Operation Manual – IPv4 Routing
H3C S3610&S5510 Series Ethernet Switches
Chapter 3 OSPF Configuration
3-33
Note:
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Using the
import-route
command cannot redistribute a default external route. To
do so, you need to use the
default-route-advertise
command.
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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. Currently, the switch does not support this
command.
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By filtering redistributed routes, OSPF adds only routes, which are not filtered out,
into Type-5 LSAs or Type-7 LSAs for advertisement.
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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:
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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.
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Change the interval for SPF calculation to reduce resource consumption caused
by frequent network changes.
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Configure OSPF authentication to meet high security requirements of some
mission-critical networks.
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Configure OSPF network management functions, such as binding OSPF MIB with
a process, sending trap information and collecting log information.
3.7.1 Prerequisites
Before configuring OSPF network optimization, you have configured:
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IP addresses for interfaces;
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OSPF basic functions.
3.7.2 Configuring OSPF Packet Timers
You can configure the following timers on OSPF interfaces as needed:
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Hello timer: Interval for sending hello packets. It must be identical on OSPF
neighbors. The longer the interval, the lower convergence speed and smaller
network load.
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Poll timer: Interval for sending hello packets to the neighbor that is down on the
NBMA network.
