Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.112.1P1 - Page 134
Enabling Flow-Based Monitoring
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The ACL agent module saves monitoring details in its local database and also in the CAM region to monitor packets that match the specified criterion. The ACL agent maintains data on the source port, the destination port, and the endpoint to which the packet must be forwarded when a match occurs with the ACL entry. If you configure the flow-based enable command and do not apply an ACL on the source port or the monitored port, both flow-based monitoring and port mirroring do not function. Flow-based monitoring is supported only for ingress traffic and not for egress packets. The port mirroring application maintains a database that contains all monitoring sessions (including port monitor sessions). It has information regarding the sessions that are enabled for flow-based monitoring and those sessions that are not enabled for flow-based monitoring. It downloads monitoring configuration to the ACL agent whenever the ACL agent is registered with the port mirroring application or when flow-based monitoring is enabled. The show monitor session session-id command has been enhanced to display the Type field in the output, which indicates whether a particular session is enabled for flow-monitoring. Example Output of the show Command Dell# show monitor session 1 SessID Source Destination Dir TTL Drop Rate Gre-Protocol FcMonitor ----------- --- 1 Te 1/2 remote-ip rx 0 No N/A N/A yes Dell# Mode ---Port Source IP --------- 0.0.0.0 Dest IP -------0.0.0.0 The show config command has been modified to display monitoring configuration in a particular session. DSCP ---- 0 Example Output of the show Command The show ip | mac | ipv6 accounting commands have been enhanced to display whether monitoring is enabled for traffic that matches with the rules of the specific ACL. Example Output of the show Command Dell# show ip accounting access-list ! Extended Ingress IP access list kar on TenGigabitEthernet 1/1 Total cam count 1 seq 5 permit ip 192.168.20.0/24 173.168.20.0/24 monitor Dell#show ipv6 accounting access-list ! Ingress IPv6 access list kar on TenGigabitEthernet 1/1 Total cam count 1 seq 5 permit ipv6 22::/24 33::/24 monitor Enabling Flow-Based Monitoring Flow-based monitoring is supported on the S4820T platform. Flow-based monitoring conserves bandwidth by monitoring only specified traffic instead of all traffic on the interface. This feature is particularly useful when looking for malicious traffic. It is available for Layer 2 and Layer 3 ingress and egress traffic. You can specify traffic using standard or extended access-lists. 1 Enable flow-based monitoring for a monitoring session. MONITOR SESSION mode 134 Access Control Lists (ACLs)
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