The command -- summary-address 11.0.0.0 255.248.0.0
Actually summarizes the range 11.0.0.0 through 11.7.255.255
The validity of the summary assumes that the 11.0.0.0 /16
11.5.0.0
/16
11.6.0.0
/16
11.7.0.0
/16
subnets are not in use elsewhere in the network.
You could summarize with:
summary-address 11.0.0.0 255.252.0.0
and let the 11.4.0.0 /16 advertisement propagate on it's own.
This would still assume that 11.0.0.0 /16 is not in use elsewhere in the
network.
Erich Kuehn wrote:
> Im trying to summarize 3 networks into to 1 advertisement.
>
> Here is a partial network Diagram
>
> R5 ------------------ E0 11.1.1.5/16 \
> | \ Area 4 NSSA
> | /
> | /
> R6 ---S1 11.2.1.1/16 \ E0 11.1.1.6/16
> | \
> | \
> | \
> R7 -----S4 11.2.1.2/16 \
> R7 -----Lo0 11.3.1.1/16 \
> R7 -----Lo1 11.4.1.1/16 \ Eigrp 1
> /
> /
>
> Now I want to Summarize nets 11.2.0.0/16 through 11.4.0.0/16 on R5
>
> What I have done is the following
>
> R5=20
> router ospf 1
> area 4 nssa
> area 4 default-cost 20=20
> summary-address 11.0.0.0 255.248.0.0
> network 10.10.0.0 0.0.255.255 area 0
> network 11.1.0.0 0.0.255.255 area 4
>
> This seems to work, (other routers in the OSPF process see a route to =
> 11.0.0.0/13) but Im wondering about the Summary-Address 11.0.0.0 =
> 255.248.0.0 command. Am I summarizing using the correct prefix? or am I =
> summarizing to many networks?
>
> TIA
>
> Erich Kuehn
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