IP Routing Commands
42-22
42
System Boundary Router (ASBR). However, an ASBR does not, by default,
generate a default route into the routing domain.
- If you use the
always
keyword, the router will advertise itself as a default
external route into the AS, even if a default external route does not actually
exist. (To define a default route, use the
ip route
command.)
- If you do
not
use the
always
keyword, the router can only advertise a
default external route into the AS if the
redistribute
command is used to
import external routes via RIP or static routing, and such a route is known.
• Type 1 route advertisements add the internal cost to the external route metric.
Type 2 routes do not add the internal cost metric. When comparing Type 2
routes, the internal cost is only used as a tie-breaker if several Type 2 routes
have the same cost.
Example
This example assigns a metric of 20 to the default external route advertised into an
autonomous system, sending it as a Type 2 external metric.
Related Commands
ip route (42-2)
redistribute (42-25)
timers spf
This command configures the hold time between making two consecutive shortest
path first (SPF) calculations. Use the
no
form to restore the default value.
Syntax
timers spf
spf-holdtime
no timers spf
spf-holdtime
- Minimum time between two consecutive SPF calculations.
(Range: 0-65535 seconds)
Command Mode
Router Configuration
Default Setting
10 seconds
Command Usage
• Setting the SPF holdtime to 0 means that there is no delay between
consecutive calculations.
• Using a low value allows the router to switch to a new path faster, but uses
more CPU processing time.
Console(config-router)#default-information originate metric 20
metric-type 2
Console(config-router)#
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: ......