Install guide

2-30 Release Note
Software Version 2.7.5
C613-10454-00 REV A
Open Shortest Path First (OSPF)
When the router or switch runs OSPF, it receives routing information from
neighbouring routers and advertises routing information to neighbouring
routers. This routing information is contained in Link State Advertisements
(LSAs). OSPF also generates LSAs internally.
You can filter routing information at the processing points shown in the
following figure. The figure also indicates the type of LSA at each processing
point.
Processing points for route filtering when using OSPF
The following table describes the different types of LSA.
LSA
database
Routing
Information
Base
(RIB)
filtered by
route map
applied using
set ospf inroutemap
filtered by
route map
applied using
add ospf redistribute
static
routes
filtered by
IP route filters
direction=receive
(not recommended)
ip-route-filter-ospf1
importing
turned on with
set ospf rip
RIP routes
filtered by
IP filter
applied using
set ospf bgpfilter
BGP routes
OSPF
NBR
T1, T2, T4 routes
Includes interface routes
OSPF
summary
routes
filtered by IP route filters with direction=send
T3 routes
T5 or T7
routes
T1-T7 routes
The filtering
router or switch
LSA Name LSA describes LSA is created
Type-1 Router-LSA the state and cost of each of the
router or switch’s interfaces to the
area
by OSPF, on every router in
the area
Type-2 Network-LSA all routers attached to the network by OSPF, on the network’s
Designated Router