Troubleshooting Mirroring - ProCurve 6200yl Management And Configuration Manual

Monitoring and Analyzing Switch Operation
Traffic Mirroring
B-72
Switch Operation as Both Destination and Source: A switch config-
■
ured as remote destination switch can also be configured to mirror traffic
to one of its own ports (local mirroring) or to a destination on another
switch (remote mirroring).
■ Monitor Command Note: If session 1 is already configured with a
destination, you can execute [no] vlan < vid > monitor or [no] interface
< port > monitor without mirroring criteria and a mirror session number. In
this case, the switch automatically configures or removes mirroring for
inbound and outbound traffic from the specified VLAN or port(s) to the
destination configured for session 1.
Loss of Connectivity Suspends Remote Mirroring: When a remote
■
mirroring session is configured on a source switch, the switch sends an
ARP request to the configured destination approximately every 60 sec-
onds. If the source switch fails to receive the expected ARP response from
the destination for that session, transmission of mirrored traffic for the
session halts. However, because the source switch continues to send ARP
requests for each configured remote session, link restoration or discovery
of another path to the destination enables the source switch to resume
transmitting the session's mirrored traffic after a successful ARP/
response cycle occurs. Note that if a link's connectivity is repeatedly
interrupted ("link toggling"), little or no mirrored traffic may be allowed
for any sessions using that link. To verify the status of any mirroring
session configured on the source switch, use show monitor.

Troubleshooting Mirroring

Mirrored traffic does not reach configured remote destination switch or
remote exit port.
For a given mirroring session, the mirror command parameters con-
•
figured on the source switch for source IP address, source UDP port,
and destination IP address must be identical to their counterparts in
the mirror endpoint command configured on the destination switch.
• The configured exit port must not be a member of a trunk or mesh.
• If the destination for mirrored traffic is on a different VLAN than the
source, routing must be correctly configured along the path from the
source to the destination.
• On the destination switch for a given mirroring session, both the port
on which the mirrored traffic enters the switch and the exit port must
be members of the same VLAN.
• All links on the path from the source switch to the destination switch
must be active.