Alteon OS extensions to Vrrp

Alteon OS Application Guide

This section describes the following VRRP enhancements that are implemented in Alteon OS:

Tracking VRRP Router Priority

Alteon OS supports a tracking function that dynamically modifies the priority of a VRRP router, based on its current state. The objective of tracking is to have, whenever possible, the master bidding processes for various virtual routers in a LAN converge on the same switch. Tracking ensures that the selected switch is the one that offers optimal network performance. For tracking to have any effect on virtual router operation, pre-emption must be enabled.

Alteon OS can track the attributes listed in Table 13-1:

Table 13-1VRRP Tracking Parameters

Parameter	Description

Number of IP interfaces on the switch that	Helps elect the virtual routers with the most available
are active (“up”)	routes as the master. (An IP interface is considered active
/cfg/l3/vrrp/track/ifs	when there is at least one active port on the same VLAN.)
	This parameter influences the VRRP router's priority in
	virtual interface routers.

Number of active ports on the same VLAN	Helps elect the virtual routers with the most available
/cfg/l3/vrrp/track/ports	ports as the master. This parameter influences the VRRP
	router's priority in virtual interface routers.
	Note: In a hot-standby configuration, only external ports
	are tracked.

Number of virtual routers in master mode	Useful for ensuring that traffic for any particular client/
on the switch	server pair is handled by the same switch, increasing rout-
/cfg/l3/vrrp/track/vr	ing efficiency. This parameter influences the VRRP
	router's priority in virtual interface routers.

Each tracked parameter has a user-configurable weight associated with it. As the count associ- ated with each tracked item increases (or decreases), so does the VRRP router's priority, sub- ject to the weighting associated with each tracked item. If the priority level of a standby is greater than that of the current master, then the standby can assume the role of the master.

See “Configuring the Switch for Tracking” on page 231 for an example on how to configure the switch for tracking VRRP priority.

230 Chapter 13: High Availability

42C4911, January 2007

42C4911 specifications

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Nortel Networks 42C4911 manual Alteon OS extensions to Vrrp, Tracking Vrrp Router Priority

Models: 42C4911

Alteon OS Application Guide