Simple Router Redundancy Protocol (Srrp); Policy - Quality Of Service (Qos) - Avaya P334T-ML User Manual

In VRRP, two or more physical routers can be associated with a virtual router, thus
achieving the extreme reliability inherent in the SAFER architecture.
In a VRRP environment, host stations interact with the virtual router. They are not
aware that this router is a virtual router, and they are not affected when a new
router takes over the role of master router. This makes VRRP fully interoperable
with every host station.
VRRP can be activated on an interface using a single command while allowing for
the necessary fine-tuning of the many VRRP parameters. For a detailed description
of VRRP, refer to VRRP standards and published literature.

Simple Router Redundancy Protocol (SRRP)

P334T-ML IP SRRP redundancy capabilities provide automatic backup Layer 3
switching for IP stations. P334T-ML units can be configured to back each other up
so that if one fails the other will take over its forwarding functions. The backup
P334T-ML is not idle. As long as both P334T-ML units are functional, traffic is
shared between them. The P334T-ML modules can be in the same P330 stack or in
different, connected, P330 stacks. The P334T-ML can back up another P334T-ML
unit or any other router.
A P334T-ML unit configured to back up another unit monitors the other's status by
polling it at configured intervals, and automatically detects when the other fails and
when it becomes functional again. When detecting a failure, the backup P334T-ML
sends a gratuitous ARP message that causes all stations to send their IP traffic to the
backup P334T-ML MAC address instead of the failed unit MAC address. As long as
it is an active backup resulting from the failure of the main unit, the backup P334T-
ML answers ARP requests for the main unit, providing its own MAC address.
Policy — Quality of Service (QoS)
The P334T-ML supports QoS by using multiple priority levels and IEEE 802.1p
priority tagging to ensure that data and voice receive the necessary levels of service.
The P334T-ML can enforce policy on routed packets (per packet), according to four
criteria:
• The Diff-Serv byte (TOS field) in the IP header of the incoming packet.
• Matching the packet's source or destination IP address to the configured
priority policy.
• Whether the packet source or destination TCP/UDP port number falls within a
pre-defined range.
The P334T-ML can enforce centralized network policies using the Avaya
MultiService Network Manager central policy management application.
P334T-ML User's Guide
Chapter 1 Overview
9