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Présentation : Most readers are probably familiar with the switchport analysis SPAN feature on Cisco's Catalyst switches. SPAN replicates all ingress and or egress traffic from one or several interfaces to another for the purposes of packet capture or traffic monitoring. This is especially helpful when deploying a network-based IDS. Unfortunately, it's often not possible to install the IDS on the same physical switch as the ports from which you want to capture. Remote SPAN RSPAN can be employed to extend a SPAN session between source and destination points on disparate switches, however it requires a layer two path end-to-end. When we need to replicate layer two traffic across a layer three network, we turn to encapsulated remote SPAN ERSPAN . ERSPAN transports traffic inside a point-to-point GRE tunnel between arbitrary IP endpoints. For this lab, we'll configure an ERSPAN session from an NX-OS source a Nexus 7K to an IOS destination a Cisco 7600 to provide an example configuration for both platforms. MPLS transport is used between the two switches and routing of the ERSPAN tunnel will take place inside a VRF named Capture. erspan_topology.png Continue reading
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