Stub Area; Virtual Link - Siemens S223 User Manual

User Manual
SURPASS hiD 6615 S223/S323 R1.5
10.2.6.7
10.2.6.8
A50010-Y3-C150-2-7619

Stub Area

Stub Area is that ABR is connected to Backbone Area. If it is assigned as Stub Area, ABR
will notify the default path to Stub Area and other routing protocol information will not
transmit to Stub Area.
To create Stub Area, use the following command.
Command
area <0-4294967295> stub [ no-
summary ]
If no-summary option adds to Stub Area, other Area OSPF routing information also can
not come to Stub Area, However, it only goes to default route from ABR router. That is To-
tally Stubby Area.
To delete a created Stub Area, use the following command.
Command
no area <0-4294967295> stub
[ no-summary ]

Virtual Link

In OSPF, all areas must be connected to a backbone area. If there is a break in backbone
continuity, or the backbone is purposefully portioned, you can establish a virtual link. The
virtual link must be configured in both routers.
OSPF network regards virtual link routers as Point-to-point router. Therefore, the Hello-
interval, Retransmit-interval, Transmit-delay must be consistent across all routers in an at-
tached network.
User can configure Authentication for security, Authentication key for password, and time
period for Hello-interval, Retransmit-interval, Transmit-delay and Dead-interval to operate
virtual link.
The following items describe 7 configurations for virtual link:
•
Authentication
This is configuration for security of routing information. message-digest uses MD5
to encode for authentication, null means not using any of authentication.
•
Authentication-key
Configures the authentication which is based on text encoding.
•
Message-digest-key
Configures the authentication which is based on md5 type.
•
Hello-interval
OSPF router sends Hello packet to notify existence of itself. Hello-interval is that
packet transmission interval.
•
Retransmit-interval
When router transmits LSA, it is waiting for approval information come from receiver.
Mode
Router Creates a Stub Area.
Mode
Router Deletes a created Stub Area.
UMN:CLI
Description
Description
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