I was looking for a template that gave me as much information as possible on a Cisco device, working on Zabbix 4.0.x + and quick implementation of multiple Zabbix servers. Template is based on the stock Cisco SNMPv2 template but with some additional content

- Device Model Name
- FAN Discovery
- Power Supply
- Temperature
- CPU Discovery
- Serial Numbers Discovery
- Memory Discovery
- Network interfaces Discovery

Based on your device it will create around:
150-250 items
100-150 triggers
20-50 graphs

Tested and worked in my case on:
Cisco 800
Cisco 878 k9
Cisco 881
Cisco 803

As it is based on the default Cisco SNMPv2 template it will work on every generic Cisco Router/Switch.