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QSW-3900-48-Т-AC
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Qtech QSW-3900-48-Т-AC [146/313] 6 configure route introduced by ospf other route

QTECH Software Configuration Manual

10-145

If the physical connection cannot be proved because of the restriction of network topology, create virtual

connection. Virtual connection means two ABRs set up a physical connection through interbal route area of a

non-Back Bone Area. The ends must be ABR and it can be effective when configuring at both two sides. Virtual

connection is marked by route ID of the opposite end. The internal area supported a non-Back Bone Area for the two

ends of the virtual connection is called Transit Area and its area number must be demonstrated when configuring.

Virtual connection is activated after the calculation of transmitting area route which equals to form

point-to-point link between two ends, so in this connection, it can also configure interface parameter as physical

interface, such as sending HELLO packet interval.

“Logical channel” means serval routers running OSPF between two ABRs which only transmit packet (the

destination address of protocol packet are not these routers, so packet is transmitted as general IP packet) and two

ABRs can straightly transmit router information. Here, router information means type 3 LSA generated by ABR, so

the synchronization of routers in area do not changed.

Caution : If autonomy system is divided to be one or more areas, there must be one Back Bone area to

guarantee the straightly or logically connection between other areas and Back Bone area and Back Bone area itself

must be connected.

Configure it in OSPF protocol configuration mode :

Create and configure virtual connection

area area-id virtual-link router-id [ hello-interval seconds ] [ retransmit- interval seconds ]

[ transmit-delay seconds ] [ dead-interval seconds] { [ authentication-key key ] |

[ message-digest-key keyid md5 key ] }

Cancel created virtual connection

no area area-id virtual-link router-id [ hello-interval seconds ] [ retransmit- interval seconds ]

[ transmit-delay seconds ] [ dead-interval seconds] { [ authentication-key key ] |

[ message-digest-key keyid md5 key ] }

By default, area-id and router-id has no default value；the value of hello-interval is 10 seconds；the value of

retransmit-interval is 5 seconds；the value of transmit-delay is 1 second；the value of dead-intervalis 40 seconds.

Example :

!Configure a virtual connection with the transmission area being 1.1.1.1，router-id of the opposite end being

10.11.5.2

QTECH(config-router-ospf)#area 1.1.1.1 virtual-link 10.11.5.2

10.2.16 Configure route introduced by OSPF other route

protocol

Each dynamic routing protocol can share routing information. Because of OSPF, router found by other

routing protocol always be handled as external routing information of autonomy.

OSPF uses following 4 kinds of different router which as priority order are :

 ·Inter Area Routing

 ·Area Border Routing

 ·The first category external routing

 ·The second category external routing

The description of routing in or between areais for network structurein Autonomy system. External

routingdescribes how to choose destination routing out of Autonomy system.

The first category external routing is received IGP router (such as : RIP and STATIC). This kind of router is

more credible, so the cost volume of external router and autonomy system is the same and can compare with the

router of OSPF itself, that is, the cost to external router= the cost to its ASBR +the cost of ASBR to destination

address.

The second category external routing is the received EGP router. This kind of router is less credible, so the

cost volume of ASBR to the outside of autonomy system is far more expensive than that of autonomy system to

ASBR, so the former is mainly considered, that is, the cost to the second external router = the cost of ASBR to

destination address. If the cost is the same, consider the cost of this router to corresponded ASBR.

Qtech QSW-3900-48-Т-AC [146/313] 6 configure route introduced by ospf other route

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