Monitoring and Analyzing Switch Operation

Traffic Mirroring

2.On the remote destination (endpoint) switch, enter the mirror endpoint command with the information from step 1 to configure a mirroring session for a specific exit port.

3.Determine the session (1 - 4) and (optional) alphanumeric name to use on the source switch.

4.Determine the traffic to be filtered by any of the following selection methods and the appropriate configuration level (VLAN, port, mesh, trunk, global):

a.Direction: inbound, outbound, or both

b.Classifier-based mirroring policy: inbound only for IPv4 or IPv6 traffic

c.MAC source and/or destination address: inbound, outbound, or both

5.On the source switch:

a.Enter the mirror command with the session number (1 - 4) and the IP addresses and UDP port number from step 1 to configure a mirroring session.

b.Enter one of the following commands to configure one or more of the traffic-selection methods in Step 4 for the configured session: interface < port/trunk/mesh > < monitor service-policypolicy-namein >

vlan < vid > < monitor service-policy policy-namein > monitor mac < mac-addr>

After you complete Step 5b, the switch begins mirroring traffic to the remote destination (endpoint) configured for the session.

Quick Reference to Remote Mirroring Set-Up. The following com­ mands configure mirroring for a remote session in which the mirroring source and destination are on different switches:

The mirror command identifies the destination in a mirroring session.

The interface and vlan commands identify the monitored interface, traffic direction, and traffic-selection criteria for a specified session.

Caution

When configuring a remote mirroring session, always configure the destina­

 

tion switch first. Configuring the source switch first can result in a large

 

volume of mirrored, IPv4-encapsulated traffic arriving at the destination

 

without an exit path, which can slow switch performance.

 

 

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