D-Link DGS-3630 Series Reference Manual page 387

DGS-3630 Series Layer 3 Stackable Managed Switch Web UI Reference Guide
Parameter
Distance
Click the Apply button to accept the changes made.
Click the Find button to locate a specific entry based on the information entered.
Click the Summary Address List button to view and configure the summary address list settings.
Click the Summary Prefix List button to view and configure the summary prefix list settings.
Enter a page number and click the Go button to navigate to a specific page when multiple pages exist.
After clicking the Summary Address List button, the following page will appear.
The fields that can be configured are described below:
Parameter
Summary Address
Click the Apply button to accept the changes made.
Click the Back button to return to the previous window.
Click the Delete button to remove the specific entry.
Enter a page number and click the Go button to navigate to a specific page when multiple pages exist.
Description
Enter the distance value here. This is used to define the administrative distance of
ISIS routes. The range is from 1 to 255 for IPv4 ISIS routes and 1 to 254 for IPv6
ISIS routes.
Figure 6-222 ISIS Router Settings (Summary Address List) Window
Description
Select the level and enter the summary addresses here. This is used to create
aggregate addresses for ISIS.
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.
Levels to choose from are:
• Level-1 - Specifies that only routes redistributed into level 1 are summarized
with the configured IP address and mask value.
• Level-1-2 - Specifies that summary routes are applied when redistributing
routes into level 1 and level 2 ISIS and when level 2 ISIS advertises level 1
routes as reachable in its area.
• Level-2 - 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 ISIS will be summarized also.
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