D-Link DXS-3600 Series Cli Reference Manual page 628

DXS-3600 Series Layer 3 Managed 10Gigabit Ethernet Switch CLI Reference Guide
This command is used to create aggregate addresses for IS-IS. Use the no command to remove the
aggregation.
summary-address IPADDRESS MASK [level-1 | level-1-2 | level-2]
no summary-address IPADDRESS MASK
Parameters
IP-ADDRESS
MASK
level-1
level-1-2
level-2
Default
By default, no aggregation is configured.
Command Mode
Router Configuration Mode.
Command Default Level
Level: 12.
Usage Guideline
Multiple groups of addresses can be summarized for a given level. Routes learned from other routing
protocols can also be summarized. The metric used to advertise the summary is the smallest metric of all
the more specific routes. This command helps reduce the size of the routing table. This command also
reduces the size of the link-state packets (LSPs) and thus the link-state database (LSDB). It also helps
network stability because a summary advertisement is depending on many more specific routes. A single
route flap does not cause the summary advertisement to flap in most cases.
The drawback of summary addresses is that other routes might have less information to calculate the
most optimal routing table for all individual destinations.
Example
This example shows how to create an aggregate address.
Switch# configure terminal
Switch(config)# router isis
Switch(config-router)# summary-address 10.1.0.0 255.255.0.0
Switch(config-router)#
48-45 summary-prefix
This command is used to create aggregate prefixes for IS-IS. Use the no command to remove the
aggregation.
Enter the summary address designated for a range of addresses here.
Enter the IP subnet mask used for the summary route here.
(Optional) Specifies that only routes redistributed into level 1 are
summarized with the configured IP address and mask value.
(Optional) Specifies that summary routes are applied when
redistributing routes into level 1 and level 2 IS-IS and when level 2 IS-
IS advertises level 1 routes as reachable in its area.
(Optional) Specifies that routes learned by level 1 routing are
summarized into the level 2 backbone with the configured IP address
and mask value. Redistributed routes into evel-2 IS-IS will be
summarized also.
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