Configuring Ospf Network Optimization - H3C S7500E Series Operation Manual

Operation Manual – IPv4 Routing
H3C S7500E Series Ethernet Switches
Redistribute a default
route
Configure the default
parameters for
redistributed routes (cost,
route number, tag and
type)
Note:
Using the import-route command cannot redistribute a default external route. To
do so, you need to use the default-route-advertise command.
The default-route-advertise summary cost command is applicable only to VPN,
and the default route is redistributed in a Type-3 LSA. The PE router will advertise
the default route to the CE router. The switch does not support this command
currently.
By filtering redistributed routes, OSPF adds only routes, which are not filtered out,
into Type-5 LSAs or Type-7 LSAs for advertisement.
You can configure default parameters such as the cost, upper limit, tag and type for
redistributed routes. Tags are used to indicate information related to protocols. For
example, when redistributing BGP routes, OSPF uses tags to differentiate AS IDs.

3.7 Configuring OSPF Network Optimization

You can optimize your OSPF network in the following ways:
Change OSPF packet timers to adjust the OSPF network convergence speed and
network load. On low speed links, you need to consider the delay time for sending
LSAs on interfaces.
Change the interval for SPF calculation to reduce resource consumption caused
by frequent network changes.
Configure OSPF authentication to meet high security requirements of some
mission-critical networks.
To do...
default-route-advertise
[ always | cost cost | type
type | route-policy
route-policy-name ]*
default-route-advertise
summary cost cost
default { cost cost | limit
limit | tag tag | type type }
*
Use the command...
3-32
Chapter 3 OSPF Configuration
Remarks
Optional
Not redistributed by
default
Optional
By default, the default
cost is 1, default upper
limit of routes
redistributed per time is
1000, default tag is 1 and
default type of
redistributed routes is
Type-2.