OSPF on Catalyst switches

[jacquesd]

Hi All,

For various reasons we need to migrate an EIGRP network to OSPF that is running on 3 x 3750 catalyst switches. Each switch has two layer 3 ports, which connects all three together, and one vlan to which users are connected. The existing EIGRP network works fine.

For OSPF, the links between the switches, which is in 10.254.0.0/16, which forms area 0. The vlan on each switch forms the other 3 areas.

My problem is that summary net link states from the vlans are injected into area 0, but they are never propagated into any other area. They stay in the backbone. Also, for some reason, summary ASB link states are generated, although no redistribution takes place between EIGRP and OSPF (both are running)

Any ideas?

Thanks!

Jacques

[pflunkert]

Hi,

i assume that you configure the redistribution under the routing process?

Can you post your configs.

Regards

Peter

[jacquesd]

Hi, thanks for the reply. All the configs resemble the one below. I used ip ospf network to prevent DR/BDR on the point-to-point links. There is no redistribution configured under either process. I am running both to create a smooth transition once OSPF is set up properly. I also included shw ip ospf database below the config. You can see that 10.37.0.0 and 10.39.0.0 is in area 0, but not in area 1.

Thanks again

Jacques

ip subnet-zero

ip routing

!

!

spanning-tree mode pvst

no spanning-tree optimize bpdu transmission

spanning-tree extend system-id

!

!

!

interface GigabitEthernet1/0/1

no switchport

bandwidth 100000

ip address 10.254.0.1 255.255.255.252

ip ospf network point-to-point

no mdix auto

!

interface GigabitEthernet1/0/2

no switchport

ip address 10.254.0.9 255.255.255.252

ip ospf network point-to-point

no mdix auto

!

interface Vlan1

ip address 10.1.0.164 255.255.0.0

!

router eigrp 2004

network 10.0.0.0

auto-summary

eigrp log-neighbor-changes

!

router ospf 1

log-adjacency-changes

network 10.1.0.0 0.0.255.255 area 1

network 10.254.0.0 0.0.255.255 area 0

show ip ospf database

OSPF Router with ID (10.254.0.9) (Process ID 1)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count

10.254.0.5 10.254.0.5 1546 0x80000011 0x005037 4

10.254.0.9 10.254.0.9 1562 0x8000000B 0x00FD84 4

10.254.0.10 10.254.0.10 1509 0x8000000F 0x006112 4

Summary Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

10.1.0.0 10.254.0.9 795 0x80000009 0x006CAA

10.37.0.0 10.254.0.10 1509 0x80000003 0x00C037

10.39.0.0 10.254.0.5 789 0x80000007 0x00BE38

Summary ASB Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

10.254.0.9 10.254.0.9 795 0x80000007 0x00F73A

Router Link States (Area 1)

Link ID ADV Router Age Seq# Checksum Link count

10.1.0.104 10.1.0.104 1442 0x80000110 0x00E591 1

10.254.0.9 10.254.0.9 795 0x80000008 0x00657E 1

Net Link States (Area 1)

Link ID ADV Router Age Seq# Checksum

10.1.0.104 10.1.0.104 1443 0x80000008 0x003FA7

Summary Net Link States (Area 1)

Link ID ADV Router Age Seq# Checksum

10.254.0.0 10.254.0.9 795 0x80000007 0x0076A7

10.254.0.4 10.254.0.9 1562 0x80000003 0x0060BC

10.254.0.8 10.254.0.9 795 0x80000007 0x0026EF

[Harold Ritter · Accepted solution]

Are still running EIGRP in parrallel? For the summary route to be passed from area 0 to the non-backbone area, the route needs to be installed in the RIB. If the EIGRP route is installed in the RIB, the lsa type 3 will not be passed to the non-backbone area. This is normal behavior.

Hope this helps,

[jacquesd]

Hi,

Most definately did help.Thanks!

Jacques