Open Shortest Path First (OSPF)
42-31
42
the same for all routers attached to an autonomous system.
(Range: 1-65535 seconds; Default: 4 x hello interval, or 40 seconds)
•
hello-interval
seconds
- Specifies the transmit delay between sending
hello packets. Setting the hello interval to a smaller value can reduce the
delay in detecting topological changes, but will increase the routing traffic.
This value must be the same for all routers attached to an autonomous
system. (Range: 1-65535 seconds; Default: 10 seconds)
•
retransmit-interval
seconds
- Specifies the interval at which the ABR
retransmits link-state advertisements (LSA) over the virtual link. The
retransmit interval should be set to a conservative value that provides an
adequate flow of routing information, but does not produce unnecessary
protocol traffic. However, note that this value should be larger for virtual
links. (Range: 1-3600 seconds; Default: 5 seconds)
•
transmit-delay
seconds
- Estimates the time required to send a link-state
update packet over the virtual link, considering the transmission and
propagation delays. LSAs have their age incremented by this amount
before transmission. This value must be the same for all routers attached
to an autonomous system. (Range: 1-3600 seconds; Default: 1 seconds)
Command Mode
Router Configuration
Default Setting
area-id
: None
router-id
: None
hello-interval
: 10 seconds
retransmit-interval
: 5 seconds
transmit-delay
: 1 second
dead-interval
: 40 seconds
authentication-key
: None
message-digest-key
: None
Command Usage
• All areas must be connected to a backbone area (0.0.0.0) to maintain routing
connectivity throughout the autonomous system. If it not possible to physically
connect an area to the backbone, a virtual link can be used. A virtual link can
provide a logical path to the backbone for an isolated area, or can be
configured as a backup connection that can take over if the normal connection
to the backbone fails. You can specify up to 32 virtual links on this router.
• A virtual link can be configured between any two backbone routers that have
an interface to a common non-backbone area. The two routers joined by a
virtual link are treated as if they were connected by an unnumbered
point-to-point network.
• Any area disconnected from the backbone must include the transit area ID
and the router ID for a virtual link neighbor that is adjacent to the backbone.
• This router supports up 64 virtual links.
Summary of Contents for 8926EM
Page 6: ...ii ...
Page 34: ...Getting Started ...
Page 44: ...Introduction 1 10 1 ...
Page 62: ...Initial Configuration 2 18 2 ...
Page 64: ...Switch Management ...
Page 76: ...Configuring the Switch 3 12 3 ...
Page 118: ...Basic Management Tasks 4 42 4 ...
Page 164: ...User Authentication 6 28 6 ...
Page 176: ...Access Control Lists 7 12 7 ...
Page 284: ...Quality of Service 14 8 14 ...
Page 294: ...Multicast Filtering 15 10 15 ...
Page 300: ...Domain Name Service 16 6 16 ...
Page 310: ...Dynamic Host Configuration Protocol 17 10 17 ...
Page 320: ...Configuring Router Redundancy 18 10 18 ...
Page 344: ...IP Routing 19 24 19 ...
Page 356: ...Unicast Routing 20 12 20 Web Click Routing Protocol RIP Statistics Figure 20 5 RIP Statistics ...
Page 386: ...Unicast Routing 20 42 20 ...
Page 388: ...Command Line Interface ...
Page 400: ...Overview of the Command Line Interface 21 12 21 ...
Page 466: ...SNMP Commands 24 16 24 ...
Page 520: ...Access Control List Commands 26 18 26 ...
Page 546: ...Rate Limit Commands 30 2 30 ...
Page 612: ...VLAN Commands 34 24 34 ...
Page 626: ...Class of Service Commands 35 14 35 ...
Page 670: ...DHCP Commands 39 16 39 ...
Page 716: ...IP Interface Commands 41 36 41 ...
Page 768: ...IP Routing Commands 42 52 42 ...
Page 770: ...Appendices ...
Page 791: ......