Configuring Ospf To Redistribute External Routes; Ospf Network Adjustment And Optimization - 3Com 5500-EI PWR Install Manual

Configuring OSPF to Redistribute External Routes

Follow these steps to configure OSPF to redistribute external routes:
To do...
Enter system view
Enter OSPF view
Configure OSPF to
redistribute routes from
another protocol
Configure OSPF to filter
outgoing routes
Enable OSPF to import
the default route
Configure the default
parameters for
redistributed routes,
including cost, interval,
limit, tag, and type
The import-route command cannot import the default route. To import the default route, you must
use the default-route-advertise command.
The filtering of advertised routes by OSPF means that OSPF only converts the external routes
meeting the filter criteria into Type-5 or Type-7 LSAs and advertises them.
When enabling OSPF to import external routes, you can also configure the defaults of some
additional parameters, such as cost, limit, tag, and type. A route tag can be used to identify
protocol-related information.

OSPF Network Adjustment and Optimization

You can adjust and optimize an OSPF network in the following aspects:
By changing the OSPF packet timers, you can adjust the convergence speed of the OSPF network
and the network load brought by OSPF packets. On some low-speed links, you need to consider
the delay experienced when the interfaces transmit LSAs.
Use the command...
system-view
ospf [ process-id [ router-id
router-id ] ]
import-route protocol [ process-id ]
[ cost value | type value | tag value |
route-policy route-policy-name ] *
filter-policy { acl-number | ip-prefix
ip-prefix-name } export [ protocol ]
default-route-advertise [ always |
cost value | type type-value |
route-policy route-policy-name ]*
default { cost value | interval
seconds | limit routes | tag tag | type
type } *
4-21
Remarks
—
—
Required
By default, OSPF does not
import the routing information
of other protocols.
Optional
By default, OSPF does not filter
advertised routes.
Optional
By default, OSPF does not
import the default route.
Optional
These parameters respectively
default to:
Cost: 1
Interval: 1 (second)
Limit: 1000
Tag: 1
Type: 2