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4) ODC112012 OSPF Special Areas ISSUE1.00.ppt

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HUAWEI TECHNOLOGIES CO., LTD. All rights reserved www.huawei.com OSPF Special Areas
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 2 In this course, OSPF special areas are introduced. Special areas such as Stub Area £¬ Totally Stub Area, NSSA etc. are covered in this course.
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 3 Upon completion of this course, you will be able to: ?Understand the concept and configuration of Stub Area ?Understand the concept and configuration of Totally Stub Area ?Understand the concept and configuration of NSSA Area
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 4 Stub Area Area 0 Area 1 Area 2 Connected to another AS by BGP RTA RTB A default route is flooded by Network- Summary-LSA, AS-external-LSA is not flooded Flood AS-external-LSA Flood AS-external-LSA Stub Area
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 5 Network-Summary-LSA in Stub Area RTA RTB 10.1.1.0/30 .1 .2 10.2.1.0/30 .1 .2 RTC Area 0 Area 1 RTD 10.3.1.0/30 .1 .2 Loopback0 10.4.1.1/24 Stub Area The static route destined for 10.4.1.0/24 is configured on RTC
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 6 [RTA]display ospf lsdb OSPF Process 1 with Router ID 1.1.1.1 Link State Database Area: 0.0.0.1 Type LinkState ID AdvRouter Age Len Sequence Metric Router 2.2.2.2 2.2.2.2 165 36 80000004 1 Router 1.1.1.1 1.1.1.1 165 36 80000003 1 Network 10.1.1.2 2.2.2.2 166 32 80000001 0 Sum-Net 0.0.0.0 2.2.2.2 228 28 80000001 1 Sum-Net 10.2.1.0 2.2.2.2 228 28 80000001 1 Network-Summary-LSA in Stub Area RTB only advertises a default route instead of AS-external-LSA Inter-area routing information is still advertised into Stub Area
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 7 Totally Stub Area Only one default route is advertised Neither inter-area routing information nor AS-external-LSA is advertised [RTA]display ospf lsdb OSPF Process 1 with Router ID 1.1.1.1 Link State Database Area: 0.0.0.1 Type LinkState ID AdvRouter Age Len Sequence Metric Router 2.2.2.2 2.2.2.2 10 36 80000008 1 Router 1.1.1.1 1.1.1.1 10 36 80000008 1 Network 10.1.1.1 1.1.1.1 14 32 80000001 0 Sum-Net 0.0.0.0 2.2.2.2 550 28 80000001 1
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 8 Not So Stubby Area (NSSA) RTA RTB 10.1.1.0/24 .1 .2 10.2.1.0/24 .1 .2 RTC Area 1 NSSA Area 0 RTD 10.3.1.0/24 .1 .2 Loopback0 10.4.1.1/24 Configure the static route destined for 10.4.1.0/24 Flood type 7 LSA Transform type 7 LSA into type 5 LSA Flood type 5 LSA
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 9 [RTC]display ospf lsdb nssa OSPF Process 1 with Router ID 3.3.3.3 Area: 0.0.0.1 Link State Database Type : NSSA Ls id : 10.4.1.0 Adv rtr : 3.3.3.3 Ls age : 48 Len : 36 Options : NP seq# : 8000000d chksum : 0xeea6 Net mask : 255.255.255.0 TOS 0 Metric: 1 E type : 2 Forwarding Address : 3.3.3.3 Tag : 1 NSSA-LSA LSA header£¬LS ID is destination network address Forwarding Address is the IP address of Stub interface
