Configuring Summary Addresses; Redistributing Routes Into Ipv4 Is-Is - Dell PowerConnect B-RX Configuration Manual

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Lower administrative distances are preferred over higher distances. For example, if the device
receives routes for the same network from IPv4 IS-IS and from RIP, it will prefer the IPv4 IS-IS route
by default.
To change the administrative distance for IPv4 IS-IS routes, enter the following command at the
IPv4 IS-IS unicast address family configuration level.
BigIron RX(config-isis-router-ipv4u)# distance 100
Syntax: [no] distance <number>
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:
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BigIron RX Series Configuration Guide
53-1001810-01
OSPF – 110
IPv4 IS-IS – 115
RIP – 120
IBGP – 200
Local BGP – 200
Unknown – 255 (the device will not use this route)
Change the default redistribution metric (optional).
Configure the redistribution of a particular route type into IPv4 IS-IS (mandatory).
Configuring IPv4 address family route parameters
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