Dell BigIron RX Series, Configuration Manual

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BigIron RX Series Configuration Guide 883
53-1002253-01
Configuring IPv4 address family route parameters
28
The level-1 | level-1-2 | level-2 parameter specifies the route types to which the aggregate route
applies. The default is level-2.
Redistributing routes into IPv4 IS-IS
To redistribute routes into IPv4 IS-IS, you can perform the following configuration tasks:
•
Change the default redistribution metric (optional).
•
Configure the redistribution of a particular route type into IPv4 IS-IS (mandatory).
The
device
can redistribute routes from the following route sources into IPv4 IS-IS:
•
BGP4+.
•
RIP.
•
OSPF.
•
Static IPv4 routes.
•
IPv4 routes learned from directly connected networks.
The device can also can redistribute Level-1 IPv4 IS-IS routes into Level-2 IPv4 IS-IS routes, and
Level-2 IPv4 IS-IS routes into Level-1 IPv4 IS-IS routes.
Route redistribution from other sources into IPv4 IS-IS is disabled by default. When you enable
redistribution, the device redistributes routes only into Level 2 by default. You can specify Level 1
only, Level 2 only, or Level 1 and Level 2 when you enable redistribution.
The device automatically redistributes Level-1 routes into Level-2 routes. Thus, you do not need to
enable this type of redistribution. You also can enable redistribution of Level-2 routes into Level-1
routes.
The device attempts to use the redistributed route’s metric as the route’s IPv4 IS-IS metric. For
example, if an OSPF route has an OSPF cost of 20, the router uses 20 as the route’s IPv4 IS-IS
metric. The device uses the redistributed route’s metric as the IPv4 IS-IS metric unless the route
does not a have a valid metric. In this case, the device assigns the default metric value to the route.
For information about the default metric, refer to
“Changing the default redistribution metric” on
page 883 , which follows this section.
Changing the default redistribution metric
When IPv4 IS-IS redistributes a route from another route source (such as OSPF, BGP4+, or a static
IPv4 route) into IPv4 IS-IS, it uses the route’s metric value as its metric when the metric is not
modified by a route map or metric parameter and the default redistribution metric is set to its
default value of 0. You can change the default metric to a value from 0 – 65535.
NOTE
The Brocade implementation of IS-IS does not support the optional metric types Delay, Expense, or
Error.
For example, to change the default metric to 20, enter the following command at the IPv4 IS-IS
unicast address family configuration level.
BigIron RX(config-isis-router-ipv4u)# default-metric 20
Syntax: [no] default-metric <value>