# Monitoring

> Markdown source of <https://docs.calebsargeant.com/networking/cisco/switching/monitoring/>.

## Implementing Syslog

- Your switch can store syslog messages locally
- Syslog uses UDP port 514

``` text
lin con 0
logging synchronous
logging 172.30.100.30
logging trap debugging
```

## Understanding SNMP

- SNMP "simply" grabs statistics from devices
- Monitoring applications manipulate and message data
- Three SNMP versions

``` text
snmp-server community $up3r$ecr3t ro
access-list 10 permit 172.30.100.30 0.0.0.0
snmp-server community $up3r$ecr3t ro 10
do sh run | i snmp
```

## Understanding IP SLA

- A way of detecting link failure using real time data
- A way of testing service levels on a line
- A way to add valuable data to network monitoring
- A way to impress your friends
- SLA endpoint can be either a device or ip sla responder

``` text
ip sla 100
icmp-ech 4.2.2.2
frequency 5
ip sla schedule 100 start-time now life forever
track 1 rtr 100 reachability
sh ip sla statistics
ip route 0.0.0.0 0.0.0.0 216.22.345.122 track 100
```