08-26-2014 12:06 PM - edited 03-04-2019 11:37 PM
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
Solved! Go to Solution.
08-26-2014 01:03 PM
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.
08-26-2014 01:03 PM
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.
08-26-2014 01:25 PM
That did the trick. thanks for the quick response. was driving me crazy. now on to HSRP.
Thanks again
03-24-2016 08:11 AM
05-20-2024 05:36 PM
if it's inactive, that means you configured the wrong subnet
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