• Meshing and Distributed Trunking features are mutually exclusive.
• Routing and Distributed Trunking features are mutually exclusive.
• IGMP and DHCP snooping, ARP-protect, and STP are not supported on DT trunks.
• Q-in-Q in mixed VLAN mode and DT are mutually exclusive.
• ISC ports will be part of all VLANs—i.e., they will become members of a VLAN once that VLAN is configured.
• ISC port can be an individual port or a manual LACP trunk, but a dynamic LACP trunk can't be configured as
an ISC port .
• Maximum of 8 links in a DT trunk across two switches is supported with a maximum of 4 links per DT switch.
• The current limitation of 60 manual trunks in a switch will now include DT manual trunks too.
• One ISC is supported per switch for a maximum of 60 DT trunks supported in the switch.
• Spanning Tree Protocol is disabled (i.e., PDUs are filtered) on DT ports.
An example of upstream traffic forwarding is as follows
Assuming the uplink connected to Switch B is blocked by STP and only an uplink in Switch A is active . Server 1
sent traffic with load-balance across its 802 .3ad LACP links . If the receiving switch is Switch A, which learns the
destination MAC from any of the upstream links, it will forward the unicast frames to destination directly via its
upstream link . If Switch B receives the unicast frame from the server and it learns DA (destination address) MAC
from Switch A, Switch B will forward the frames to Switch A, and in turn Switch A forwards the frames to the
destination via its upstream link . Thus, unicast frames are always forwarded by only one of the DT switches .
Appendix K: Troubleshooting
LED status indicators for Switch 8200zl series
The HP ProCurve Switch 8200zl Management Module has various LED status indicators that are described in
Table A1 .
Table A1: LED status indicators for management/system support module
(marked as "DIM")
Module on the
The switch is receiving power .
The switch is NOT receiving power .
On briefly at the beginning of switch self-test, after the switch is powered on or reset . If on for a
prolonged time, the switch has encountered a fatal hardware failure, or has failed its self-test .
The normal state; indicates there are no fault conditions on the switch .
A fault has occurred on the switch, one of the switch modules, an individual port, a power supply, or
a fan . The Status LED for the module or other device with the fault will flash simultaneously .
The switch self-test and initialization are in progress after you have power-cycled or reset the switch .
The switch is not operational until this LED goes off . The Self-Test LED also comes on briefly when you
"hot-swap" a module into the switch and the module is automatically self-tested .
Normal operation; the switch is not undergoing self-test .
A component of the switch has failed its self-test . The Status LED for that component—for example, a
switch module—and the switch Fault LED will flash simultaneously .
Normal operation .
DIMM status is unknown .
If DIMM, Fault, and Self-Test LEDs are blinking, DIMM failed self-test . If DIMM and Fault LEDs are
blinking, an operational fault has occurred . If blinking at a fast rate, an operational alert occurred
and is unresolved .
Flash Card status is known and fault-free .
Flash Card status is unknown .
If Flash, Fault, and Self-Test LEDs are blinking, Flash Card failed self-test .
If Flash and Fault LEDs are blinking, an operational fault has occurred .
If blinking at a fast rate, an operational alert occurred and is unresolved . For example, Flash Card is
not present .