ospf route summarization

[clark white]

Dears

attached is the topology.

I have a 4 X Distribution switches with multiple interface Vlan for the end users , these distribution switches are connecting to 2 X Core with a layer 3 port channel.

below are the routes advertise in ospf as they are interface vlans on the distribution switches, can I use more than I summary command in the ospf process becz these are not in sequence I have left some subnets in between which are been used in Dist 5 and Dist 6 ( not shown in topology)

from DIST 1 & DIST2

network 10.229.30.0 0.0.0.255 area 100
 network 10.229.31.0 0.0.0.255 area 100
 network 10.229.32.0 0.0.0.255 area 100
 network 10.229.33.0 0.0.0.255 area 100
 network 10.229.34.0 0.0.0.255 area 100
 network 10.229.35.0 0.0.0.255 area 100
 network 10.229.36.0 0.0.0.255 area 100
 network 10.229.37.0 0.0.0.255 area 100
 network 10.229.38.0 0.0.0.255 area 100
 network 10.229.39.0 0.0.0.255 area 100
 network 10.229.90.0 0.0.0.255 area 100
 network 10.229.91.0 0.0.0.255 area 100
 network 10.229.92.0 0.0.0.255 area 100
 network 10.229.93.0 0.0.0.255 area 100
 network 10.229.94.0 0.0.0.255 area 100
 network 10.229.95.0 0.0.0.255 area 100
 network 10.229.96.0 0.0.0.255 area 100
 network 10.229.97.0 0.0.0.255 area 100
 network 10.229.98.0 0.0.0.255 area 100
 network 10.229.99.0 0.0.0.255 area 100
 network 10.229.100.0 0.0.0.255 area 100
 network 10.229.101.0 0.0.0.255 area 100
 network 10.229.100.0 0.0.0.255 area 100
 network 10.229.103.0 0.0.0.255 area 100
 network 10.229.104.0 0.0.0.255 area 100
 network 10.229.105.0 0.0.0.255 area 100
 network 10.229.109.0 0.0.0.255 area 100
 network 10.229.130.0 0.0.0.255 area 100
 network 10.229.131.0 0.0.0.255 area 100
 network 10.229.132.0 0.0.0.255 area 100
 network 10.229.133.0 0.0.0.255 area 100
 network 10.229.153.0 0.0.0.255 area 100

DIST3 & DIST4

 network 10.229.40.0 0.0.0.255 area 101
 network 10.229.41.0 0.0.0.255 area 101
 network 10.229.42.0 0.0.0.255 area 101
 network 10.229.43.0 0.0.0.255 area 101
 network 10.229.44.0 0.0.0.255 area 101
 network 10.229.45.0 0.0.0.255 area 101
 network 10.229.46.0 0.0.0.255 area 101
 network 10.229.47.0 0.0.0.255 area 101
 network 10.229.48.0 0.0.0.255 area 101
 network 10.229.49.0 0.0.0.255 area 101
 network 10.229.70.0 0.0.0.255 area 101
 network 10.229.71.0 0.0.0.255 area 101
 network 10.229.72.0 0.0.0.255 area 101
 network 10.229.73.0 0.0.0.255 area 101
 network 10.229.74.0 0.0.0.255 area 101
 network 10.229.75.0 0.0.0.255 area 101
 network 10.229.76.0 0.0.0.255 area 101
 network 10.229.77.0 0.0.0.255 area 101
 network 10.229.78.0 0.0.0.255 area 101
 network 10.229.79.0 0.0.0.255 area 101
 network 10.229.80.0 0.0.0.255 area 101
 network 10.229.81.0 0.0.0.255 area 101
 network 10.229.82.0 0.0.0.255 area 101
 network 10.229.83.0 0.0.0.255 area 101
 network 10.229.84.0 0.0.0.255 area 101
 network 10.229.85.0 0.0.0.255 area 101
 network 10.229.89.0 0.0.0.255 area 101
 network 10.229.120.0 0.0.0.255 area 101
 network 10.229.121.0 0.0.0.255 area 101
 network 10.229.122.0 0.0.0.255 area 101
 network 10.229.123.0 0.0.0.255 area 101
 network 10.229.152.0 0.0.0.255 area 101
 network 10.229.160.0 0.0.0.255 area 101

[Pawan Raut]

Yes you can.

[clark white]

Dears

attached is the topology with new switches and area's and also the ospf configuration

i am doing the following summarization, i applied the summarization on dist1 and dist2 the users on dist 5 and dist 6 loose the connectivity from  for some of the subnets

Can anybody confirm to me the summarization are correct according to the routes advertise in the ospf

on dist 1 and dist 2 

area 102 range 10.119.0.0 255.255.192.0

area 102 range 10.119.64.0 255.255.192.0

area 102 range 10.119.128.0 255.255.248.0

ON Dist 3 and Dist 4

area 101 range 10.119.32.0 255.255.224.0

area 101 range 10.119.64.0 255.255.224.0

area 101 range 10.119.120.0255.255.252.0

ON Dist 5 and Dist 6

area 100 range 10.119.16.0 255.255.240.0

area 100 range 10.119.0.0 255.255.128.0

area 100 range 10.119.96.0 255.255.224.0

Thanks

[Joseph W. Doherty]

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Posting

As already noted by Pawan, you can, but also keep in mind that the summaries will be advertised even if the ABR cannot reach the subnet or it doesn't have the optimal path to the subnet.

From you attachment, it's unclear what area(s) the cross links support between a pair of ABR distribution switches.  Suggest you support both area zero and the local area between the pair.