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JunosE 11.3.x IP, IPv6, and IGP Configuration Guide
set-overload-bit
362
converge, and specify an interval it waits after convergence before it clears the bit and
retransmits its LSP.
Use to configure the router to set the overload bit in the header of its nonpseudonode
LSPs.
While the overload bit is set, other routers in the domain do not include this router in
their shortest-path-first (SPF) calculations. Consequently, the other routers do not
detect any paths through this router and do not forward traffic through this router.
However, IP prefixes directly connected to this router are still reachable. When the bit
is cleared, the router is again included in SPF calculations.
You can set the overload bit for a number of reasons, including the following:
To prevent traffic through the router from disappearing into transient black holes.
To reduce routing table inaccuracies caused by router problems such as memory
shortage.
To prevent real traffic from flowing through a router to an IS-IS network, such as
might be the case for a test router connected to a production network.
Use the on-startup keyword to set the overload bit when the router reboots and to
specify a period in seconds that IS-IS waits after the reboot before it clears the overload
bit.
Use the on-startup wait-for-bgp keywords to instruct IS-IS to set the overload bit
when the router reboots and then wait until BGP has completed convergence after
the reload before IS-IS clears the overload bit. You can specify a maximum interval
that IS-IS waits for BGP notification. When that interval passes, IS-IS clears the overload
bit. If you do not specify an interval, IS-IS waits a default 600 seconds and then clears
the overload bit.
If you issue the on-startup keyword but do not issue the wait-for-bgp keyword, then
you must specify the number of seconds that IS-IS waits after a reload before clearing
the overload bit.
If you issue both the on-startup keyword and the wait-for-bgp keyword, you cannot
specify a time interval for on-startup but can optionally do so for wait-for-bgp.
By default, the overload bit is not set.
Example 1
host1(config-router)#set-overload-bit
Example 2
host1(config-router)#set-overload-bit on-startup 900
Example 3
host1(config-router)#set-overload-bit on-startup wait-for-bgp 450
Use the no version to disable the setting.
See set-overload-bit
Copyright © 2010, Juniper Networks, Inc.
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