I’ve done it for Junos, so I figured out it might be useful to have one for IOS XR as well ! I will try to keep this one up-to-date as well as the Junos one !

Interfaces

Display the interface part of the configuration show run interface

Check L1 and L2 status show interfaces <interface-name>

SFP/Transceiver/Fibre checking show controllers <interface-name>

List all interfaces with their IP show ipv4 interface brief show ipv6 interface brief

List all interfaces with their IP and VRF show ipv4 vrf all interface brief show ipv6 vrf all interface brief

LACP

Show the status of all LACP interfaces: show bundle brief

ARP and NDP

Display the ARP table (ipv4) show arp

Display the ND table (ipv6) show ipv6 neighbors

Hardware troubleshooting

Temperature, fans and power admin show environment temperature admin show environment fan admin show environment power

Serial numbers and PID show inventory

System troubleshooting

Display the configuration show running-config

Uptime and version show version

NTP show ntp status

NTP servers show ntp associations

Show DNS servers show hosts

Currently logged-in users show users

Last configuration changes with time and date show configuration commit list

Routing protocols troubleshooting

IS-IS

Show the IS-IS part of the configuration show run router isis

Show on which interfaces is IS-IS running show isis interface brief

Show on which interface IS-IS actually established an adjacency show isis adjacency

Show IS-IS route database show isis route

Show IS-IS link state database show isis database

Show IS-IS routes that are actually installed in the RIB show route isis

BGP

Display the BGP part of the configuration show run router bgp

Display a summarized version of the BGP neighbors show bgp ipv4 unicast summary show bgp ipv6 unicast summary

Display detailed information about a particular BGP neighbor show bgp neighbor <neighbor-ip>