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OSPF ON FIBRE RING

adeelmir mir
Level 1
Level 1

‎02-17-2015 01:03 PM - edited ‎03-07-2019 10:42 PM

Hello Folks,

I will keep it short and simple , here is the scenario:

1. got the dedicated fibre ring (single , not dual) covering almost 50 km and there are 24 layer 3 switches hooked up with it.

2:  want to run OSPF on this ring to keep the things simple and easy. 

3: thinking to have DR/BDR in my network.

4: got  different VLANS's in different subnets.

 

can someone send configuration example based on ring topology please?

your quick response will be very much appreciated.

 

Thanks,

mir

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Reza Sharifi
Hall of Fame
Hall of Fame

‎02-17-2015 01:10 PM

Hi,

Are all these 24 switches core/distro switches or these are access layer switches.

If you only have 2 or 4 core switches and the rest (20) are access, than you may keep the access switches as layer-2 and run layer-3 (OSPF) on the cores

Can you provide a diagram of your network?

HTH

 

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adeelmir mir
Level 1
Level 1
In response to Reza Sharifi

‎02-17-2015 01:30 PM

Reza thanks for quick reply,

there is no segregation in core/distribution and access.

these are the only switches hooked up on the ring and these are layer 3 switches . There is a LAN behind these switches. I got 24 like these on the ring. Sorry don,t have diagram at this point but it will be like this roughly:

 

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Reza Sharifi
Hall of Fame
Hall of Fame
In response to adeelmir mir

‎02-17-2015 01:44 PM

Hi,

Thanks for clarification.

So one way to do this is to have /30 between each segment.  For example: configure a /30 subnet between switch-1 and switch-2 and another /30 between 2 and 3 and so on...

If you don't have a lot of vlans in each location, you can simply put all 24 switches in one area (area 0).  This configuration is pretty simple, as you just need to add each /30 and the SVIs for the local vlans to the OSPF. You also need a loopback interface for each switch/router.

HTH

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adeelmir mir
Level 1
Level 1
In response to Reza Sharifi

‎02-17-2015 01:54 PM

Thanks Reza, I don;t have more than 5 vlans , maximum on each site. here is what I have done . This is example of just two sites. 

Few more things which I forgot to mentione before , that I want to make one site as primary and other one as secondary , that other 20 sites could only talk in DR/BDR fashion. 

should I configure RSTP in that: look at this config and please let me know:

vlan 10
 name SCADA_MGMT
vlan 20
 name SCADA_LAN
vlan 50
 name SCADA_DMZ

!

ip subnet-zero
spanning-tree mode rapid-pvst
no spanning-tree optimize bpdu transmission
spanning-tree etherchannel guard misconfig
spanning-tree extend system-id

spanning-tree vlan 10,20,50,105
!         
vlan internal allocation policy ascending
!
interface range ------- (WILL DECIDE LATER)
shutdown

ip routing
!
vlan internal allocation policy ascending
!

!
interface GigabitEthernet0/1
 description "LINK TO "
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 105
 switchport trunk allowed vlan 10,20,50,105
 switchport mode trunk
 switchport nonegotiate
!
interface GigabitEthernet0/15
 description "LINK TO "
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 105
 switchport trunk allowed vlan 10,20,50,105
 switchport mode trunk
 switchport nonegotiate
!

interface Vlan1
 no ip address
 shutdown
!
interface Vlan10
 description "SCADA_MGMT_VLAN"
 ip address 192.168.10.10 255.255.255.0
 
!
interface Vlan20
 description "SCADA_LAN"
 ip address 10.10.10.10 255.255.255.0
 
!

INTERFACE LO0
IP ADDRESS 20.20.20.20 255.255.255.0
!
ROUTER OSPF 1
ROUTER_ID 20.20.20.20
NETWORK 20.20.0.0 0.0.255.255 AREA 0
NETWORK 192.168.10.0 0.0.0.255 AREA 0
NETWORK 10.10.10.0 0.0.0.255 AREA 0

===============================================

SITE B

vlan 10
 name SCADA_MGMT
vlan 20
 name SCADA_LAN
vlan 50
 name SCADA_DMZ

!

ip subnet-zero
spanning-tree mode rapid-pvst
no spanning-tree optimize bpdu transmission
spanning-tree etherchannel guard misconfig
spanning-tree extend system-id

spanning-tree vlan 10,20,50,105
!         
vlan internal allocation policy ascending
!
interface range ------- (WILL DECIDE LATER)
shutdown

ip routing
!
vlan internal allocation policy ascending
!

!
interface GigabitEthernet0/1
 description "LINK TO "
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 105
 switchport trunk allowed vlan 10,20,50,105
 switchport mode trunk
 switchport nonegotiate
!
interface GigabitEthernet0/15
 description "LINK TO "
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 105
 switchport trunk allowed vlan 10,20,50,105
 switchport mode trunk
 switchport nonegotiate
!

interface Vlan1
 no ip address
 shutdown
!
interface Vlan10
 description "SCADA_MGMT_VLAN"
 ip address 192.168.20.10 255.255.255.0
 
!
interface Vlan20
 description "SCADA_LAN"
 ip address 30.30.30.0 255.255.255.0
 
!

INTERFACE LO0
IP ADDRESS 40.40.40.10 255.255.255.0
!
ROUTER OSPF 1
ROUTER_ID 40.40.40.10
NETWORK 192.168.0 0.0.255.255 AREA 0
NETWORK 30.30.0.0 0.0.0.255 AREA 0
NETWORK 40.40.0.0 0.0.0.255 AREA 0

 

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Reza Sharifi
Hall of Fame
Hall of Fame
In response to adeelmir mir

‎02-17-2015 02:04 PM

Ok, lets first figure out few things:

1-How physically your access switches are connected to each local core switch?

2-what type of switches you are using for the core and what technology i.e stacking, VSS, VPC, etc.. are you using?

3-are all vlans unique to that local location or the vlans span across multiple sites?

HTH

 

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