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94 CHAPTER 5: IP ROUTING PROTOCOL OPERATION
The “logic channel” means that the multiple routers running OSPF between two
ABRs only take the role of packet forwarding (the destination addresses of the
protocol packets are not these routers, so these packets are transparent to them
and the routers forward them as common IP packets). The routing information is
directly transmitted between the two ABRs. The routing information refers to the
type-3 LSAs generated by the ABRs, for which the synchronization mode of the
routers in the area is not changed.
Perform the following configuration in OSPF area view.
The area-id and router-id variables have no default value.
By default, the hello timer is 10 seconds, retransmit is 5 seconds, trans-delay is 1
second, and the dead timer is 40 seconds.
Configuring Summarization of Imported Routes by OSPF
The OSPF implementation in the Switch 8800 supports route summarization of
imported routes.
Perform the following configurations in OSPF view.
By default, summarization of imported routes is disabled.
After the summarization of imported routes is configured, if the local router is an
autonomous system border router (ASBR), this command summarizes the
imported Type-5 LSAs in the summary address range. When NSSA is configured,
this command also summarizes the imported Type-7 LSA in the summary address
range.
If the local router works as an ABR and a router in the NSSA, this command
summarizes Type-5 LSAs transformed from Type-7 LSAs. If the router is not the
router in the NSSA, the summarization is disabled.
Configuring the OSPF Area to Support Packet Authentication
All the routers in an area should use the same authentication type. All the routers
on the same segment should use the same authentication-key password. Use the
authentication-mode simple command to configure the simple authentication
Table 39 Configuring OSPF Virtual Link
Operation Command
Create and configure a virtual link vlink-peer router-id [ hello seconds |
retransmit seconds | trans-delay seconds |
dead seconds | simple password | md5 keyid
key ]*
Remove the created virtual link undo vlink-peer router-id
Table 40 Configuring Summarization of Imported Routes by OSPF
Operation Command
Configure summarization of imported routes
by OSPF
asbr-summary ip-address mask [
not-advertise | tag value ]
Remove summarization of routes imported
into OSPF
undo asbr-summary ip-address mask