User:Syoder/Monitoring

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(New page: == Aggregate Ethernet Monitoring Setup == Hardware setup uses an Ethernet tap and requires 2 Ethernet ports on the router per Ethernet port tapped to monitor traffic in both directions. O...)
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Hardware setup uses an Ethernet tap and requires 2 Ethernet ports on the router per Ethernet port tapped to monitor traffic in both directions. Our example uses Ethernet1 and Ethernet2 to receive the traffic from the tap. The ports are bridged together to allow a capture program to monitor both flows of traffic simultaneously.
Hardware setup uses an Ethernet tap and requires 2 Ethernet ports on the router per Ethernet port tapped to monitor traffic in both directions. Our example uses Ethernet1 and Ethernet2 to receive the traffic from the tap. The ports are bridged together to allow a capture program to monitor both flows of traffic simultaneously.
-
interface bvi1
+
  interface bvi1
-
description Ethernet Ports 1+2
+
  description Ethernet Ports 1+2
-
no ip address
+
  no ip address
-
!
+
  !
-
interface Ethernet1
+
  interface Ethernet1
-
no ip address
+
  no ip address
-
bridge-group 1 spanning-disabled horizon 1
+
  bridge-group 1 spanning-disabled horizon 1
-
!
+
  !
-
interface Ethernet2
+
  interface Ethernet2
-
no ip address
+
  no ip address
-
bridge-group 1 spanning-disabled horizon 1
+
  bridge-group 1 spanning-disabled horizon 1
-
!
+
  !
Even though the hardware tap disconnects the transmit lines we shouldn't be transmitting any data on the ports. We use the split-horizon feature of bridging to prevent packets received on one port from being transmitted on the other port.
Even though the hardware tap disconnects the transmit lines we shouldn't be transmitting any data on the ports. We use the split-horizon feature of bridging to prevent packets received on one port from being transmitted on the other port.

Revision as of 19:46, 5 June 2008

Aggregate Ethernet Monitoring Setup

Hardware setup uses an Ethernet tap and requires 2 Ethernet ports on the router per Ethernet port tapped to monitor traffic in both directions. Our example uses Ethernet1 and Ethernet2 to receive the traffic from the tap. The ports are bridged together to allow a capture program to monitor both flows of traffic simultaneously.

 interface bvi1
  description Ethernet Ports 1+2
  no ip address
 !
 interface Ethernet1
  no ip address
  bridge-group 1 spanning-disabled horizon 1
 !
 interface Ethernet2
  no ip address
  bridge-group 1 spanning-disabled horizon 1
 !

Even though the hardware tap disconnects the transmit lines we shouldn't be transmitting any data on the ports. We use the split-horizon feature of bridging to prevent packets received on one port from being transmitted on the other port.

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