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 10 [RTB]display ospf lsdb ase self-originate OSPF Process 1 with Router ID 2.2.2.2 Link State Database Type : External Ls id : 10.4.1.0 Adv rtr : 2.2.2.2 Ls age : 580 Len : 36 Options : E seq# : 8000000b chksum : 0x871c Net mask : 255.255.255.0 TOS 0 Metric: 1 E type : 2 Forwarding Address : 3.3.3.3 Tag : 1 Transforming NSSA-LSA to AS-External-LSA Modify Advertising Router as the Router ID of itself Copy the Forwarding Address of original NSSA-LSA
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 11 [RTB]display ospf lsdb nssa self-originate OSPF Process 1 with Router ID 2.2.2.2 Area: 0.0.0.0 Link State Database Area: 0.0.0.1 Link State Database Type : NSSA Ls id : 0.0.0.0 Adv rtr : 2.2.2.2 Ls age : 1231 Len : 36 Options : None seq# : 80000001 chksum : 0x6654 Net mask : 0.0.0.0 TOS 0 Metric: 1 E type : 2 Forwarding Address : 2.2.2.2 Tag : 1 Using NSSA-LSA to Advertise Default Route
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 12 Configuring Stub Area£­Topology RTA RTB RTC E0 E0 S1 S1 Loopback0 1.1.1.1/32 10.1.1.1/30 .2 10.2.1.1/30 .2 Area 1 Area 0 Stub Area ASBR
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 13 Configuring Stub Area £­Configuration of RTA and RTB [RTA]router id 1.1.1.1 [RTA]ospf [RTA-ospf-1]area 1 [RTA-ospf-1-area-0.0.0.1]network 1.1.1.1 0.0.0.0 [RTA-ospf-1-area-0.0.0.1]network 10.1.1.0 0.0.0.3 [RTA-ospf-1-area-0.0.0.1]stub [RTA-ospf-1-area-0.0.0.1]return <RTA> Specify Area 1 as Stub Area [RTB]router id 2.2.2.2 [RTB]ospf [RTB-ospf-1]area 1 [RTB-ospf-1-area-0.0.0.1]network 2.2.2.2 0.0.0.0 [RTB-ospf-1-area-0.0.0.1]network 10.1.1.0 0.0.0.3 [RTB-ospf-1-area-0.0.0.1]stub [RTB-ospf-1-area-0.0.0.1]quit [RTB-ospf-1]area 0 [RTB-ospf-1-area-0.0.0.0]network 10.2.1.0 0.0.0.3 [RTB-ospf-1-area-0.0.0.0]return <RTB>
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 14 Configuring Stub Area £­Configuration of RTC [RTC]router id 3.3.3.3 [RTC]ospf [RTC-ospf-1]area 0 [RTC-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0 [RTC-ospf-1-area-0.0.0.0] [RTC-ospf-1-area-0.0.0.0]network 10.2.1.0 0.0.0.3 [RTC-ospf-1-area-0.0.0.0]quit [RTC-ospf-1] [RTC-ospf-1]import-route direct [RTC-ospf-1]quit [RTC] Import direct route
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 15 Configuring Stub Area £­Checking RTA¡¯s Routing Table Only one default route instead of detailed external routes is included in routing table [RTA]display ip routing-table Routing Tables: Public Destinations : 12 Routes : 12 Destination/Mask Proto Pre Cost NextHop Interface 0.0.0.0/0 OSPF 10 2 10.1.1.2 Ethernet0 1.1.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 10.1.1.0/30 Direct 0 0 10.1.1.1 Ethernet0 10.1.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 10.2.1.0/30 OSPF 10 1563 10.1.1.2 Ethernet0 10.5.1.0/30 Direct 0 0 10.5.1.1 Serial1 10.5.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 10.5.1.2/32 Direct 0 0 10.5.1.2 Serial1 20.1.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 20.1.1.2/32 Direct 0 0 127.0.0.1 InLoopBack0 127.0.0.0/8 Direct 0 0 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 127.0.0.1 InLoopBack0
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 16 Configuring Totally Stub Area [RTB]ospf [RTB-ospf-1]area 1 [RTB-ospf-1-area-0.0.0.1]stub no-summary [RTB-ospf-1-area-0.0.0.1]quit [RTB-ospf-1]quit [RTB] No-summary indicates no advertising Summary-LSAs ( type 3 and type 4 ) into Stub Area
