Netbios Rebroadcast; Multinetting (Multiple Subnets Per Vlan) - Avaya P333R-LB User Manual

Chapter 1 Overview
P333R-LB protocol preferences are listed below from the most to the least preferred:
1 Local (directly attached net)
2 High-preference static (manually configured routes)
3 OSPF internal routes
4 RIP
5 OSPF external routes
6 Low-preference static (manually configured routes).

Netbios Rebroadcast

The P333R-LB can be configured to relay netbios UDP broadcast packets. This
feature is used for applications such as WINS that use broadcast but may need to
communicate with stations on other subnets or VLANs.
Configuration is performed on a per-interface basis. When a netbios broadcast
packet arrives from an interface on which netbios rebroadcast is enabled, the packet
is distributed to all other interfaces configured to rebroadcast netbios.
If the netbios packet is a net-directed broadcast (e.g., 149.49.255.255), the packet is
relayed to all other interfaces on the list, and the IP destination of the packet is
replaced by the appropriate interface broadcast address.
If the netbios broadcast packet is a limited broadcast (e.g., 255.255.255.255), it is
relayed to all VLANs on which there are netbios-enabled interfaces. In that case, the
destination IP address remains the limited broadcast address.

Multinetting (Multiple Subnets per VLAN)

In Router Mode, most applications such as RIP and OSPF, operate per IP interface.
Other applications such as VRRP and DHCP/BOOTP Relay operate per VLAN.
Configuration of these applications is done in the Interface mode. When there is
only a single interface (subnet) per VLAN then system behavior is intuitive since a
subnet and a VLAN are the same.
If the configuration includes multiple interfaces (subnets) per VLAN things start to
get complicated.
For example, if there are two interfaces over the same VLAN and you configure
DHCP server on one interface it will be used also for the second interface over the
same VLAN. This behavior might be less expected and in some cases wrong.
In order to prevent misconfiguration and unexpected results, the P333R-LB
prevents configuration of VLAN-oriented commands on an interface unless the user
explicitly requested to using the new "enable vlan commands" CLI command.
Configuration of "enable vlan commands" on an interface overrides this
configuration on other interfaces that belong on the same VLAN.
This ensures that VLAN-oriented commands can be configured from one interface
only.
10 Avaya P333R-LB User's Guide