For IS-IS to operate on the routers, IS-IS must be explicitly enabled, and at least one area address and interface must be configured. If IS-IS is enabled but no area address or interface is defined, the protocol is enabled but no routes are exchanged. When at least one area address and interface are configured, then adjacencies can be formed and routes exchanged.
Enable IS-IS (specifying the instance ID of multi-instance IS-IS is to be enabled).
Modify the level capability, if necessary, on the global level (default is level-1/2).
Define area addresses.
Configure IS-IS interfaces.
The following output displays IS-IS default values.
*A:Dut-D>config>router>isis# info detail
----------------------------------------------
no system-id
no router-id
level-capability level-1/2
no graceful-restart
no auth-keychain
no authentication-key
no authentication-type
authentication-check
csnp-authentication
no ignore-lsp-errors
no ignore-narrow-metric
lsp-lifetime 1200
lsp-mtu-size 1492
lsp-refresh-interval 600
no export-limit
no export
no import
hello-authentication
psnp-authentication
no traffic-engineering
no reference-bandwidth
no default-route-tag
no disable-ldp-sync
no advertise-passive-only
no advertise-router-capability
no hello-padding
no ldp-over-rsvp
no advertise-tunnel-link
no ignore-attached-bit
no suppress-attached-bit
no iid-tlv-enable
no poi-tlv-enable
no prefix-limit
no loopfree-alternates
no rib-priority high
ipv4-routing
no ipv6-routing
ipv4-multicast-routing native
ipv6-multicast-routing native
no multi-topology
no unicast-import-disable both
no multicast-import both
no strict-adjacency-check
igp-shortcut
shutdown
tunnel-next-hop
family ipv4
resolution disabled
resolution-filter
no rsvp
no sr-te
exit
family ipv6
resolution disabled
resolution-filter
no rsvp
no sr-te
exit
family srv4
resolution disabled
resolution-filter
no rsvp
no sr-te
exit
family srv6
resolution disabled
resolution-filter
no rsvp
no sr-te
exit
exit
exit
timers
lsp-wait 5000 lsp-initial-wait 10 lsp-second-wait 1000
sfp-wait 10000 sfp-initial-wait 1000 sfp-second-wait 1000
exit
level 1
advertise-router-capability
no hello-padding
no lsp-mtu-size
no auth-keychain
no authentication-key
no authentication-type
csnp-authentication
external-preference 160
hello-authentication
no loopfree-alternate-exclude
preference 15
psnp-authentication
no wide-metrics-only
default-metric 10
default-ipv4-multicast-metric 10
default-ipv6-unicast-metric 10
default-ipv6-multicast-metric 10
exit
level 2
advertise-router-capability
no hello-padding
no lsp-mtu-size
no auth-keychain
no authentication-key
no authentication-type
csnp-authentication
external-preference 165
hello-authentication
no loopfree-alternate-exclude
preference 18
psnp-authentication
no wide-metrics-only
default-metric 10
default-ipv4-multicast-metric 10
default-ipv6-unicast-metric 10
default-ipv6-multicast-metric 10
exit
segment-routing
shutdown
adj-sid-hold 15
no export-tunnel-table
no prefix-sid-range
no tunnel-table-pref
no tunnel-mtu
mapping-server
shutdown
exit
exit
no shutdown