Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 264)

NOTE
This option affects all IP subnets configured on the interface. If you want to disable OSPF updates
only on some of the IP subnets on the interface, use the ospf-ignore or ospf-passive parameter
with the ip address command.
• active—When you configure an OSPFv2 interface to be active, that interface sends or receives all
the control packets and forms the adjacency. By default, the ip ospf active command is disabled.
Whenever you configure the OSPF interfaces to be passive using the default-passive-interface
command, all the OSPF interfaces stop sending and receiving control packets. To send and receive
packets over specific interfaces, you can use the ip ospf active command.
• priority—Allows you to modify the priority of an OSPF router. The priority is used when selecting the
designated router (DR) and backup designated routers (BDRs). The value can be from 0 - 255. The
default is 1. If you set the priority to 0, the device does not participate in DR and BDR election.
• retransmit-interval—The time between retransmissions of link-state advertisements (LSAs) to
adjacent routers for this interface. The value can be from 0 - 3600 seconds. The default is 5
seconds.
• transit-delay—The time it takes to transmit Link State Update packets on this interface. The value
can be from 0 - 3600 seconds. The default is 1 second.
Rules for OSPF dead interval and hello interval timers
The following rules apply regarding these timers:
• If both the hello-interval and dead-interval parameters are configured, they will each be set to the
values that you have configured.
• If the hello-interval parameter is configured, but not the dead-interval parameter, the dead-
interval parameter will be set to a value that is 4 times the value set for the hello-interval.
• If the dead-interval parameter is configured, but not the hello-interval parameter, the hello-
interval. parameter will be set to a value that is 1/4 the value set for the dead-interval. The
minimum value for the hello-interval is 1.
Change the timer for OSPF authentication changes
When you make an OSPF authentication change, the software uses the authentication-change timer
to gracefully implement the change. The software implements the change in the following ways:
• Outgoing OSPF packets - After you make the change, the software continues to use the old
authentication to send packets, during the remainder of the current authentication-change interval.
After this, the software uses the new authentication for sending packets.
• Inbound OSPF packets - The software accepts packets containing the new authentication and
continues to accept packets containing the older authentication for two authentication-change
intervals. After the second interval ends, the software accepts packets only if they contain the new
authentication key.
The default authentication-change interval is 300 seconds (5 minutes). You change the interval to a
value from 0 - 14400 seconds.
OSPF provides graceful authentication change for all the following types of authentication changes in
OSPF:
• Changing authentication methods from one of the following to another of the following:
‐ Simple text password
‐ MD5 authentication
‐ No authentication
• Configuring a new simple text password or MD5 authentication key
• Changing an existing simple text password or MD5 authentication key
Rules for OSPF dead interval and hello interval timers
264 FastIron Ethernet Switch Layer 3 Routing Configuration Guide
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