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 17 [RTA]display ip routing-table Routing Tables: Public Destinations : 11 Routes : 11 Destination/Mask Proto Pre Cost NextHop Interface 0.0.0.0/0 OSPF 10 2 10.1.1.2 Ethernet0 1.1.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 10.1.1.0/30 Direct 0 0 10.1.1.1 Ethernet0 10.1.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 10.5.1.0/30 Direct 0 0 10.5.1.1 Serial1 10.5.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 10.5.1.2/32 Direct 0 0 10.5.1.2 Serial1 20.1.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 20.1.1.2/32 Direct 0 0 127.0.0.1 InLoopBack0 127.0.0.0/8 Direct 0 0 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 127.0.0.1 InLoopBack0 Configuring Totally Stub Area £­Checking RTA¡¯s Routing Table Only one default route instead of detailed external routes or internal routes is included in routing table
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 18 Configuring NSSA£­Topology Area 0 Area 1 Area 2 RTA Loopback0 RTC RTD 2.2.2.2/32 Loopback0 1.1.1.1/32 RTB E0 10.1.1.0/30 E0 .2 .1 Loopback0 3.3.3.3/32 Loopback0 4.4.4.4/32 S1 10.2.1.0/30 .1 .2 S1 S0 S0 10.3.1.0/30 .1 .2 Loopback1 20.1.1.1/32 Loopback1 30.1.1.1/32 NSSA Area
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 19 Configuring NSSA £­ Configuration of RTA and RTB [RTA]router id 1.1.1.1 [RTA]ospf [RTA-ospf-1]area 1 [RTA-ospf-1-area-0.0.0.1]network 1.1.1.1 0.0.0.0 [RTA-ospf-1-area-0.0.0.1]network 10.1.1.0 0.0.0.255 [RTA-ospf-1-area-0.0.0.1]quit [RTA-ospf-1]import-route direct [RTA-ospf-1]quit [RTA] Import the route destined for 20.1.1.1/32 as external route [RTB]router id 2.2.2.2 [RTB]ospf [RTB-ospf-1]area 1 [RTB-ospf-1-area-0.0.0.1]network 2.2.2.2 0.0.0.0 [RTB-ospf-1-area-0.0.0.1]network 10.1.1.0 0.0.0.255 [RTB-ospf-1-area-0.0.0.1]quit [RTB-ospf-1]area 0 [RTB-ospf-1-area-0.0.0.0]network 10.2.1.0 0.0.0.255 [RTB-ospf-1-area-0.0.0.0]return <RTB>
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 20 Configuring NSSA £­ Configuration of RTC [RTC]router id 3.3.3.3 [RTC]ospf [RTC-ospf-1]area 0 [RTC-ospf-1-area-0.0.0.0]network 10.2.1.0 0.0.0.255 [RTC-ospf-1-area-0.0.0.0]quit [RTC-ospf-1]area 2 [RTC-ospf-1-area-0.0.0.2]network 3.3.3.3 0.0.0.0 [RTC-ospf-1-area-0.0.0.2]network 10.3.1.0 0.0.0.255 [RTC-ospf-1-area-0.0.0.2]nssa default-route-advertise no-summary [RTC-ospf-1-area-0.0.0.2]return <RTC> [RTD]router id 4.4.4.4 [RTD]ospf [RTD-ospf-1]area 2 [RTD-ospf-1-area-0.0.0.2]network 4.4.4.4 0.0.0.0 [RTD-ospf-1-area-0.0.0.2]network 10.3.1.0 0.0.0.255 [RTD-ospf-1-area-0.0.0.2]nssa [RTD-ospf-1-area-0.0.0.2]quit [RTD-ospf-1]import-route direct [RTD-ospf-1]quit [RTD]
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 21 Checking RTD¡¯s LSDB [RTD]display ospf lsdb OSPF Process 1 with Router ID 4.4.4.4 Link State Database Area: 0.0.0.2 Type LinkState ID AdvRouter Age Len Sequence Metric Router 4.4.4.4 4.4.4.4 1075 48 80000006 1 Router 3.3.3.3 3.3.3.3 1072 48 80000004 1 Sum-Net 0.0.0.0 3.3.3.3 1081 28 80000001 1 NSSA 10.3.1.1 4.4.4.4 172 36 80000002 1 NSSA 10.3.1.0 4.4.4.4 172 36 80000002 1 NSSA 30.1.1.1 4.4.4.4 176 36 80000002 1 NSSA 4.4.4.4 4.4.4.4 176 36 80000002 1 NSSA 0.0.0.0 3.3.3.3 1878 36 80000001 1 Due to using default-route-advertise and no-summary parameter at the same time,ABR of NSSA advertises type 7 default route and type 3 default route separately.
