01-09-2012 05:14 PM - edited 03-04-2019 02:51 PM
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
Solved! Go to Solution.
01-10-2012 01:09 PM
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
01-09-2012 05:46 PM
If you only have 3 or 4 routers, you can simply put all of them in one area (area 0).
01-10-2012 10:23 AM
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.
01-09-2012 08:08 PM
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
01-10-2012 10:24 AM
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.
01-10-2012 01:09 PM
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
01-10-2012 06:12 PM
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
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