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Chapter 1
Overview
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 Avaya P333R
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.
In case there is only one interface over a VLAN, then VLAN oriented commands for
this VLAN can be configured through the single interface without the need to issue
the "enable vlan command" command.
Note:
1. VLAN-oriented commands that were configured affect the VLAN of the interface
that was used at the time the command was issued.
2. If the interface is moved to another VLAN (using the "ip vlan command") VLAN
oriented configuration still relates to the original VLAN.
Router Configuration File
The Configuration File feature allows the user to read the P333R routing
configuration parameters and save them to a file on the station. The routing
configuration commands in the file are in CLI format. The user can edit the file (if
required) and re-configure the P333R by downloading the configuration file.
Although the file can be edited, it is recommended to keep changes to the file to a
minimum. The recommended configuration method is using Avaya Multi-Service
Network Manager P330 Device Manager and/or the CLI. Changes to the
configuration file should be limited to those required to customize a configuration
file from one router to suit another.
14
Avaya P333R User's Guide
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