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 22 Checking RTD¡¯s Routing Table Only one default route£¬no AS external route is learned from OSPF [RTD]display ip routing-table Routing Tables: Public Destinations : 8 Routes : 8 Destination/Mask Proto Pre Cost NextHop Interface 0.0.0.0/0 OSPF 10 2 10.3.1.1 Serial0 4.4.4.4/32 Direct 0 0 127.0.0.1 InLoopBack0 10.3.1.0/30 Direct 0 0 10.3.1.2 Serial0 10.3.1.1/32 Direct 0 0 10.3.1.1 Serial0 10.3.1.2/32 Direct 0 0 127.0.0.1 InLoopBack0 30.1.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 127.0.0.0/8 Direct 0 0 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 127.0.0.1 InLoopBack0
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 23 Checking RTC¡¯s Routing Table [RTC]display ip routing-table Routing Tables: Public Destinations : 15 Routes : 15 Destination/Mask Proto Pre Cost NextHop Interface 1.1.1.1/32 O_ASE 150 1 10.2.1.1 Serial1 3.3.3.3/32 Direct 0 0 127.0.0.1 InLoopBack0 4.4.4.4/32 O_NSSA 150 1 10.3.1.2 Serial0 10.1.1.0/30 OSPF 10 65531 10.2.1.1 Serial1 10.2.1.0/30 Direct 0 0 10.2.1.2 Serial1 10.2.1.1/32 Direct 0 0 10.2.1.1 Serial1 10.2.1.2/32 Direct 0 0 127.0.0.1 InLoopBack0 10.3.1.0/30 Direct 0 0 10.3.1.1 Serial0 10.3.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 10.3.1.2/32 Direct 0 0 10.3.1.2 Serial0 10.4.1.0/24 Static 60 0 10.3.1.2 Serial0 20.1.1.1/32 O_ASE 150 1 10.2.1.1 Serial1 30.1.1.1/32 O_NSSA 150 1 10.3.1.2 Serial0 127.0.0.0/8 Direct 0 0 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 127.0.0.1 InLoopBack0 RTC learned the AS external route destined for 30.1.1.1/32 by NSSA-LSA
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 24 [RTB]display ip routing-table Routing Tables: Public Destinations : 14 Routes : 14 Destination/Mask Proto Pre Cost NextHop Interface 1.1.1.1/32 O_ASE 150 1 10.1.1.1 Ethernet0 2.2.2.2/32 Direct 0 0 127.0.0.1 InLoopBack0 4.4.4.4/32 O_ASE 150 1 10.2.1.2 Serial1 10.1.1.0/30 Direct 0 0 10.1.1.2 Ethernet0 10.1.1.2/32 Direct 0 0 127.0.0.1 InLoopBack0 10.2.1.0/30 Direct 0 0 10.2.1.1 Serial1 10.2.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 10.2.1.2/32 Direct 0 0 10.2.1.2 Serial1 10.3.1.0/30 OSPF 10 1563 10.2.1.2 Serial1 10.3.1.1/32 O_ASE 150 1 10.2.1.2 Serial1 20.1.1.1/32 O_ASE 150 1 10.1.1.1 Ethernet0 30.1.1.1/32 O_ASE 150 1 10.2.1.2 Serial1 127.0.0.0/8 Direct 0 0 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 127.0.0.1 InLoopBack0 Checking RTB¡¯s Routing Table All AS external routes are learned by AS-external-LSA
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 25 Summary ? What¡¯s the difference between Stub Area and Totally Stub Area£¿ ? What¡¯s the difference between Stub Area and NSSA Area£¿
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  • 1. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved www.huawei.com OSPF Special Areas
  • 2. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 2 In this course, OSPF special areas are introduced. Special areas such as Stub Area £¬ Totally Stub Area, NSSA etc. are covered in this course.
