Span Switch Ports

monitor session 1 source interface Gi1/0/1 both
monitor session 1 destination interface G2/0/1

No monitor session 1 source interface Gi1/0/1 both
No monitor session 1 destination interface G2/0/1


IOS XE On Device Capture

SWITCH
monitor capture TEST interface gigabitEthernet 1/0/1 both
monitor capture TEST limit pps 100000
monitor capture TEST limit packet-len 9500
monitor capture TEST match ipv4 any any buffer size 100
monitor capture TEST start
monitor capture TEST stop

monitor capture TEST export location flash: (or export to tftp to skip the next step) 
copy flash:TEST.pcap tftp:
no monitor capture TEST 



ROUTER
monitor capture CAP interface GigabitEthernet0/0/0.100 both
monitor capture CAP interface GigabitEthernet0/0/0.200 both
monitor capture CAP interface GigabitEthernet0/0/1 both
monitor capture CAP interface GigabitEthernet0/0/2 both
monitor capture CAP limit pps 100000
monitor capture CAP limit packet-len 9500
monitor capture CAP match ipv4 any any buffer size 100
monitor capture CAP start
monitor capture CAP stop

monitor capture CAP export bootflash:CAP.pcap
copy bootflash:CAP.pcap tftp:
no monitor capture CAP 



Another option see: traffic-export interface XX


Logging Discriminator

With ISE deployments it was nice to add a discriminator to clear out the never ending 802.1x messages.


One Off Commands

I think this will work savior:
Router#reload in [X]

Broadcast storms: 
show int | i line|txload
show int | I up|txload 

sh int status | i not - Disconnected ports 

test cable-diagnostics tdr interface fi5/0/12
Sh cable-diagnostics tdr interface fi5/0/12

Unsupported ; )

#service unsupported-transceiver
allow other transceivers
 
#no errdisable detect cause gbic-invalid
no errdisable a port with non-cisco transceiver