Brocade BigIron RX Series Configuration Guide - Manual (Page 1037)

BigIron RX Series Configuration Guide 959
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Configuring IPv4 address family route parameters
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Changing the maximum number of load sharing paths
By default, IPv4 IS-IS can calculate and install four equal-cost paths into the IPv4 forwarding table.
You can change the number of paths IPv4 IS-IS can calculate and install in the IPv4 forwarding
table to a value from
1 – 8. If you change the number of paths to one, the device does not load share multiple route
paths learned from IPv4 IS-IS.
For example, to change the number of paths IPv4 IS-IS can calculate and install in the IPv4
forwarding table to three, enter the following command at the IPv4 IS-IS unicast address family
configuration level.
BigIron RX(config-isis-router-ipv4u)# maximum-paths 4
Syntax: [no] maximum-paths <number>
The <number> parameter specifies the number of paths IPv4 IS-IS can calculate and install in the
IPv4 forwarding table. Enter a number from 1 to 4. The value specified in <number> is limited by
the ip load-sharing value.
To return to the default number of maximum paths, enter the no form of this command.
Enabling advertisement of a default route
By default, the device does not generate or advertise a default route to its neighboring ISs. A
default route is not advertised even if the device’s IPv4 route table contains a default route. You
can enable the device to advertise a default route to all neighboring ISs using one of the following
methods. By default, the feature originates the default route at Level 2 only. However, you can apply
a route map to originate the default route to Level 1 only or at both Level 1 and Level 2.
NOTE
This feature requires the presence of a default route in the IPv4 route table.
To enable the device to advertise a default route that is originated a Level 2, enter the following
command at the IPv4 IS-IS unicast address family configuration level.
BigIron RX(config-isis-router-ipv4u)# default-information-originate
This command enables the device to advertise a default route into the IPv4 IS-IS area to which the
device is attached.
Syntax: [no] default-information-originate [route-map <name>]
The route-map <name> parameter allows you to specify the level on which to advertise the default
route. You can specify one of the following:
• Advertise to Level-1 ISs only.
• Advertise to Level-2 ISs only.
• Advertise to Level-1 and Level-2 ISs.
NOTE
The route map must be configured before you can use the route map as a parameter with the
default-information-originate command.
To use a route map to specify the router to advertise a default route to Level 1, enter commands
such as the following at the Global CONFIG level.