Layer 3 Features; Forwarding; Ospf Equal Cost Multipath; Dhcp/Bootp Relay - Avaya P333R-LB User Manual

Layer 3 Features

Forwarding

The P333R-LB forwards IP packets between IP networks. When it receives an IP
packet through one of its interfaces, it forwards the packet through one of its
interfaces. P333R-LB supports multinetting, enabling it to forward packets between
IP subnets on the same VLAN as well as between different VLANs. Forwarding is
performed through standard means in Router mode.

OSPF Equal Cost Multipath

The P333R-LB supports load balancing in Layer 3 by using OSPF Equal Cost
Multipath (ECM) and static routes multipath. OSPF and static multipath balances
Layer 3 load forwarding by splitting traffic into several possible equal-cost paths,
thus freeing additional bandwidth for traffic.

DHCP/BOOTP Relay

The P333R-LB supports the DHCP/BOOTP Relay Agent function. This is an
application that accepts DHCP/BOOTP requests that are broadcast on one VLAN
and sends them to a DHCP/BOOTP server that connects to another VLAN or a
server that may be located across one or more routers that would otherwise not get
the broadcast request. The relay agent handles the DHCP/BOOTP replies as well,
transmitting them to the client directly or as broadcast, according to a flag in the
reply message. Note that the same DHCP/BOOTP relay agent serves both the
BOOTP and DHCP protocols.
DHCP/BOOTP Relay in P333R-LB can be enabled or disabled.

RIP

P333R-LB supports the widely used RIP routing protocol (both RIPv1 and RIPv2).
The RIPv1 protocol imposes some limitations on the network design with regard to
subnetting. When operating RIPv1, you must not configure variable length subnet
masks (VLMS). Each IP network must have a single mask, implying that all subnets
in a given IP network are of the same size. Also, when operating RIPv1, you must
not configure supernets, which are networks with a mask smaller than the natural
net mask of the address class, such as 192.1.0.0 with mask 255.255.0.0 (smaller than
the natural class C mask which is 255.255.255.0). For detailed descriptions of RIP
refer to the standards and published literature.
RIPv2 is a new version of the RIP routing protocol, not yet widely used but with
some advantages over RIPv1. RIPv2 solves some of the problems associated with
RIPv1. The most important change in RIPv2 is the addition of a subnet mask field
which allows RIPv2 to support variable length subnets. RIPv2 also includes an
authentication mechanism similar to the one used in OSPF.
Avaya P333R-LB User's Guide
Chapter 1 Overview
7