  • 3. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 3 Upon completion of this course, you will be able to: ?Understand the concept and configuration of Stub Area ?Understand the concept and configuration of Totally Stub Area ?Understand the concept and configuration of NSSA Area
  • 4. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 4 Stub Area Area 0 Area 1 Area 2 Connected to another AS by BGP RTA RTB A default route is flooded by Network- Summary-LSA, AS-external-LSA is not flooded Flood AS-external-LSA Flood AS-external-LSA Stub Area
  • 5. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 5 Network-Summary-LSA in Stub Area RTA RTB 10.1.1.0/30 .1 .2 10.2.1.0/30 .1 .2 RTC Area 0 Area 1 RTD 10.3.1.0/30 .1 .2 Loopback0 10.4.1.1/24 Stub Area The static route destined for 10.4.1.0/24 is configured on RTC
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  • 7. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 7 Totally Stub Area Only one default route is advertised Neither inter-area routing information nor AS-external-LSA is advertised [RTA]display ospf lsdb OSPF Process 1 with Router ID 1.1.1.1 Link State Database Area: 0.0.0.1 Type LinkState ID AdvRouter Age Len Sequence Metric Router 2.2.2.2 2.2.2.2 10 36 80000008 1 Router 1.1.1.1 1.1.1.1 10 36 80000008 1 Network 10.1.1.1 1.1.1.1 14 32 80000001 0 Sum-Net 0.0.0.0 2.2.2.2 550 28 80000001 1
  • 8. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 8 Not So Stubby Area (NSSA) RTA RTB 10.1.1.0/24 .1 .2 10.2.1.0/24 .1 .2 RTC Area 1 NSSA Area 0 RTD 10.3.1.0/24 .1 .2 Loopback0 10.4.1.1/24 Configure the static route destined for 10.4.1.0/24 Flood type 7 LSA Transform type 7 LSA into type 5 LSA Flood type 5 LSA
  • 9. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 9 [RTC]display ospf lsdb nssa OSPF Process 1 with Router ID 3.3.3.3 Area: 0.0.0.1 Link State Database Type : NSSA Ls id : 10.4.1.0 Adv rtr : 3.3.3.3 Ls age : 48 Len : 36 Options : NP seq# : 8000000d chksum : 0xeea6 Net mask : 255.255.255.0 TOS 0 Metric: 1 E type : 2 Forwarding Address : 3.3.3.3 Tag : 1 NSSA-LSA LSA header£¬LS ID is destination network address Forwarding Address is the IP address of Stub interface
  • 10. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 10 [RTB]display ospf lsdb ase self-originate OSPF Process 1 with Router ID 2.2.2.2 Link State Database Type : External Ls id : 10.4.1.0 Adv rtr : 2.2.2.2 Ls age : 580 Len : 36 Options : E seq# : 8000000b chksum : 0x871c Net mask : 255.255.255.0 TOS 0 Metric: 1 E type : 2 Forwarding Address : 3.3.3.3 Tag : 1 Transforming NSSA-LSA to AS-External-LSA Modify Advertising Router as the Router ID of itself Copy the Forwarding Address of original NSSA-LSA
  • 11. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 11 [RTB]display ospf lsdb nssa self-originate OSPF Process 1 with Router ID 2.2.2.2 Area: 0.0.0.0 Link State Database Area: 0.0.0.1 Link State Database Type : NSSA Ls id : 0.0.0.0 Adv rtr : 2.2.2.2 Ls age : 1231 Len : 36 Options : None seq# : 80000001 chksum : 0x6654 Net mask : 0.0.0.0 TOS 0 Metric: 1 E type : 2 Forwarding Address : 2.2.2.2 Tag : 1 Using NSSA-LSA to Advertise Default Route
