Help OSPF designed

[roberto.londono]

I divide my network in tree areas, I have to ISP provider to conect 15 office like farm. I want to know it is good practice or need change or redisigne it.

Thanks for help

Area 0

Corporate route

router ospf 20

router-id 1.1.1.1

log-adjacency-changes

network 10.0.1.0  0.0.0.255  area 0

network 172.16.10.0 0.255.255.255 area 10

Default-information originate always

EOT Router

router ospf 111

router-id 1.0.1.1

log-adjacency-changes

network 10.0.1.0 0.0.0.255 area 0

network 172.16.11.0 0.0.0.255 area 11

default-information originate always

Farm router

router ospf 11

router-id 1.11.1.1

log-adjacency-changes

network 10.11.1.0 0.0.0.255 area 11

network 172.16.10.0 0.0.0.255 area 10

network 172.16.11.0 0.0.0.255 area 11

[Reza Sharifi]

If you only have 3 or 4 routers, you can simply put all of them in one area (area 0).

[roberto.londono]

Reza

Thanks for help.

I tried to all my router at  area 0  however I can get work like I expecting.

I try to configure failover with different ISP at farm.

Corporte has been server by ISP call PIN address 172.16.10.0 network. The router I use is  router 3825 (1)

EOT has been server by ISP address 172.16.11.0 network. The router I use is  router 3825 (2)

EOT and Corporte are conecting by fiber address for this are 10.0.1.0 network

Farm has been server  for two ISP  and the router is 1811.

When I shutdown 172.16.10.11 I lost complet comunication with router farm.

router ospf 11

router-id 1.2.1.1

log-adjacency-changes

network 10.11.1.0 0.0.0.255 area 10

network 172.16.10.0 0.0.0.255 area 10

!

router ospf 111

log-adjacency-changes

network 10.11.1.0 0.0.0.255 area 11

network 10.100.2.0 0.0.0.255 area 11

network 172.16.11.0 0.0.0.255 area 11

Again thank for your help and time.

Roberto.

[tony.henry_2]

Roberto,

I wouldn't be sure that it will work in the advent of a failure your 172.16.10.0 network.

OSPF being heirachial wants to connect to a backbone, Area 0. Should your 172.16.10.0 network fail in this diagram the 10.11.1.0 in area 11 will be available up according to the ABR  farm router but it won't have a connection to an area 0.

Better design would be as Reza has mentioned have all of them in area 0. Or do away with your area 10 and have area 11 working on both your EOT and Corporate routers.

Tony

[roberto.londono]

Tony

Thanks for help.

I tried to all my router at  area 0  however I can get work like I expecting.

I try to configure failover with different ISP at farm.

Corporte has been server by ISP call PIN address 172.16.10.0 network. The router I use is  router 3825 (1)

EOT has been server by ISP address 172.16.11.0 network. The router I use is  router 3825 (2)

EOT and Corporte are conecting by fiber address for this are 10.0.1.0 network

Farm has been server  for two ISP  and the router is 1811.

When I shutdown 172.16.10.11 I lost complet comunication with router farm.

router ospf 11

router-id 1.2.1.1

log-adjacency-changes

network 10.11.1.0 0.0.0.255 area 10

network 172.16.10.0 0.0.0.255 area 10

!

router ospf 111

log-adjacency-changes

network 10.11.1.0 0.0.0.255 area 11

network 10.100.2.0 0.0.0.255 area 11

network 172.16.11.0 0.0.0.255 area 11

Again thank for your help and time.

Roberto.

[tony.henry_2 · Accepted solution]

Roberto,

Does it work? the last config you posted in my opinion, will result in an unstable network... the 10.11.1.0 /24 is in two areas, and OSPF won't be able to make consistent decisions about how to get to the subnet.

I would expect either of these two work without issue.

if all networks endup in area 0

Corporate route

router ospf 20

router-id 1.1.1.1

log-adjacency-changes

network 10.0.1.0  0.0.0.255  area 0

network 172.16.10.0 0.255.255.255 area 0

Default-information originate always

EOT Router

router ospf 111

router-id 1.0.1.1

log-adjacency-changes

network 10.0.1.0 0.0.0.255 area 0

network 172.16.11.0 0.0.0.255 area 0

default-information originate always

Farm router

router ospf 11

router-id 1.11.1.1

log-adjacency-changes

network 10.11.1.0 0.0.0.255 area 0

network 172.16.10.0 0.0.0.255 area 0

network 172.16.11.0 0.0.0.255 area 0

Or if everything ends up in area 11

Corporate route

router ospf 20

router-id 1.1.1.1

log-adjacency-changes

network 10.0.1.0  0.0.0.255  area 0

network 172.16.10.0 0.255.255.255 area 11

Default-information originate always

EOT Router

router ospf 111

router-id 1.0.1.1

log-adjacency-changes

network 10.0.1.0 0.0.0.255 area 0

network 172.16.11.0 0.0.0.255 area 11

default-information originate always

Farm router

router ospf 11

router-id 1.11.1.1

log-adjacency-changes

network 10.11.1.0 0.0.0.255 area 11

network 172.16.10.0 0.0.0.255 area 11

network 172.16.11.0 0.0.0.255 area 11

I hope that helps.

Tony

[roberto.londono]

EOT router

router ospf 111

router-id 1.0.1.1

log-adjacency-changes

network 10.0.1.0 0.0.0.255 area 0

network 172.16.11.0 0.0.0.255 area 10

default-information originate always

Corporate Route

router ospf 20

router-id 1.1.1.1

log-adjacency-changes

network 10.0.1.0 0.0.0.255 area 0

network 10.1.1.0 0.0.0.255 area 0

network 172.16.10.0 0.0.0.255 area 10

default-information originate always

Farm router

router ospf 15

router-id 1.15.1.1

log-adjacency-changes

network 10.15.1.0 0.0.0.255 area 10

network 172.16.10.0 0.0.0.255 area 10

network 172.16.11.0 0.0.0.255 area 10

I tested  and  work like specting. I disable 172.16.10.11 at farm.

I ping from router corporate  to farm it is ok

I ping from router EOT  to farm is is ok

I will organize other router and same farm.

Thanks very much for your help.

Roberto