IS-IS Status¶
TNSR supports several commands to display information about the IS-IS daemon configuration and its status.
See also
For more general dynamic routing status information, see Dynamic Routing Manager Status
The general form of the command to view IS-IS state information is show route
dynamic isis <options>. Output includes all VRFs by default, but may be
restricted to a single VRF by using show route dynamic isis vrf <vrf-name>
<options> instead. The list of options is the same in both cases.
Configuration Information¶
To view the IS-IS configuration:
tnsr(config)# show route dynamic isis config
frr version 10.3+tnsr-v25.06
frr defaults traditional
hostname hq.example.com
log file /var/log/frr/dynamic.log critical
log syslog warnings
service integrated-vtysh-config
!
interface CCLINK
ip router isis exco
isis hello-interval level-1 1
isis hello-interval level-2 3
exit
!
interface LAN
ip router isis exco
isis passive
exit
!
router isis exco
is-type level-1
net 49.0001.0100.0200.0001.00
exit
!
end
Status Information¶
Neighbors and Adjacencies¶
To view information about current IS-IS neighbors and adjacencies:
tnsr# show route dynamic isis neighbor
Area exco:
System Id Interface L State Holdtime SNPA
ro.example.com CCLINK 1 Up 10 90ec.7747.5e5d
Add the detail keyword to the command to display more detailed, verbose
information for all neighbors.
tnsr# show route dynamic isis neighbor detail
Area exco:
ro.example.com
Interface: CCLINK, Level: 1, State: Up, Expires in 9s
Adjacency flaps: 1, Last: 18m16s ago
Circuit type: L1, Speaks: IPv4
SNPA: 90ec.7747.5e5d, LAN id: ro.example.com.0d
LAN Priority: 64, is DIS, DIS flaps: 1, Last: 18m13s ago
Area Address(es):
49.0001
IPv4 Address(es):
10.127.0.2
Use show route dynamic isis neighbor <name> to show more detailed, verbose
information for one specific neighbor.
Routes¶
To view information about current IS-IS routes:
tnsr# show route dynamic isis route
Area exco:
IS-IS paths to level-1 routers that speak IP
Vertex Type Metric Next-Hop Interface Parent
--------------------------------------------------------------------------------------------
hq.example.com
10.2.0.0/24 IP internal 0 hq.example.com(4)
10.127.0.0/30 IP internal 0 hq.example.com(4)
ro.example.com TE-IS 10 ro.example.com CCLINK hq.example.com(4)
ro.example.com pseudo_TE-IS 20 ro.example.com CCLINK ro.example.com(4)
10.127.0.0/30 IP TE 20 ro.example.com CCLINK ro.example.com(4)
10.30.0.0/24 IP TE 20 ro.example.com CCLINK ro.example.com(4)
IS-IS L1 IPv4 routing table:
Prefix Metric Interface Nexthop Label(s)
--------------------------------------------------------
10.2.0.0/24 0 - - -
10.30.0.0/24 20 CCLINK 10.127.0.2 -
10.127.0.0/30 20 CCLINK 10.127.0.2 -
The output can be changed by using the following modifiers:
- backup:
Show backup routes.
- level-1:
Show IS-IS paths to level-1 routers.
- level-2:
Show IS-IS paths to level-2 routers.
- prefix-sid:
Show prefix-SID information
Link State Database¶
To view the IS-IS link state database:
tnsr(config)# show route dynamic isis database
Area exco:
IS-IS Level-1 link-state database:
LSP ID PduLen SeqNumber Chksum Holdtime ATT/P/OL
hq.example.com.00-00 * 114 0x00000013 0xef5f 1011 0/0/0
ro.example.com.00-00 105 0x00000002 0x41ae 1018 0/0/0
ro.example.com.0d-00 51 0x00000002 0x5cfe 1022 0/0/0
3 LSPs
Add the detail keyword to the command to display more detailed, verbose
information.
Add lsp <lsp-id> to restrict information to one specific LSP.
Interfaces¶
To view information about interfaces participating in IS-IS:
tnsr(config)# show route dynamic isis interface
Area exco:
Interface CircId State Type Level
LAN 0x0 Up lan L1
CCLINK 0x12 Up lan L1
Add the detail keyword to the command to display more detailed, verbose
information for all interfaces.
tnsr# show route dynamic isis interface detail
Area exco:
Interface: LAN, State: Up, Passive, Circuit Id: 0x0
Type: lan, Level: L1, SNPA: 0000.0000.0000
Level-1 Information:
Metric: 10
IP Prefix(es):
10.2.0.1/24
IPv6 Link-Locals:
fe80::290:bff:fe7a:8a65/64
IPv6 Prefixes:
2001:db8:f0::1/64
Interface: CCLINK, State: Up, Active, Circuit Id: 0x12
Type: lan, Level: L1, SNPA: 0090.0b7a.8a6a
Level-1 Information:
Metric: 10, Active neighbors: 1
Hello interval: 1, Holddown count: 10, Padding: yes
CNSP interval: 10, PSNP interval: 2
LAN Priority: 64, is not DIS
IP Prefix(es):
10.127.0.1/30
IPv6 Link-Locals:
fe80::290:bff:fe7a:8a6a/64
Use show route dynamic isis interface <name> to show more detailed, verbose
information for one specific interface.
Summary¶
To view a summary of the IS-IS daemon status:
tnsr# show route dynamic isis summary
vrf : default
Process Id : 2420
System Id : 0100.0200.0001
Up time : 00:34:12 ago
Number of areas : 1
Area exco:
Net: 49.0001.0100.0200.0001.00
TX counters per PDU type:
L1 IIH: 2151
L1 LSP: 4
LSP RXMT: 0
RX counters per PDU type:
L1 IIH: 2147
L1 LSP: 6
L1 CSNP: 226
Drop counters per PDU type:
Advertise high metrics: Disabled
Level-1:
LSP0 regenerated: 6
LSPs purged: 0
SPF:
minimum interval : 1
IPv4 route computation:
last run elapsed : 00:04:45 ago
last run duration : 72 usec
run count : 11
Hostname to System ID Mappings¶
To view a list of mappings the IS-IS daemon has made between system IDs and hostnames:
tnsr# show route dynamic isis hostname
vrf : default
Level System ID Dynamic Hostname
1 0100.3000.0001 ro.example.com
* 0100.0200.0001 hq.example.com
Fast Re-route¶
To view information about current IS-IS fast re-route data:
tnsr# show route dynamic isis fast-reroute
Area exco:
IS-IS L1 IPv4 Fast ReRoute summary:
Protection \ Priority Critical High Medium Low Total
-------------------------------------------------------------------------
Classic LFA 0 0 0 0 0
Remote LFA 0 0 0 0 0
Topology Independent LFA 0 0 0 0 0
ECMP 0 0 0 0 0
Unprotected 0 0 0 2 2
Protection coverage 0.00% 0.00% 0.00% 0.00% 0.00%
Add the level-1 or level-2 modifier to restrict the output to only L1 or
L2 routers.
SPF Backoff Delay¶
To view IS-IS SPF backoff delay (RFC 8405) information:
tnsr# show route dynamic isis spf-backoff-delay
vrf : default
Area exco:
Level-1:
SPF delay status: Not scheduled
Using legacy backoff algo