Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 298)

270 Multi-Service IronWare Routing Configuration Guide
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Configuring IPv4 address family route parameters
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 Brocade 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.
Brocade(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 Brocade 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 Brocade 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.