How to "SPAN/mirror" a port on ISR 4431?

[Gronk]

Hello everyone,

I need some help finding a solution for live packet capture on a ISR4431.

I know the ISR routers don't have a span/mirror port capability like switches do.
The closest thing I have found is the embedded packet capture feature which unfortunately will not suffice for what we intend. 
Someone suggested to me to "bridge" connections/ports, but my "googlefoo" skills are lacking and I can't seem to find a detailed description on how to do that or whether it's a viable solution at all.

Any insight would be greatly appreciated.

[balaji.bandi]

Dpends on verion of code you using - you can ERSPAN i guess

[Gronk]

Runing IOS version 16.9

[balaji.bandi · Accepted solution]

You can use ERPSPAN below exmaple help you :

https://mrncciew.com/2017/08/17/configuring-erspan/

https://content.cisco.com/chapter.sjs?uri=/searchable/chapter/content/en/us/td/docs/ios-xml/ios/lanswitch/configuration/xe-3s/lanswitch-xe-3s-book/lnsw-conf-erspan.html.xml

EDIT :

you can also do capture in the box PCAP and sent to TFTP let me know if you  looking that example ?