Once you get the single value field through stats command ( I have renamed stats count as status as it make more sense)
You should define rangemap first on status to apply colors according to value (rangemap can either be low, high, severe, critical or green, cyan, amber, red etc). Refer to rangemap documentation for details (http://docs.splunk.com/Documentation/Splunk/6.5.0/SearchReference/Rangemap)
Then finally use another eval expression to rename the rangemap field as string for more meaning like Impacted, Down, OK etc. in your case. Use case instead of nested if as this is less confusing and less likely error prone.
index=network sourcetype=juniper
host=RouterA AND ospf_interface="ge-0/0/0.0" |
RPD_OSPF_NBR* "Full to Down" |
dedup ospf_interface |
stats count as status | rangemap field=status low=0-0 high=1-1 severe=2-2 default=low | eval status=case(status== 1, "Impacted", status== 2, "Down", 1==1,"OK")
PS: You should also consider 0 value whether it is Low or Severe. I have treated that as Low in the following example.
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