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BFD
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Use the default timers.
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BGP
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Use the default timers, including graceful restart default timers.
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DVMRP
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Use the default timers.
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IGMP
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Use the default timers.
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IS-IS
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Use the default timers, including graceful restart default timers.
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LDP
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Use the default timers, including graceful restart default timers,
except for the following:
- Set the hello hold time to at least 901 seconds for a
helper or a restarter configuration for a link-level adjacency or
for LDP targeted sessions.
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OSPF
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Use the default timers, including graceful restart default timers,
except for the dead interval. Set the OSPF dead interval to at least
301 seconds.
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PIM
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Set the query interval to at least 210 seconds.
ISSU generates a warning for any of the following conditions,
but you can ignore the warning without causing a higher FC outage:
- The current router is a DR.
- The current router is configured as an Auto RP mapping
agent and is chosen as the RP for any group.
- The current router is an elected or candidate BSR, or
if BSR candidate RPs are configured.
- The graceful restart timer is less than the default value,
30 seconds.
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RIP
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Use the default timers; graceful restart is not supported. For
scaled configurations, such as for 2000 RIP interfaces, use the following
values:
- Flush interval: 600 seconds
- Holddown time: 260 seconds
- Invalid interval: 260 seconds
- Update interval: 60 seconds
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RSVP-TE
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Use the default timers, including graceful restart default timers,
except for the following:
- For graceful restart, the hello timeout interval is the
product of hello misses multiplied by the hello refresh interval.
Determine which period is longer, the IC upgrade time or the forwarding
upgrade time. Configure the hello refresh and hello miss values so
that the hello timeout is greater than the longer of those two periods.
- For node hellos, the product of the refresh misses multiplied
by the hello refresh interval must be great than the FC outage time.
For an outage time of less than 30 seconds, for example, configure
the following values:
- Set the node hello refresh interval to 8000.
- Set the node hello refresh misses to 4.
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