  • 12. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 12 Configuring Stub Area£­Topology RTA RTB RTC E0 E0 S1 S1 Loopback0 1.1.1.1/32 10.1.1.1/30 .2 10.2.1.1/30 .2 Area 1 Area 0 Stub Area ASBR
  • 13. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 13 Configuring Stub Area £­Configuration of RTA and RTB [RTA]router id 1.1.1.1 [RTA]ospf [RTA-ospf-1]area 1 [RTA-ospf-1-area-0.0.0.1]network 1.1.1.1 0.0.0.0 [RTA-ospf-1-area-0.0.0.1]network 10.1.1.0 0.0.0.3 [RTA-ospf-1-area-0.0.0.1]stub [RTA-ospf-1-area-0.0.0.1]return <RTA> Specify Area 1 as Stub Area [RTB]router id 2.2.2.2 [RTB]ospf [RTB-ospf-1]area 1 [RTB-ospf-1-area-0.0.0.1]network 2.2.2.2 0.0.0.0 [RTB-ospf-1-area-0.0.0.1]network 10.1.1.0 0.0.0.3 [RTB-ospf-1-area-0.0.0.1]stub [RTB-ospf-1-area-0.0.0.1]quit [RTB-ospf-1]area 0 [RTB-ospf-1-area-0.0.0.0]network 10.2.1.0 0.0.0.3 [RTB-ospf-1-area-0.0.0.0]return <RTB>
  • 14. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 14 Configuring Stub Area £­Configuration of RTC [RTC]router id 3.3.3.3 [RTC]ospf [RTC-ospf-1]area 0 [RTC-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0 [RTC-ospf-1-area-0.0.0.0] [RTC-ospf-1-area-0.0.0.0]network 10.2.1.0 0.0.0.3 [RTC-ospf-1-area-0.0.0.0]quit [RTC-ospf-1] [RTC-ospf-1]import-route direct [RTC-ospf-1]quit [RTC] Import direct route
  • 15. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 15 Configuring Stub Area £­Checking RTA¡¯s Routing Table Only one default route instead of detailed external routes is included in routing table [RTA]display ip routing-table Routing Tables: Public Destinations : 12 Routes : 12 Destination/Mask Proto Pre Cost NextHop Interface 0.0.0.0/0 OSPF 10 2 10.1.1.2 Ethernet0 1.1.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 10.1.1.0/30 Direct 0 0 10.1.1.1 Ethernet0 10.1.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 10.2.1.0/30 OSPF 10 1563 10.1.1.2 Ethernet0 10.5.1.0/30 Direct 0 0 10.5.1.1 Serial1 10.5.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 10.5.1.2/32 Direct 0 0 10.5.1.2 Serial1 20.1.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 20.1.1.2/32 Direct 0 0 127.0.0.1 InLoopBack0 127.0.0.0/8 Direct 0 0 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 127.0.0.1 InLoopBack0
  • 16. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 16 Configuring Totally Stub Area [RTB]ospf [RTB-ospf-1]area 1 [RTB-ospf-1-area-0.0.0.1]stub no-summary [RTB-ospf-1-area-0.0.0.1]quit [RTB-ospf-1]quit [RTB] No-summary indicates no advertising Summary-LSAs ( type 3 and type 4 ) into Stub Area
