About This Document
This document provides a cheat sheet of commonly used troubleshooting commands used in Cisco and Juniper environments. The list is incomplete. Please send us a note if you want to contribute.
Management
| Cisco IOS | Juniper JunOS | Description |
|---|---|---|
| show tech-support | request support info request support information | save /var/tmp/RSI.txt file archive compress source RSI.txt destination RSI.txt.tgz |
Gather support info for vendor’s TAC |
| show hardware | show chassis hardware | Show hardware-related info |
| show version | show system uptime | Show system’s uptime |
| show processes cpu show processes cpu sorted show processes cpu history |
show chassis routing-engine show system processes extensive show system threads |
Verify CPU Utilization |
| show processes memory show memory summary |
show system processes extensive show task memory detail |
Verify Memory Utilization |
| dir bootflash: | show system core-dumps | Check for crash files / core dumps |
| dir | file list | Show directory structure |
| show system storage | Verify available storage space | |
| show users | show system users | List connected users |
| clear line X | request system logout user ABC | Disconnect user |
| start shell | Enter Unix Shell | |
| monitor traffic interface ge-0/0/1 | Monitor traffic on the interface (will not show transit packets) | |
| monitor traffic interface ge-0/0/1 write-file test.pcap | Write control pacets into pcap file | |
| show snmp mib walk .1.3.6.1.4.1.2636.3 | Walk SNMP OID directly on a router | |
| request system software rollback | Request to the previous software version |
L3 Routing
Static, Connected Routes and Routing Table
| Cisco IOS | Juniper JunOS | Description |
|---|---|---|
| show ip route | show route | Show routing table |
| show ip cef | show route forwarding-table | Show forwarding table |
| show ip route connected | show route protocol direct | Show directly connected (attached) routes |
| show ip route static | show route protocol static | Show static routes |
| show route hidden | Show hidden routes. Invalid route, e.g. route with unreachable next-hop will be marked as hidden |
BGP
| Cisco IOS | Juniper JunOS | Description |
|---|---|---|
| show ip bgp summary | show bgp summary | Show summary view of BGP neighbors |
| show ip bgp neighbor A.A.A.A advertised | show route advertising-protocol bgp A.A.A.A | Check routes advertised towards a peer |
| show ip bgp neighbor A.A.A.A received | show route receive-protocol bgp A.A.A.A | Check routes received from a peer |
| show ip bgp | show route protocol bgp | Check BGP routes |
IS-IS
| IOS | IOS-XR | JunOS | Description |
| show clns interface | show isis interface | show isis interface | Show IS-IS enabled interfaces |
| show clns neighbors | show isis adjacency | show isis adjacency | Show protocol adjacencies |
| show clns traffic | show isis statistics | show isis statistics | IS-IS statistics |
| show isis database | show isis database | show isis database | Brief Database Information |
| show isis database verbose | show isis database verbose | show isis database extensive | Detailed Database Information |
| show ip route isis | show route isis | show route protocol isis | IS-IS learned routes |
| show isis adjacency-log
show isis error-log |
IS-IS historical information |
Hi Guys,
I just found your site and I like it, thanks.
My question is about bgp, what is the best command to use when you reset a neighbor so you do not reset the whole bgp connections .
thanks guys,
great site
Hi JC,
You can do ‘soft’ BGP set. Depending on the equipment you use, the command will be ‘clear IP bgp soft-out’ or something similar.