Configuring OSPF
431
Specifying the
Retransmitting Interval
The router waits for confirmation from the neighbor to whom it has sent an LSA. If
the router does not receive the neighbor's confirmation after a specified interval,
the retransmitting interval, it resends the LSA. You can set the time interval for
re-transmitting an LSA.
Perform the following configurations in interface view.
Table 496
Specify Retransmitting Interval
By default, the retransmitting interval is 5 seconds.
The retransmitting interval
must be twice of the period when a message is
transmitted between two routers.
The interval for retransmitting an LSA between adjacent routers must not be so
small as to cause unnecessary retransmission.
Specifying the
Transmit-delay
The LSA ages in the link status database (LSDB) of the local router (1 is added per
second), but not during the process of network transmission. Therefore, it is
necessary to add the aging time before the transmission. Set and adjust this
parameter according to the actual situation in the low-speed network.
Perform the following configurations in interface view.
Table 497
Specify Transmit-delay
By default, the time for transmit-delay is 1 second.
Configuring a Stubby
Area and a Totally
Stubby Area
Usually, OSPF has 5 kinds of LSA packets, as follows:
■
Router-LSA:
Generated by each router and transmitted to the whole area,
describing link status and cost of the router.
■
Network-LSA:
Generated by the DR and transmitted to the whole area,
describing the link status of local network segment.
■
Net-Summary-LSA:
Generated by the ABR and transmitted to relevant areas,
describing routing of certain network segment of the area.
■
Asbr-Summary-LSA:
Generated by the ABR and transmitted to relevant area,
describing routing to ASBR.
■
AS-External-LSA:
Generated by the ASBR and transmitted to the whole AS
(excluding the Stub area), describing routing to AS external.
A “stub area” is the area that does not advertise the received external LSA, inside
which the scale of the routing table and the quantity of the transmitted routing
Operation
Command
Configure the interval of LSA
retransmission for the neighboring routers
ospf timer retransmit
seconds
Return to the default value of
re-transmitting interval
undo ospf timer retransmit
Operation
Command
Set the delay time of LSA tramsmission
ospf trans-delay
seconds
Return the default value of transmit-delay
undo ospf trans-delay
Summary of Contents for Router 3032
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...