Hi ,
I need an help to configure network correcly, I divided my ospf network to areas and now I cant summarize the ip blocks with ospf area ranges. I divided one area to 4 different area due to too much router were at one area, these four diffirent area using the ranges 172.17.41.0/24 and 172.17.42.0/24 mixed. how can I summarize them on router B and decrease route table on backbone routers. I try to show with simple diagram at below, Thanks everyone to all helps.
no any help ?
HI! if you’re trying to summarize routes using OSPF, then the PPPoE server will be the ABR (area border router) or ASBR; but you’ll need to standardize your subnets, as example PPPoE 1 will have clients at only one range (a.e. 172.16.0.0/24); then you can do a redistribute connected and the add a summary network which contains all of the /32 IPs assigned to each CPE.
Hi sri2007,
thanks for your help, I can summarize pppoe_server pool on pppoe server, but I need summarize these area’s ip blocks on router B.
ohh, ok got it… so the main question here will be, does the router B have interfaces assigned to each area (I mean area 0, area 1 and area 2); or only each PowerBox has one interface at the backbone area and the other one in the default area?
The rule is that only the ABR (area border router) or the ASBR (autonomous system border router) are allowed to summarize (aggregate) networks.
yes router B have area 1,area 2 and area3 on it… and router B also at Backbone area…
Thanks
any update ?
no answer ?
Hi amt, you use an “area range” on router B to summarize the area to other areas. You can create it under Routing->OSPF->Area Ranges.
hi mducharme,
thanks for your answer… it was like as you said, I was using area range to summarize but it was one area before and I used 3 x /24 ip range at this one area, now I divided that area to 3 diffrend area and all ip’s mixed on area’s now thats why I cant use that code below;
add area=area1 range=172.17.30.0/24
because ip address 172.17.30.1/29 at area1 but 172.17.30.9/30 at area2 and 172.17.30.21/30 at area3
I divided one are to 3 different area because there were 160 device on one area and I thought that may create problem for ospf. how many device can be in one area ?
Thanks
If the public IP ranges are mixed randomly in all areas, one solution can be to tunnel the customers back to a central router (or routers) using either VPLS tunnels (preferred) or EoIP tunnels. That central router (or routers) can then have an OSPF stub area with an area range to summarize the advertisements.
Why do you have so many OSPF routers - is each AP on your network doing OSPF as well? We only do OSPF on the site head end router (where your powerbox seems to sit) instead of on each AP. Our AP’s are bridged.
no any puplic ip, puplic ip’s only on pppoe server…
Only PowerBox work ospf, AP’s are connected with /30 ip to powerbox and I add /30 ip to ospf networks on PowerBox so I can reach to the AP’s.. is this way wrong ?
and How many device can I use in one area ? if 160- 170 device not problem I can collect them again to one area.
Please explain what you mean by 160-170 “devices”. Do you mean 160-170 OSPF routers (ex. 160 powerboxes)?
160 device but ospf not working all of them, for example p2p links connected with /29 , AP’s with connected to powerbox with /30. Only power box or Rb1100 works with ospf if AP attached on it or if any p2p link
Then how many OSPF routers and how many routes?
60 ospf installed router and 100 not installed(which is AP or P2p Link)
But how many OSPF routes in the routing table? My thought is you probably do not need so many areas, especially if you only have a couple hundred routes. More areas used to be needed with older routers, but those were recommendations based on 1990’s or early 2000’s routers.
Sorry I missed that you asked for routes, Area1 60 routes, Area2 33 routes, Area3 44 Routes if i collect them in one area total routes will be 137. too much or its very low for one area ?
I also try to create black hole route and redistribute the static route on router B to make summarize but couldn’t success.
Thanks for your all help
That is fine for one area, you don’t need three. It especially doesn’t make sense to split things into different areas if you do not have the subnets arranged in such a way that you can summarize properly, which is what it seems you had done.
so, I understand that you suggest me to convert multiple area to 1 area back and do summarize with area ranges.
and I understand that there is no any summarize choice if multiple subnets used at multiple areas