Siemens S223, S323 user manual Stub Area, Virtual Link

User Manual	UMN:CLI
SURPASS hiD 6615 S223/S323 R1.5

10.2.6.7Stub 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	Mode	Description
area <0-4294967295> stub [no-	Router	Creates a Stub Area.
summary]

If no-summaryoption 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	Mode	Description
no area <0-4294967295> stub	Router	Deletes a created Stub Area.
[no-summary]

10.2.6.8Virtual 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-digestuses 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.

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