Another way to monitor what is happening to your Juniper router is to use the Tracing.
Tracing is similar to debugging if you come from the Cisco world. What tracing does, it shows us directly and live what is happening on our Juniper router. Of course, tracing takes load on the Juniper hardware resources, so you should use it with caution, and you should trace one thing at a time.
In in the previous lesson, I gave you the example of the broken leg to make the topic easier to be understood, I will use the same example also here 😊
With tracing, it is like someone got a broken leg and he went to the doctor who directly put him under the surgery and looked directly what is broken on his leg then fixed it. Same on the trace, you see what is happening directly on the Juniper router then you can take an immediate action to fix it.
As the syslog, tracing are stored in /var/log directory. You can also send them to a server if you want.
Let’s apply a LAB now to see how tracing works.
I will do tracing on OSPF even though that I don’t have OSPF protocol enabled on my router. If you do not know what OSPF protocol is, it is a dynamic routing protocol that you can use to allow the router to dynamically learn routes from other routers that have OSPF protocol enabled on them. Don’t worry about it, just OSPF is here to show you how tracing works.
root@Juniper# edit protocols ospf
[edit protocols ospf]
root@Juniper# set ?
Possible completions:
+ apply-groups Groups from which to inherit configuration data
+ apply-groups-except Don’t inherit configuration data from these groups
> area Configure an OSPF area
> backup-spf-options Configure options for backup SPF
> database-protection Configure database protection attributes
disable Disable OSPF
+ export Export policy
external-preference Preference of external routes
> graceful-restart Configure graceful restart attributes
+ import Import policy (for external routes or setting priority)
no-nssa-abr Disable full NSSA functionality at ABR
no-rfc-1583 Disable RFC1583 compatibility
> overload Set the overload mode (repel transit traffic)
preference Preference of internal routes
prefix-export-limit Maximum number of prefixes that can be exported
reference-bandwidth Bandwidth for calculating metric defaults
rib-group Routing table group for importing OSPF routes
> spf-options Configure options for SPF
> topology Topology parameters
> traceoptions Trace options for OSPF
> traffic-engineering Configure traffic engineering attributes
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