PfR:Troubleshooting:Learning

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Not Learning
Is traffic flowing through the border router (internal to one of the external)
show ip cache flow

or if you use Flexible Netflow (Preferred)

sh flow monitor MYMONITOR cache format table

on BR multiple time

No > Traffic should be going from one of the internal interface to one of the external interfaces.
Yes
Is learning enabled on the Master?
show oer master

shows learn state should not be disabled and verify the periodic and monitor timer to be same as configured.

No > Enable learn:
oer master
  learn
    throughput
    monitor-period <x>
    periodic-interval <y>
Yes
Is learning enabled periodically on the border?
show oer border passive learn 

on BR (Status should not be disabled)

No > Enable learn:
oer master
  learn
    throughput
    monitor-period <x>
    periodic-interval <y>
Yes
Is learning cache populated on the border?
show oer border passive cache learn traffic-class

on BR multiple times should not be empty

Yes
Is learn-list used?
Yes
Is throughput or delay and traffic-class configured under each learn-list?
show run 

and look for throughput or delay under oer master/learn list

No > Configuration sample:
pfr master
 policy-rules MAP
   learn
    list sequence 10 ref name MYLIST
     throughput
     traffic-class access-list MYACL
Yes
Has learn-list a policy assigned to it?
show run

or

show oer master
No > Configuration sample:
oer-map MAP 10
 match oer learn list MYLIST
You should have:
MC#show oer master
...
  Learn-List seq 10 MYLIST
    Configuration:
     Traffic-Class Access-list: MYACL
...
   Status: ACTIVE <===== should be active

Rating: 5.0/5 (6 votes cast)

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