Si queremos saber si el tráfico con determinado criterio pasa a través de una interfaz, podemos revisarlo usando políticas.
Son varios pasos por seguir:
Configurar una ACL que especifique el criterio que necesitemos revisar si están saliendo de la interfaz:
[R23ROUTER-2]acl 3333
[R23ROUTER-2-acl-adv-3333]rule 5 permit icmp source 172.16.100.50 0 destination 10.20.30.1 0
[R23ROUTER-2-acl-adv-3333]rule 10 permit icmp source 10.20.30.1 0 destination 172.16.100.50 0
[R23ROUTER-2-acl-adv-3333]display this
#
acl number 3333
rule 5 permit icmp source 172.16.100.50 0 destination 10.20.30.1 0
rule 10 permit icmp source 10.20.30.1 0 destination 172.16.100.50 0
#
Configurar un Traffic Classifier que esté asociado a la Access List:
[R23ROUTER-2]traffic classifier C1
[R23ROUTER-2-classifier-C1]if-match acl 3999
[R23ROUTER-2-classifier-C1]quit
[R23ROUTER-2]
Habilitar las estadísticas al configurar el Traffic Behavior
[R23ROUTER-2]traffic behavior B1
[R23ROUTER-2-behavior-B1]statistic enable
[R23ROUTER-2-behavior-B1]quit
Configurar el Traffic Policy hasta colocarle el Classifier y el Bahavior antes configurados:
[R23ROUTER-2]traffic policy P1
[R23ROUTER-2-trafficpolicy-P1]classifier C1 behavior B1
[R23ROUTER-2-trafficpolicy-P1]quit
[R23ROUTER-2]
Aplicar la política sobre la interface para poder sensar el tráfico, ya sea de entrada o de salida.
[R23ROUTER-2]interface GigabitEthernet 0/0/0
[R23ROUTER-2-GigabitEthernet0/0/0]traffic-policy P1 inbound
[R23ROUTER-2-GigabitEthernet0/0/0]
[R23ROUTER-2-GigabitEthernet0/0/0]traffic-policy P1 outbound
[R23ROUTER-2-GigabitEthernet0/0/0]quit
Empezar a generar tráfico, con un ping por ejemplo y despelgar las estadísticas:
<R23ROUTER-2>display traffic policy statistics interface GigabitEthernet 0/0/0 inbound
Interface: GigabitEthernet0/0/0
Traffic policy inbound: P1
Rule number: 2
Current status: OK!
Item Sum(Packets/Bytes) Rate(pps/bps)
------------------------------------------------------------------------------
Matched 0/0 0/0
Passed 0/0 0/0
Dropped 0/0 0/0
Filter 0/0 0/0
CAR 0/0 0/0
Queue Matched 0/0 0/0
Enqueued 0/0 0/0
Discarded 0/0 0/0
CAR 0/0 0/0
Green packets 0/0 0/0
Yellow packets 0/0 0/0
Red packets 0/0 0/0
<R23ROUTER-2>
<R23ROUTER-2>
<R23ROUTER-2>display traffic policy statistics interface GigabitEthernet 0/0/0 outbound
Interface: GigabitEthernet0/0/0
Traffic policy outbound: P1
Rule number: 2
Current status: OK!
Item Sum(Packets/Bytes) Rate(pps/bps)
------------------------------------------------------------------------------
Matched 0/0 0/0
Passed 0/0 0/0
Dropped 0/0 0/0
Filter 0/0 0/0
CAR 0/0 0/0
Queue Matched 0/0 0/0
Enqueued 0/0 0/0
Discarded 0/0 0/0
CAR 0/0 0/0
Green packets 0/0 0/0
Yellow packets 0/0 0/0
Red packets 0/0 0/0
<R3ROUTER-1>
