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Setting SPF Interval for a Single-Topology IPv4 and IPv6 Configuration
Command or Action
Step 13
show isis [ instance instance-id ] neighbors [
interface-type interface-instance ] [ summary ] [ detail
] [ systemid system-id ]
Example:
RP/0/RP0/CPU0:router# show isis neighbors summary
Setting SPF Interval for a Single-Topology IPv4 and IPv6 Configuration
This task explains how to make adjustments to the SPF calculation to tune router performance. This task is
optional.
Because the SPF calculation computes routes for a particular topology, the tuning attributes are located in the
router address family configuration submode. SPF calculation computes routes for Level 1 and Level 2
separately.
When IPv4 and IPv6 address families are used in a single-topology mode, only a single SPF for the IPv4
topology exists. The IPv6 topology "borrows" the IPv4 topology; therefore, no SPF calculation is required
for IPv6. To tune the SPF calculation parameters for single-topology mode, configure the address-family
ipv4 unicast command.
The incremental SPF algorithm can be enabled separately. When enabled, the incremental shortest path first
(ISPF) is not employed immediately. Instead, the full SPF algorithm is used to "seed" the state information
required for the ISPF to run. The startup delay prevents the ISPF from running for a specified interval after
an IS-IS restart (to permit the database to stabilize). After the startup delay elapses, the ISPF is principally
responsible for performing all of the SPF calculations. The reseed interval enables a periodic running of the
full SPF to ensure that the iSFP state remains synchronized.
SUMMARY STEPS
1. configure
2. router isis instance-id
3. address-family { ipv4 | ipv6 } [ unicast ]
4. spf-interval {[ initial-wait initial | secondary-wait secondary | maximum-wait maximum ] ...}
[ level { 1 | 2 }]
5. ispf [ level { 1 | 2 }]
6. commit
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 ]
DETAILED STEPS
Command or Action
Step 1
configure
Step 2
router isis instance-id
Example:
Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
230
Purpose
(Optional) Displays information about IS-IS neighbors.
Purpose
Enables IS-IS routing for the specified routing instance,
and places the router in router configuration mode.
Implementing IS-IS
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