Brocade BigIron RX Series Configuration Guide - Manual (Page 1039)

BigIron RX Series Configuration Guide 961
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Configuring IPv4 address family route parameters
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This command changes the administrative distance for all IPv4 IS-IS routes to 100.
The <number> parameter specifies the administrative distance. You can specify a value from 1 –
255. (Routes with a distance value of 255 are not installed in the routing table.) The default for
IPv4 IS-IS is 115.
Configuring summary addresses
You can configure summary addresses to aggregate IS-IS route information. Summary addresses
can enhance performance by reducing the size of the Link State database, reducing the amount of
data the device needs to send to its neighbors, and reducing the CPU cycles used for IS-IS.
When you configure a summary address, the address applies only to Level-2 routes by default. You
can specify Level-1 only, Level-2 only, or Level-1 and Level-2 when you configure the address.
To configure a summary address, enter a command such as the following.
BigIron RX(config-isis-router-ipv4u)# summary-address 192.168.0.0 255.255.0.0
This command configures a summary address for all Level-2 IS-IS route destinations between
192.168.1.0 – 192.168.255.255.
Syntax: [no] summary-address <ip-addr> <subnet-mask> [level-1 | level-1-2 | level-2]
The <ip-addr> <subnet-mask> parameters specify the aggregate address. The mask indicates the
significant bits in the address. Ones are significant, and zeros allow any value. In the command
example above, the mask 255.255.0.0 matches on all addresses that begin with 192.168 and
contain any values for the final two octets.
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.