O*E2 0.0.0.0/0 [110/1] via 172.15.0.1, 03:08:24, FastEthernet0/2/0

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R2 show ip route

R2#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

     172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C       172.16.0.0/24 is directly connected, GigabitEthernet0/0
C       172.16.1.0/30 is directly connected, GigabitEthernet0/1

 

 

1 ACCEPTED SOLUTION

Accepted Solutions

Since you are using passive

Since you are using passive-interface default command under router OSPF you will have to configure no passive-interface on each interface where routing adjacencies should form. 

So for R2:

router ospf 1

no passive-interface G0/1

R1:

router ospf 1

no passive-interface G0/1

Try that and see how it works.

3 REPLIES

Since you are using passive

Since you are using passive-interface default command under router OSPF you will have to configure no passive-interface on each interface where routing adjacencies should form. 

So for R2:

router ospf 1

no passive-interface G0/1

R1:

router ospf 1

no passive-interface G0/1

Try that and see how it works.

New Member

That did the trick. thanks

That did the trick. thanks for the quick response. was driving me crazy. now on to HSRP.

Thanks again

New Member

We have this issue couple of

We have this issue couple of times. 1 solution for this is to - make the ospf interface point to point with - ip ospf network point-to-point or  ip ospf network broadcast. 

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