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In other words, a holddown prevents a router from receiving route updates until the network appears to be stable—until either an interface stops changing state (flapping) or a better route is learned. Holddowns are typically implemented with timers. If the router detects that a network is unreachable, the timer is started.
This timer must be set to a higher value than the invalid timer. [13] Holddown Timer The hold-down timer is started per route entry, when the hop count is changing from lower value to higher value. This allows the route to get stabilized. During this time no update can be done to that routing entry. This is not part of the RFC 1058.
whereas Juniper implementation has different definitions for hold-down ( However, the expired route is retained in the routing table for a specified period so that neighbors can be notified that the route has been dropped. This time period is set by configuring the hold-down timer.
Split-horizon routing with poison reverse [4] is a variant of split-horizon route advertising in which a router actively advertises routes as unreachable over the interface over which they were learned by setting the route metric to infinite (16 for RIP). The effect of such an announcement is to immediately remove most looping routes before ...
Consider now what happens if both the link from A to C and the link from B to C vanish at the same time (this can happen if node C has crashed). A believes that C is still reachable through B, and B believes that C is reachable through A. In a simple reachability protocol, such as EGP, the routing loop will persist forever.
The High Precision Event Timer (HPET) is a hardware timer available in modern x86-compatible personal computers. Compared to older types of timers available in the x86 architecture, HPET allows more efficient processing of highly timing-sensitive applications, such as multimedia playback and OS task switching .
YBA or yba can refer to a number of things: Young British Artists, a movement of British artists in the 1980s and 1990s; Yala language, a language spoken in Ogoja, Nigeria, by ISO 639 code; Young Buddhist Association, an association of Buddhists in the U.S. Banff Airport, an airstrip near Banff, Alberta, Canada, by IATA code
This optional but default feature is new with 2.6.18. When enabled on a computer with an APIC timer, the kernel does not use the 8253 programmable interval timer for timekeeping. [12] A VMware document notes that "software does not have a reliable way to determine its frequency. Generally, the only way to determine the local APIC timer’s ...