Cisco Cisco MGX-FRSM-HS2 B Serial Frame Service Module Libro blanco
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Deployment Guide
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Configuring VACL on a VLAN Monitoring a LAN
For VLAN traffic monitoring on the LAN, the traffic can be forwarded to the NAM by using the SPAN feature on the
switch. However, in some rare circumstances, if the traffic spanned exceeds the NAM’s monitoring capability, it may
be desirable to prefilter the LAN traffic before it is forwarded to the NAM. This can be achieved by using the VACL as
illustrated below.
For LAN VACL on Cisco Catalyst OS 7.5 and later, the following example demonstrates how to configure VACL for
LAN-VLAN interfaces. In this example, all traffic directed to the server 172.20.122.226 on VLAN 1 is captured and
forwarded to the NAM located at slot 3.
Cat6509(config)#access-list 100 permit ip any any
Cat6509(config)#access-list 110 permit ip any host 172.20.122.226
Cat6509(config)#vlan access-map lan 100
Cat6509(config-access-map)#match ip address 110
Cat6509(config-access-map)#action forward capture
Cat6509(config-access-map)#exit
Cat6509(config)#vlan access-map lan 200
Cat6509(config-access-map)#match ip address 100
Cat6509(config-access-map)#action forward
Cat6509(config-access-map)#exit
Cat6509(config)#vlan filter lan vlan-list 1
Cat6509(config)#analysis module 3 data-port 1 capture allowed-vlan 1
Cat6509(config)#analysis module 3 data-port 1 capture
Cat6509(config)#exit
NetFlow from the Local Switch as Data Source
NetFlow Data Export records offer an aggregate view of the network. When enabled on the local/remote switch, the
NetFlow data source becomes available on the NAM without the need to create any SPAN sessions. All traffic that is
Layer 3-switched on the Cisco Catalyst 6500 Series Policy Feature Card and all traffic that is NetFlow-switched on
the Cisco Catalyst 6500 Series Multilayer Switch Feature Card are available as NDE for monitoring. With NetFlow
available as a data source, the NAM can provide information such as hosts and conversations, applications, and so
on directly from the Cisco NAM’s application or other third-party tools.
NDE records offer broader traffic monitoring capacity, because this data source is available (once enabled from the
switch) without creating any SPAN sessions to the NAM. NetFlow data can also be obtained from remote
switches/routers. The Cisco NAM can get detailed information on the packets through the NDE records without
having to examine each packet, and hence more traffic can be analyzed. However, NetFlow only gives statistics for
applications, hosts, and conversations. Detailed monitoring for voice, VLAN, IAP, DiffServ, and packet captures and
decodes are not available with NetFlow.
The Cisco NAM-1/NAM-2 supports monitoring with both SPAN and NetFlow using independent backplane interfaces.
These two data sources complement each other to provide a very powerful and comprehensive monitoring solution.
Use NetFlow to monitor the traffic at an aggregate level to obtain application, host, and conversation statistics. For
detailed examination, use SPAN to send the traffic of interest to the NAM.
Note:
Cisco NAM-1/NAM-2 supports NetFlow versions 1, 5, 6, 7, 8, 9, and v8 aggregation caches.