OSPF Configuration Example
447
dial-up mode, although the PPP protocol is encapsulated on the link layer, it is
still NBMA type. The peer must be specified manually. Use the
ospf peer
ip-address
command
.
■
If the network type is broadcast network or NBMA, at least the priority of one
interface must be over 0.
■
If an area is configured to a stub area, all routers connected with this area must
be configured to stub areas.
■
The interface type of two adjacent routers must be the same.
■
If two or more areas are configured, at least one area must be configured into
a backbone area (area 0).
■
Make sure the backbone area is connected with all areas.
■
A virtual connection cannot go through stub area.
2
Global troubleshooting: If the previous steps are correct but OSPF still cannot find
the remote route, check the following features of the configuration.
■
If two or more areas are configured for one router, at least one area must be
configured as a backbone area (the area-id of one area must be 0 or a virtual
link must be configured).
As shown in the following diagram, only one area is configured on Router A and
Router D and two areas are configured respectively for Router B (area0, area1) and
Router C (area1, area2). One area in Router B is 0, which satisfies the requirement.
However, none of the two areas in Router C is 0. In such a case, a virtual link must
be set up between Router C and Router B.
Make sure area 2 and area 0 (backbone area) are connected.
Figure 151
OSPF Area Schematic Diagram
■
The virtual link cannot go through a stub area and the backbone area (area 0)
cannot be configured as stub area. Therefore, if a virtual link is configured
between Router B and Router C, area 1 cannot be configured as a stub area,
nor can area 0. In the above diagram, only area 2 can be configured as a stub
area.
■
The router in the stub area (Router D) cannot receive an external route.
■
Make sure the backbone areas are connected.
Rout er A
Rout er B
Rout er C
Rout er D
ar ea 0
ar ea 1
ar ea 2
Summary of Contents for 3036
Page 1: ...http www 3com com 3Com Router Configuration Guide Published March 2004 Part No 10014299 ...
Page 4: ...VPN 615 RELIABILITY 665 QOS 681 DIAL UP 721 ...
Page 6: ...2 ABOUT THIS GUIDE ...
Page 7: ...I GETTING STARTED Chapter 1 3Com Router Introduction Chapter 2 3Com Router User Interface ...
Page 8: ...4 ...
Page 16: ...12 CHAPTER 1 3COM ROUTER INTRODUCTION ...
Page 34: ...30 ...
Page 60: ...56 CHAPTER 3 SYSTEM MANAGEMENT ...
Page 98: ...94 CHAPTER 6 DISPLAY AND DEBUGGING TOOLS ...
Page 110: ...106 ...
Page 114: ...110 CHAPTER 8 INTERFACE CONFIGURATION OVERVIEW ...
Page 158: ...154 CHAPTER 10 CONFIGURING WAN INTERFACE ...
Page 168: ...164 ...
Page 188: ...184 CHAPTER 13 CONFIGURING PPPOE CLIENT ...
Page 192: ...188 CHAPTER 14 CONFIGURING SLIP Router ip route static 0 0 0 0 0 0 0 0 10 110 0 1 ...
Page 248: ...244 CHAPTER 16 CONFIGURING LAPB AND X 25 ...
Page 320: ...316 ...
Page 330: ...326 CHAPTER 20 CONFIGURING IP ADDRESS ...
Page 362: ...358 CHAPTER 21 CONFIGURING IP APPLICATION ...
Page 374: ...370 CHAPTER 23 CONFIGURING IP COUNT ...
Page 406: ...402 CHAPTER 25 CONFIGURING DLSW ...
Page 408: ...404 ...
Page 452: ...448 CHAPTER 29 CONFIGURING OSPF ...
Page 482: ...478 CHAPTER 30 CONFIGURING BGP ...
Page 494: ...490 CHAPTER 31 CONFIGURING IP ROUTING POLICY ...
Page 502: ...498 ...
Page 508: ...504 CHAPTER 33 IP MULTICAST ...
Page 514: ...510 CHAPTER 34 CONFIGURING IGMP ...
Page 526: ...522 CHAPTER 36 CONFIGURING PIM SM ...
Page 528: ...524 ...
Page 532: ...528 CHAPTER 37 CONFIGURING TERMINAL ACCESS SECURITY ...
Page 550: ...546 CHAPTER 38 CONFIGURING AAA AND RADIUS PROTOCOL ...
Page 590: ...586 CHAPTER 40 CONFIGURING IPSEC ...
Page 599: ...IX VPN Chapter 42 Configuring VPN Chapter 43 Configuring L2TP Chapter 44 Configuring GRE ...
Page 600: ...596 ...
Page 638: ...634 CHAPTER 43 CONFIGURING L2TP ...
Page 649: ...X RELIABILITY Chapter 45 Configuring a Standby Center Chapter 46 Configuring VRRP ...
Page 650: ...646 ...
Page 666: ...662 ...
Page 670: ...666 CHAPTER 47 QOS OVERVIEW ...
Page 700: ...696 CHAPTER 49 CONGESTION MANAGEMENT ...
Page 706: ...702 CHAPTER 50 CONGESTION AVOIDANCE ...
Page 707: ...XII DIAL UP Chapter 51 Configuring DCC Chapter 52 Configuring Modem ...
Page 708: ...704 ...
Page 762: ...758 CHAPTER 52 CONFIGURING MODEM ...