Customizing Routes For Is-Is - Cisco NCS 6000 Series Configuration Manual

Implementing IS-IS
Command or Action
RP/0/RP0/CPU0:router(config)# router isis isp
Step 3 address-family { ipv4 | ipv6 } [ unicast ]
Example:
RP/0/RP0/CPU0:router(config-isis)#address-family
ipv4 unicast
Step 4
spf-interval {[ initial-wait initial | secondary-wait
secondary | maximum-wait maximum ] ...} [ level { 1
| 2 }]
Example:
RP/0/RP0/CPU0:router(config-isis-af)# spf-interval
initial-wait 10 maximum-wait 30
Step 5
ispf [ level { 1 | 2 }]
Example:
RP/0/RP0/CPU0:router(config-isis-af)# ispf
Step 6 commit
Step 7 show isis [ instance instance-id ] [[ ipv4 | ipv6 | afi-all
] [ unicast | safi-all ]] spf-log [ level { 1 | 2 }] [ ispf |
fspf | prc | nhc ] [ detail | verbose ] [ last number |
first number ]
Example:
RP/0/RP0/CPU0:router# show isis instance 1 spf-log
ipv4

Customizing Routes for IS-IS

This task explains how to perform route functions that include injecting default routes into your IS-IS routing
domain and redistributing routes learned in another IS-IS instance. This task is optional.
Purpose
Specifies the IPv4or IPv6 address family, and enters router
address family configuration mode.
(Optional) Controls the minimum time between successive
SPF calculations.
(Optional) Configures incremental IS-IS ISPF to calculate
network topology.
(Optional) Displays how often and why the router has run
a full SPF calculation.
Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
• You can change the level of routing to be performed
by a particular routing instance by using the is-type
router configuration command.
• This value imposes a delay in the SPF computation
after an event trigger and enforces a minimum elapsed
time between SPF runs.
• If this value is configured too low, the router can lose
too many CPU resources when the network is unstable.
• Configuring the value too high delays changes in the
network topology that result in lost packets.
• The SPF interval does not apply to the running of the
ISPF because that algorithm runs immediately on
receiving a changed LSP.
Customizing Routes for IS-IS
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