Remote mirroring overview

To configure a remote mirroring session in which the mirroring source and destination are on different switches, follow these general steps:

Determine the IP addressing, UDP port number, and destination (exit) port number for the remote session:
1. Source VLAN or subnet IP address on the source switch.
2. Destination VLAN or subnet IP address on the destination switch.
3. Random UDP port number for the session (7933-65535.)
4. Remote mirroring endpoint: Exit port and IP address of the remote destination switch (In a remote mirroring endpoint, the IP address of the exit port and remote switch can belong to different VLANs. Any loopback IP address can be used except the default loopback address 127.0.0.1.)
Requirement: For remote mirroring, the same IP addressing and UDP port number must be configured on both the source and destination switches.
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.
Determine the session (1 to 4) and (optional) alphanumeric name to use on the source switch.
Determine the traffic to be filtered by any of the following selection methods and the appropriate configuration level (VLAN, port, mesh, trunk, global):
1. Direction: inbound, outbound, or both.
2. Classifier-based mirroring policy: inbound only for IPv4 or IPv6 traffic.
3. MAC source and/or destination address: inbound, outbound, or both.
On the source switch:
1. Enter the mirror command with the session number (1 to 4) and the IP addresses and UDP port number from step 1 to configure a mirroring session. If desired, enter the [truncation] parameter to allow oversize packets to be truncated rather than dropped.
2. 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-policy policy-name in ]vlan vid [ monitor | service-policy policy-name in ]monitor mac mac-addr

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

Quick reference to remote mirroring setup

, Commands to 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 destination 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.

prev	up	next
Using the Menu to configure local mirroring	home	High-level overview of the mirror configuration process