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OSPF and IS-IS: Choosing an IGP for Large-Scale Networks by Jeff Doyle

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8.2. Flooding Enhancements

Section 8.1.5 refers several times to network instabilities causing a flood of LSA/LSPs, but the focus is on enhancing SPF so that the router’s processor is not overwhelmed during unusually busy periods. In other words, the focus is on the router protecting itself. But as in any community, self-protection becomes less of an issue if all the members of the community behave themselves and watch out for their neighbors. In the case of link state protocols, enhancing the flooding mechanism to reduce the chance that a router will overwhelm a neighbor or an area with LSA/LSPs makes a router a better neighbor.

As with SPF enhancements, most flooding enhancements are not a part of the open protocol specifications. (IS-IS mesh ...

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