User manual

Chapter 4 - Layer 3 Command Set - IP Networking OSPFv2 (Dynamic Routing Protocol Module)
Alvarion BreezeNET B130/B300 GigE 156 Operational User Manual
4.7.8.4 Link-to-area information filtering
Summary information about area's links which is advertised by ABR through
backbone to other area (export) can be filtered. Moreover, the information from
ABR (that came from other areas) can also be filtered (import).
Filters are configured in config-router mode:
area (A.B.C.D|<0-4294967295>) export-list NAME
area (A.B.C.D|<0-4294967295>) filter-list prefix WORD
(in|out)
area (A.B.C.D|<0-4294967295>) import-list NAME
where
 NAME - name of a filtering list (access-list),
 WORD (in|out) - name of a filtering prefix-list with direction specification (in -
import, out - export). Filters can be configured for all areas to which ABR is
connected except for the backbone area.
4.7.8.5 Links aggregation. Advertising suppression
For every area to which OSPF router is connected there is a list of address ranges
for link aggregation before sending a summary LSA to the backbone area.
Aggregated links are checked to belong to one of the address ranges. If several
links belong to one address range, ABR makes an advertisement to the backbone
(or to other areas) of only one single link with destination equal to the address
range and a metric equal to the maximal metric of all the links or equal to the
specified for this range value. It is possible to announce that some range is a
blocking one, and then advertising of the links which belong to this range will be
blocked. When advertising an aggregated backbone link to other (non-backbone)
areas, the aggregation will not be performed if the area to which backbone links
are advertised is a transit area (it has virtual links).
The list of addresses ranges for the area consists of the records that consist of the
following fields:
 Range of addresses (R)
 Flag of advertisement suppression (not-advertise)
 The metric of an aggregated link (C)