  • 17. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 17 [RTA]display ip routing-table Routing Tables: Public Destinations : 11 Routes : 11 Destination/Mask Proto Pre Cost NextHop Interface 0.0.0.0/0 OSPF 10 2 10.1.1.2 Ethernet0 1.1.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 10.1.1.0/30 Direct 0 0 10.1.1.1 Ethernet0 10.1.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 10.5.1.0/30 Direct 0 0 10.5.1.1 Serial1 10.5.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 10.5.1.2/32 Direct 0 0 10.5.1.2 Serial1 20.1.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 20.1.1.2/32 Direct 0 0 127.0.0.1 InLoopBack0 127.0.0.0/8 Direct 0 0 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 127.0.0.1 InLoopBack0 Configuring Totally Stub Area £­Checking RTA¡¯s Routing Table Only one default route instead of detailed external routes or internal routes is included in routing table
  • 18. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 18 Configuring NSSA£­Topology Area 0 Area 1 Area 2 RTA Loopback0 RTC RTD 2.2.2.2/32 Loopback0 1.1.1.1/32 RTB E0 10.1.1.0/30 E0 .2 .1 Loopback0 3.3.3.3/32 Loopback0 4.4.4.4/32 S1 10.2.1.0/30 .1 .2 S1 S0 S0 10.3.1.0/30 .1 .2 Loopback1 20.1.1.1/32 Loopback1 30.1.1.1/32 NSSA Area
  • 19. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 19 Configuring NSSA £­ Configuration of RTA and RTB [RTA]router id 1.1.1.1 [RTA]ospf [RTA-ospf-1]area 1 [RTA-ospf-1-area-0.0.0.1]network 1.1.1.1 0.0.0.0 [RTA-ospf-1-area-0.0.0.1]network 10.1.1.0 0.0.0.255 [RTA-ospf-1-area-0.0.0.1]quit [RTA-ospf-1]import-route direct [RTA-ospf-1]quit [RTA] Import the route destined for 20.1.1.1/32 as external route [RTB]router id 2.2.2.2 [RTB]ospf [RTB-ospf-1]area 1 [RTB-ospf-1-area-0.0.0.1]network 2.2.2.2 0.0.0.0 [RTB-ospf-1-area-0.0.0.1]network 10.1.1.0 0.0.0.255 [RTB-ospf-1-area-0.0.0.1]quit [RTB-ospf-1]area 0 [RTB-ospf-1-area-0.0.0.0]network 10.2.1.0 0.0.0.255 [RTB-ospf-1-area-0.0.0.0]return <RTB>
  • 20. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 20 Configuring NSSA £­ Configuration of RTC [RTC]router id 3.3.3.3 [RTC]ospf [RTC-ospf-1]area 0 [RTC-ospf-1-area-0.0.0.0]network 10.2.1.0 0.0.0.255 [RTC-ospf-1-area-0.0.0.0]quit [RTC-ospf-1]area 2 [RTC-ospf-1-area-0.0.0.2]network 3.3.3.3 0.0.0.0 [RTC-ospf-1-area-0.0.0.2]network 10.3.1.0 0.0.0.255 [RTC-ospf-1-area-0.0.0.2]nssa default-route-advertise no-summary [RTC-ospf-1-area-0.0.0.2]return <RTC> [RTD]router id 4.4.4.4 [RTD]ospf [RTD-ospf-1]area 2 [RTD-ospf-1-area-0.0.0.2]network 4.4.4.4 0.0.0.0 [RTD-ospf-1-area-0.0.0.2]network 10.3.1.0 0.0.0.255 [RTD-ospf-1-area-0.0.0.2]nssa [RTD-ospf-1-area-0.0.0.2]quit [RTD-ospf-1]import-route direct [RTD-ospf-1]quit [RTD]
  • 21. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 21 Checking RTD¡¯s LSDB [RTD]display ospf lsdb OSPF Process 1 with Router ID 4.4.4.4 Link State Database Area: 0.0.0.2 Type LinkState ID AdvRouter Age Len Sequence Metric Router 4.4.4.4 4.4.4.4 1075 48 80000006 1 Router 3.3.3.3 3.3.3.3 1072 48 80000004 1 Sum-Net 0.0.0.0 3.3.3.3 1081 28 80000001 1 NSSA 10.3.1.1 4.4.4.4 172 36 80000002 1 NSSA 10.3.1.0 4.4.4.4 172 36 80000002 1 NSSA 30.1.1.1 4.4.4.4 176 36 80000002 1 NSSA 4.4.4.4 4.4.4.4 176 36 80000002 1 NSSA 0.0.0.0 3.3.3.3 1878 36 80000001 1 Due to using default-route-advertise and no-summary parameter at the same time,ABR of NSSA advertises type 7 default route and type 3 default route separately.
