D-Link DGS-3630 Emulator 1 - Page 722
summary-address
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DGS-3630 Layer 3 Stackable Managed Switch CLI Reference Guide Example This example shows how to configure intervals for SPF calculations. Switch# configure terminal Switch(config)# router isis Switch(config-router)# spf-interval 15 Switch(config-router)# 51-44 summary-address This command is used to create aggregate addresses for IS-IS. Use the no form of this command to remove the aggregation. summary-address IP-ADDRESS MASK [level-1 | level-1-2 | level-2] no summary-address IP-ADDRESS MASK Parameters IP-ADDRESS MASK level-1 level-1-2 level-2 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. 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 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. 717
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