Cisco
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Publicado: 28 de noviembre de 2012
How to configure port monitoring (SPAN) on a Catalyst 2940, 2950, 2955, 2970, 3550 or 3750 series switch
Resolution
You can analyze network traffic passing through ports by using Switched PortAnalyzer (SPAN). This sends a copy of the traffic to another port on the switch that has been connected to a SwitchProbe device, another Remote Monitoring (RMON) probe or security device. SPAN mirrorsreceive or transmit (or both) traffic on one or more source ports to a destination port for analysis.
Remote SPAN (RSPAN) extends SPAN by enabling RMON of multiple switches across your network. Thetraffic for each RSPAN session is carried over a user-specified RSPAN VLAN that is dedicated for that RSPAN session in all participating switches. The SPAN traffic from the sources is copied onto theRSPAN VLAN through a reflector port and then forwarded over trunk ports carrying the RSPAN VLAN to any RSPAN destination session monitoring the RSPAN VLAN. SPAN and RSPAN do not affect the switching ofnetwork traffic on source ports. A copy of the packets received or sent by the source interfaces are sent to the destination interface. Except for traffic that is required for the SPAN or RSPANsession, reflector ports and destination ports do not receive or forward traffic. These are configuration examples:
• This example shows how to set up a SPAN session (session 1) for monitoring sourceport traffic to a destination port. First, any existing SPAN configuration for session 1 is cleared and then bidirectional traffic is mirrored from source port 1 to destination port 10:Switch(config)# no monitor session 1 Switch(config)# monitor session 1 source interface fastEthernet0/1 Switch(config)# monitor session 1 destination interface fastEthernet0/10 encapsulation dot1q Switch(config)#end • This example shows how to configure the destination port for ingress traffic on VLAN 5 by using a security device that does not support 802.1q encapsulation:
Postings may contain unverified...
Resolution
You can analyze network traffic passing through ports by using Switched PortAnalyzer (SPAN). This sends a copy of the traffic to another port on the switch that has been connected to a SwitchProbe device, another Remote Monitoring (RMON) probe or security device. SPAN mirrorsreceive or transmit (or both) traffic on one or more source ports to a destination port for analysis.
Remote SPAN (RSPAN) extends SPAN by enabling RMON of multiple switches across your network. Thetraffic for each RSPAN session is carried over a user-specified RSPAN VLAN that is dedicated for that RSPAN session in all participating switches. The SPAN traffic from the sources is copied onto theRSPAN VLAN through a reflector port and then forwarded over trunk ports carrying the RSPAN VLAN to any RSPAN destination session monitoring the RSPAN VLAN. SPAN and RSPAN do not affect the switching ofnetwork traffic on source ports. A copy of the packets received or sent by the source interfaces are sent to the destination interface. Except for traffic that is required for the SPAN or RSPANsession, reflector ports and destination ports do not receive or forward traffic. These are configuration examples:
• This example shows how to set up a SPAN session (session 1) for monitoring sourceport traffic to a destination port. First, any existing SPAN configuration for session 1 is cleared and then bidirectional traffic is mirrored from source port 1 to destination port 10:Switch(config)# no monitor session 1 Switch(config)# monitor session 1 source interface fastEthernet0/1 Switch(config)# monitor session 1 destination interface fastEthernet0/10 encapsulation dot1q Switch(config)#end • This example shows how to configure the destination port for ingress traffic on VLAN 5 by using a security device that does not support 802.1q encapsulation:
Postings may contain unverified...
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