  • 22. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 22 Checking RTD¡¯s Routing Table Only one default route£¬no AS external route is learned from OSPF [RTD]display ip routing-table Routing Tables: Public Destinations : 8 Routes : 8 Destination/Mask Proto Pre Cost NextHop Interface 0.0.0.0/0 OSPF 10 2 10.3.1.1 Serial0 4.4.4.4/32 Direct 0 0 127.0.0.1 InLoopBack0 10.3.1.0/30 Direct 0 0 10.3.1.2 Serial0 10.3.1.1/32 Direct 0 0 10.3.1.1 Serial0 10.3.1.2/32 Direct 0 0 127.0.0.1 InLoopBack0 30.1.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 127.0.0.0/8 Direct 0 0 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 127.0.0.1 InLoopBack0
  • 23. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 23 Checking RTC¡¯s Routing Table [RTC]display ip routing-table Routing Tables: Public Destinations : 15 Routes : 15 Destination/Mask Proto Pre Cost NextHop Interface 1.1.1.1/32 O_ASE 150 1 10.2.1.1 Serial1 3.3.3.3/32 Direct 0 0 127.0.0.1 InLoopBack0 4.4.4.4/32 O_NSSA 150 1 10.3.1.2 Serial0 10.1.1.0/30 OSPF 10 65531 10.2.1.1 Serial1 10.2.1.0/30 Direct 0 0 10.2.1.2 Serial1 10.2.1.1/32 Direct 0 0 10.2.1.1 Serial1 10.2.1.2/32 Direct 0 0 127.0.0.1 InLoopBack0 10.3.1.0/30 Direct 0 0 10.3.1.1 Serial0 10.3.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 10.3.1.2/32 Direct 0 0 10.3.1.2 Serial0 10.4.1.0/24 Static 60 0 10.3.1.2 Serial0 20.1.1.1/32 O_ASE 150 1 10.2.1.1 Serial1 30.1.1.1/32 O_NSSA 150 1 10.3.1.2 Serial0 127.0.0.0/8 Direct 0 0 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 127.0.0.1 InLoopBack0 RTC learned the AS external route destined for 30.1.1.1/32 by NSSA-LSA
  • 24. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 24 [RTB]display ip routing-table Routing Tables: Public Destinations : 14 Routes : 14 Destination/Mask Proto Pre Cost NextHop Interface 1.1.1.1/32 O_ASE 150 1 10.1.1.1 Ethernet0 2.2.2.2/32 Direct 0 0 127.0.0.1 InLoopBack0 4.4.4.4/32 O_ASE 150 1 10.2.1.2 Serial1 10.1.1.0/30 Direct 0 0 10.1.1.2 Ethernet0 10.1.1.2/32 Direct 0 0 127.0.0.1 InLoopBack0 10.2.1.0/30 Direct 0 0 10.2.1.1 Serial1 10.2.1.1/32 Direct 0 0 127.0.0.1 InLoopBack0 10.2.1.2/32 Direct 0 0 10.2.1.2 Serial1 10.3.1.0/30 OSPF 10 1563 10.2.1.2 Serial1 10.3.1.1/32 O_ASE 150 1 10.2.1.2 Serial1 20.1.1.1/32 O_ASE 150 1 10.1.1.1 Ethernet0 30.1.1.1/32 O_ASE 150 1 10.2.1.2 Serial1 127.0.0.0/8 Direct 0 0 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 127.0.0.1 InLoopBack0 Checking RTB¡¯s Routing Table All AS external routes are learned by AS-external-LSA
  • 25. HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 25 Summary ? What¡¯s the difference between Stub Area and Totally Stub Area£¿ ? What¡¯s the difference between Stub Area and NSSA Area£¿
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