Scope
Below are some useful commands that can be used to diagnose and troubleshoot Livewire problems within a Cisco switch.
Description
It is common for people to issue a "show running-config" command to determine whether a Cisco switch is programmed correctly for Livewire, but there are also several other useful commands that can show the status of IGMP querier, cpu load, spanning-tree status, and others.
These commands work on Cisco Catalyst switches, however depending on the model and version of IOS you are using, some commands could vary slightly. All commands should be entered in privileged mode (login and then type "enable")
IGMP (Multicast)
Check IGMP snooping
Diagnostic benefit:
Useful for checking multicast IP address groups and what ports subscribe to them
Command:
sh ip igmp snooping groupsExpected output format:
Vlan Group Type Version Port List
-----------------------------------------------------------------------
1 224.0.1.129 igmp v2 Gi1/0/11, Gi1/0/19
1 238.38.38.38 igmp v2 Gi1/0/19
1 239.128.0.0 igmp v2 Gi1/0/7
1 239.128.0.251 igmp v2 Gi1/0/7
1 239.192.0.101 igmp v2 Gi1/0/19
1 239.192.1.245 igmp v2 Gi1/0/4
1 239.192.1.246 igmp v2 Gi1/0/4
1 239.192.4.1 igmp v2 Gi1/0/19
1 239.192.4.127 igmp v2 Gi1/0/14
1 239.192.6.171 igmp v2 Gi1/0/11
[output cut]Show IGMP Group Count
Diagnostic benefit:
Shows how many IGMP groups are actively being queried on the switch. Useful for diagnosing if the number of active groups exceed the switch's capability.
Command:
sh ip igmp snooping groups countExpected output:
Total number of multicast groups: 123Check IGMP querier
Diagnostic benefit:
Determine the active querier on each vlan.
Command:
sh ip igmp snooping querier detailExpected output:
Global IGMP switch querier status
--------------------------------------------------------
admin state : Enabled
admin version : 2
source IP address : 0.0.0.0
query-interval (sec) : 60
max-response-time (sec) : 25
querier-timeout (sec) : 205
tcn query count : 2
tcn query interval (sec) : 10
Vlan 1: IGMP switch querier status
--------------------------------------------------------
elected querier is 10.100.40.5 (this switch querier)
--------------------------------------------------------
admin state : Enabled
admin version : 2
source IP address : 10.100.40.5
query-interval (sec) : 60
max-response-time (sec) : 25
querier-timeout (sec) : 205
tcn query count : 2
tcn query interval (sec) : 10
operational state : Querier
operational version : 2
tcn query pending count : 0Topology
Discover other Cisco switches connected to your switch
Diagnostic benefit:
Discover the Cisco switches that are connected to this switch, including what ports they are connected to.
Command:
sh cdp neighborsExpected output:
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
Switch Gig 1/0/23 175 S I WS-C2960- Gig 0/1Show the connected switch's details
Diagnostic benefit:
Discover more details about the Cisco switches that are connected to this switch, including IP address, IOS, native VLAN, and others.
Command:
sh cdp neighbors detailExpected output:
Device ID: Switch
Entry address(es):
IP address: 10.100.40.254
Platform: cisco WS-C2960-24TT-L, Capabilities: Switch IGMP
Interface: GigabitEthernet1/0/23, Port ID (outgoing port): GigabitEthernet0/1
Holdtime : 172 sec
Version :
Cisco IOS Software, C2960 Software (C2960-LANBASEK9-M), Version 15.0(2)SE11, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2017 by Cisco Systems, Inc.
Compiled Sat 19-Aug-17 09:34 by prod_rel_team
advertisement version: 2
Protocol Hello: OUI=0x00000C, Protocol ID=0x0112; payload len=27, value=00000000FFFFFFFF010231FF000000000000002291282A00FF0000
VTP Management Domain: ''
Native VLAN: 1
Duplex: full
Management address(es):
IP address: 10.100.40.254Spanning-Tree Protocol Status
Diagnostic benefit:
Show the status of STP on your switch per vlan, which switch is designated as the "root bridge," and what the status of each ports are.
Command:
sh spanning-tree Expected output:
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 1833.9d49.4c00
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 1833.9d49.4c00
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi1/0/24 Desg FWD 4 128.24 P2p
[output cut]Switch Environment
Show switch CPU utilization
Diagnostic benefit:
Understand if switch CPU is running at acceptable levels. Identifies processes that may be utilizing too much processing power.
Command:
sh processes cpuExpected output:
CPU utilization for five seconds: 9%/0%; one minute: 10%; five minutes: 10%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
1 0 11 0 0.00% 0.00% 0.00% 0 Chunk Manager
2 0 510 0 0.00% 0.00% 0.00% 0 Load Meter
3 6 22 272 0.00% 0.00% 0.00% 0 DHCPD Timer
4 19828 1127 17593 0.00% 0.55% 0.65% 0 Check heaps
5 0 2 0 0.00% 0.00% 0.00% 0 Pool Manager
6 0 2 0 0.00% 0.00% 0.00% 0 Timers
7 0 1 0 0.00% 0.00% 0.00% 0 License Client N
8 4193 44 95295 0.00% 0.18% 0.13% 0 Licensing Auto U
9 0 1 0 0.00% 0.00% 0.00% 0 Image License br
[output cut]Show switch CPU utilization (graph)
Diagnostic benefit:
Historical, graph version of the sh processes cpu command.
Command:
sh processes cpu historyExpected output:
11 11111111111111111111
2299999999999999999999888888888899999000000000000000111117
100
90
80
70
60
50
40
30
20
10 **********************************************************
0....5....1....1....2....2....3....3....4....4....5....5....
0 5 0 5 0 5 0 5 0 5
CPU% per second (last 60 seconds)
11113111111111111111111111111111111111111111
52642654458335556545566444245555644556885548
100
90
80
70
60
50
40
30 *
20 * * *** ** ***** **** ***** ******* *
10 ############################################
0....5....1....1....2....2....3....3....4....4....5....5....
0 5 0 5 0 5 0 5 0 5
CPU% per minute (last 60 minutes)
* = maximum CPU% # = average CPU%
100
90
80
70
60
50
40
30
20
10
0....5....1....1....2....2....3....3....4....4....5....5....6....6....7.
0 5 0 5 0 5 0 5 0 5 0 5 0
CPU% per hour (last 72 hours)
* = maximum CPU% # = average CPU%Show switch temperature and fan status
Diagnostic benefit:
Determine temperature and fan status of switch to check overheating.
Command:
sh env allExpected output:
FAN is OK
TEMPERATURE is OK
Temperature Value: 25 Degree Celsius
Temperature State: GREEN
Yellow Threshold : 50 Degree Celsius
Red Threshold : 60 Degree Celsius
SW PID Serial# Status Sys Pwr PoE Pwr Watts
-- ------------------ ---------- --------------- ------- ------- -----
1 Built-in Good
SW Status RPS Name RPS Serial# RPS Port#
-- ------------- ---------------- ----------- ---------
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