Indeed you need to define a range of addresses to summarize on the ABR
>Static user IP addresses are unlikely to be contiguous so they don't get
>summarised.
But most people have one or more IP ranges from which the static IP
addresses are allocated - we allocate those per /24.
You don't only want to summarize them to cut down on the # of routes-
you want to summarize to cut down on the number of routing _changes_
>The one thing I am not 100% sure on is the following: -
>Can ABRs only summarise E1 LSAs and not E2 LSAs.
ABRs can only summarise intra-area routes from one area when announcing them
to other areas (usually the backbone area). From the Cisco docs:
Configure Route Summarization between OSPF Areas
Route summarization is the consolidation of advertised addresses. This
feature causes a single summary route to be advertised to other areas by
an ABR. In OSPF, an ABR will advertise networks in one area into another
area. If the network numbers in an area are assigned in a way such that
they are contiguous, you can configure the ABR to advertise a summary
route that covers all the individual networks within the area that fall
into the specified range.
Mike.
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