Dell BigIron RX Series, Configuration Manual

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880 BigIron RX Series Configuration Guide
53-1002253-01
Configuring IPv4 address family route parameters
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Configuring IPv4 address family route parameters
This section describes how to modify the IS-IS parameters for the IS-IS IPv4 unicast address family.
To enter the IPv4 unicast address family, refer to
“Address family configuration level” on page 872.
Changing the metric style
The metric style specifies the Types, Lengths, and Values (TLVs) an IS-IS LSP can have. The TLVs
specify the types of data, the maximum length of the data, and the valid values for the data. One of
the types of data the TLVs control is a route’s default-metric. By default, the device uses the
standard IS-IS TLVs, which allows metric values from 1 – 63. The default metric style is called
“narrow”. You can increase the range of metric values supported by the device by changing the
metric style to wide. The wide metric style allows metric values from 1 – 16777215.
To change the metric style to wide, enter the following command.
BigIron RX(config-isis-router-ipv4)# metric-style wide
This command changes the metric style for both Level-1 and Level-2.
Syntax: [no] metric-style wide [level-1 | level-2]
The level-1 | level-2 parameter specifies the levels to which the change applies. If not specified, the
changes are applied to both levels.
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.