Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 229)

Multi-Service IronWare Routing Configuration Guide 201
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Adding additional parameters
• SPF hold time – The device waits for a specific amount of time between consecutive SPF
calculations. By default, the device waits zero seconds. You can configure the SPF hold time to
a value from 0 – 65535 seconds. If you set the SPF hold time to 0 seconds, the software does
not wait between consecutive SPF calculations.
You can set the delay and hold time to lower values to cause the device to change to alternate
paths more quickly in the event of a route failure. Note that lower values require more CPU
processing time.
You can change one or both of the timers.
To change the SPF delay and hold time, enter commands such as the following.
Brocade(config-ospf-router)# timers spf 10 20
The command in this example changes the SPF delay to 10 seconds and changes the SPF hold
time to 20 seconds.
To set the timers back to their default values, enter a command such as the following.
Brocade(config-ospf-router)# no timers spf 10 20
Syntax: [no] timers spf delay hold-time
The delay parameter specifies the SPF delay.
The hold-time parameter specifies the SPF hold time.
NOTE
OSPF incrementally updates the OSPF routing table when new Type-3 or Type-4 Summary, Type-5
External, or Type-7 External NSSA LSAs are received.
Modify redistribution metric type
The redistribution metric type is used by default for all routes imported into OSPF unless you
specify different metrics for individual routes using redistribution filters. Type 2 specifies a big
metric (three bytes). Type 1 specifies a small metric (two bytes). The default value is type 2.
To modify the default value to type 1, enter the following command.
Brocade(config-ospf-router)# metric-type type1
Syntax: [no] metric-type type1 | type2
The default is type2.
Modify administrative distance
The device can learn about networks from various protocols, including Border Gateway Protocol
version 4 (BGP4), RIP, IS-IS, and OSPF. Consequently, the routes to a network may differ depending
on the protocol from which the routes were learned. The default administrative distance for OSPF
routes is 110.
The router selects one route over another based on the source of the route information. To do so,
the router can use the administrative distances assigned to the sources. You can bias the decision
the device makes by changing the default administrative distance for OSPF routes.