Brocade Network OS Administrator’s Guide v4.1.1 - Manual (Page 534)

Standard SPAN guidelines and limitations
Brocade recommends that you be aware of the following standard guidelines for and limitations of
SPAN connections:
• For the Brocade VDX 6720-24:
‐ The mirror port can be any port in the switch.
‐ Only one port per switch can be configured as a destination port for ingress mirroring.
‐ Only one port per switch can be configured as a destination port for egress mirroring.
• For the Brocade VDX 6720-60:
‐ The mirror port should be in the same port-group as the source port.
‐ Only one port per port-group can be configured as a destination port for ingress mirroring.
‐ Only one port per port-group can be configured as a destination port for egress mirroring.
• The mirror port should not be configured to carry normal traffic.
• A port cannot be mirrored to multiple locations in the same direction.
• A port cannot be made a destination port for bidirectional mirroring if a different port supported by
that ASIC is already configured as destination port for any type of mirroring.
• If a port is configured as a destination port for bidirectional mirroring, no other port supported by that
ASIC can be made a destination port for any type of mirroring.
• The destination mirror port can handle from 1 to 40 Gbps (line rate) worth of mirror traffic,
depending on the capability of the destination port. If multiple ports, or both flows on the same port,
are mirrored to the same destination mirror port, then only the destination port’s capacity worth of
mirror traffic is mirrored and the remaining traffic is ignored.
• If the source port receives burst traffic and the destination mirror port cannot handle all the bursts,
some of the burst traffic is not mirrored.
• Mirroring of Inter-Switch Link (ISL) ports is supported, but the destination port should reside on the
same RBridge.
• Mirroring of LAG or port-channel interfaces is not supported, but LAG members can be mirrored.
• TRILL ports cannot be designated as a destination port.
• TRILL ports can be a source port, but mirroring is restricted to the port local to the source node
ports.
• Inter-ASIC port mirroring is not allowed on the Brocade VDX 6720-60.
• Ethernet Pause frames are not mirrored.
• Mirroring of trunk port is not supported, although the ASIC supports the mirroring of a trunk. To
mirror a trunk, you must individually enable mirroring on all member ports.
• The multicast and broadcast statistics are correctly updated on TX ports for mirrored traffic.
• All commands except for shutdown and no shutdown are blocked on a destination mirror port.
• The interface counters are cleared when a port is successfully designated as a destination mirror
port.
• The show interface command hides the Receive Statistics and Rate Info (Input) information for a
destination mirror port.
• The MTU of a port should be set to the default value of 2500 bytes before it is made a destination
mirror port. When the port is successfully designated as the destination mirror, the MTU of that port
is automatically set to the maximum value of 9216 bytes. When the port becomes a nondestination
mirror, the MTU is restored to the default value.
• Port mirroring is supported on any physical front-end user-configurable port. The source port can be
part of a LAG, VLAG, VLAN, or any other user configuration
• A maximum of 512 mirror sessions are supported in logical chassis cluster and fabric cluster
modes, but 24 sessions in standalone mode.
Standard SPAN guidelines and limitations
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