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D-Link DGE-560SX User Guide
55
Balance Modes and Limitations
Smart Load-balance (SLB) is a protocol-specific scheme and the level of support for IP, IPX,
and other protocols are listed below.
Table 1: Balance Modes and Limitations
Protocol
Load Balancing Support Fault Tolerance Support
IP
Yes
Yes
IPX
Yes*
Yes**
Other protocols No
Yes**
*Only outbound load-balancing for IPX (on NetWare only).
**Only for Broadcom NICs. Alteon's driver ALT.LAN must be version 2.05b or newer released
by Broadcom.
SLB works with all Ethernet switches without configuring the switch ports to any special
trunking mode. Only IP traffic is load-balanced in both inbound and outbound directions. IPX
traffic will be load-balanced in outbound direction only. Other protocol packets will be sent
and received through one primary NIC only. Fault-tolerance for non-IP traffic is only
supported using Broadcom or Alteon NICs.
The Generic Trunking mode requires the Ethernet switch to support some form of port
trunking mode (Cisco's Gigabit EtherChannel or other switch vendor's link aggregation mode).
Trunking mode must be statically configured on the switch ports that are connected to the
team. This mode is protocol-independent and all traffic should be load-balanced and
fault-tolerant.
The IEEE 802.3ad mode requires the Ethernet switch to support IEEE 802.3ad with LACP
(Link Aggregation Control Protocol). LACP will try to configure the maximum number of NICs
in the team that are compatible for link aggregation. If LACP determines that some NICs are
not able to aggregate (because of some restrictive limitations or configurations on the switch),
the remaining NICs that cannot aggregate will be idle. If LACP is completely disabled on the
switch, then only one of the NICs in the team will be used. Some switches require the LACP
ports to be in full-duplex mode for them to work. LACP can be configured active or passive on
the team and most switches allow active or passive selections on a per port basis. At least one
side of each connection must be active otherwise the connection will never be selected for