The operational command show isis neighbor system-id expects a system-id value, but there is no option available to input or specify this value. As a result, it returns an “invalid system-id” error, where as FRR has this command show isis neighbor <system-id> which incurs the results.
vyos@vyos02:~$ sh isis neighbor system-id
Possible completions:
<Enter> Execute the current command
vyos@vyos02:~$ sh isis neighbor system-id
Invalid system id system-id
vyos@vyos02:~$ show isis neighbor
Area VyOS:
System Id Interface L State Holdtime SNPA
vyos01 eth0 2 Up 27 0cbf.e75c.0000
vyos@vyos02:~$ vtysh
Hello, this is FRRouting (version 9.1.3).
Copyright 1996-2005 Kunihiro Ishiguro, et al.
vyos02# sh isis neighbor
<cr>
WORD System id
detail show detailed information
json json output
vyos02# sh isis neighbor vyos01
Area VyOS:
vyos01
Interface: eth0, Level: 2, State: Up, Expires in 27s
Adjacency flaps: 1, Last: 14m35s ago
Circuit type: L1L2, Speaks: IPv4, IPv6
SNPA: 0cbf.e75c.0000, LAN id: vyos01.02
LAN Priority: 64, is DIS, DIS flaps: 1, Last: 14m35s ago
Area Address(es):
49.0001
IPv4 Address(es):
10.100.0.2
IPv6 Address(es):
fe80::ebf:e7ff:fe5c:0