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Limitations 47
NetBIOS sessions occurs if the primary link fails and the redundant link is activated.
If this happens, end users need to log on and initiate another session.
Maximum BSC Line
Speed
For V.35 and RS-232 links, the maximum baud rate supported for BSC traffic is
38.4. If the baud rate is higher, BSC traffic suffers errors and retransmissions.
Multilink PPP
Configurations
Multilink PPP (MLP) is supported for multiple WAN links connected to the same
port running PPP.
When configuring MLP:
■ For maximum performance on a NETBuilder II bridge/router, 3Com
recommends that similar hardware interface types be configured for each MLP
bundle. For instance, bundle HSS modules with HSS modules, and bundle HSS
3-port module links with HSS 3-port module links.
■ For the best performance, use MLP on interfaces with matched line speeds.
Avoid mismatched baud rates of ratios greater than 10 to 1 for bundled links.
■ If your baud rate ratios on two links are greater than 4 to 1, the MLP feature
automatically turns off fragmentation. For baud ratios of less than 4 to 1, you
may choose to turn off fragmentation for performance considerations. Turn off
fragmentation using the MlpCONTrol parameter in the PPP Service.
■ MLP does not support the HSSI module.
■ Before you re-enable a port running MLP, disable the port and allow the remote
port to go down. This action prevents loss of packet sequence numbers
synchronization, which causes packets to be dropped when the MLP port is
enabled.
Multiport MBRI Module
SNMP Management
The Multiport MBRI module cannot be configured using SNMP.
NAT Proxy ARP NAT does not support proxy ARP. If the NETBuilder bridge/router is configured for
NAT private address space, you should use a different network address on the RHS
other than the directly connected network IP address. Additionally, you should
specify a static route to that address on the remote host.
RouteDiscovery If RouteDiscovery is enabled on all protocols (-SR RouteDiscovery = All), in the
maximum packet forwarding rate drops significantly during route discovery. 3Com
recommends that you enable RouteDiscovery only for the protocols you use.
Increasing the value of the -SR HoldTime parameter minimizes the drop in
forwarding rate for these protocols.
SDHLC Half-Duplex
Mode
SDHLC does not support physical half-duplex mode.
SDLC SDLC requires the following:
■ XID spoofing must be turned on if the IBM Communication Manager is used
for 3270 communications and is defined as a PU type 2.0. Use the following
syntax:
SETDefault !<PU name> -SDLC CUXId = <value> (8 Hexadecimal digits)
SETDefault !<PU name> -SDLC CUXidDefined = Yes