Avaya P332G-ML manual Route Preferences, Netbios Rebroadcast

Chapter 1 Overview

By default, the P332G-ML does not redistribute routes between OSPF and RIP. Redistribution from one protocol to the other can be configured. Static routes are, by default, redistributed to RIP and OSPF. P332G-ML allows the user to globally disable redistribution of static routes to RIP, and separately to globally disable redistribution of static routes to OSPF. In addition, P332G-ML lets the user configure, on a per static route basis, whether the route is to be redistributed to RIP and OSPF, and what metric (in the range of 1-15). The default state is to enable the route to be redistributed at metric 1. When static routes are redistributed to OSPF, they are always redistributed as external type 2.

Route Preferences

The routing table may contain routes from different sources. Routes to a certain destination may be learned independently from RIP and from OSPF, and at the same time, a static route can also be configured to the same destination. While metrics are used to choose between routes of the same protocol, protocol preferences are used to choose between routes of different protocols.

The preferences only apply to routes for the same destination IP address and mask. They do not override the longest-match choice. For example, a high-preference static default route will not be preferred over a RIP route to the subnet of the destination.

P332G-ML protocol preferences are listed below from the most to the least preferred:

1Local (directly attached net)

2High-preference static (manually configured routes)

3OSPF internal routes

4RIP

5OSPF external routes

6Low-preference static (manually configured routes).

Netbios Rebroadcast

The P332G-ML 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

12 P332G-ML User’s Guide