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Configuring IP Unicast Routing
Configuring ISO CLNS Routing
Configuring IS-IS Interface Parameters, page 879
Default IS-IS Configuration
Nonstop Forwarding Awareness
The integrated IS-IS NSF Awareness feature is supported for IPv4 in the IP services image. The feature allows customer
premises equipment (CPE) routers that are NSF-aware to help NSF-capable routers perform nonstop forwarding of
packets. The local router is not necessarily performing NSF, but its awareness of NSF allows the integrity and accuracy
of the routing database and link-state database on the neighboring NSF-capable router to be maintained during the
switchover process.
Feature Default Setting
Ignore link-state PDU (LSP) errors Enabled.
IS-IS type Conventional IS-IS: the router acts as both a Level 1 (station) and a Level
2 (area) router.
Multiarea IS-IS: the first instance of the IS-IS routing process is a Level
1-2 router. Remaining instances are Level 1 routers.
Default-information originate Disabled.
Log IS-IS adjacency state changes. Disabled.
LSP generation throttling timers Maximum interval between two consecutive occurrences: 5 seconds.
Initial LSP generation delay: 50 ms.
Hold time between the first and second LSP generation: 5000 ms.
LSP maximum lifetime (without a refresh) 1200 seconds (20 minutes) before the LSP packet is deleted.
LSP refresh interval Send LSP refreshes every 900 seconds (15 minutes).
Maximum LSP packet size 1497 bytes.
NSF
1
Awareness
1. NSF = Nonstop Forwarding
Enabled
2
. Allows Layer 3 switches to continue forwarding packets from a
neighboring NSF-capable router during hardware or software changes.
2. IS-IS NSF awareness is enabled for IPv4 on switches running the IP services image.
Partial route computation (PRC) throttling
timers
Maximum PRC wait interval: 5 seconds.
Initial PRC calculation delay after a topology change: 2000 ms.
Hold time between the first and second PRC calculation: 5000 ms.
Partition avoidance Disabled.
Password No area or domain password is defined, and authentication is disabled.
Set-overload-bit Disabled. When enabled, if no arguments are entered, the overload bit is
set immediately and remains set until you enter the no set-overload-bit
command.
Shortest path first (SPF) throttling timers Maximum interval between consecutive SFPs: 10 seconds.
Initial SFP calculation after a topology change: 5500 ms.
Holdtime between the first and second SFP calculation: 5500 ms.
Summary-address Disabled.
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