Lenovo N/Os Extensions To Vrrp - Lenovo Flex System Fabric CN4093 Application Manual

Lenovo N/OS Extensions to VRRP

© Copyright Lenovo 2015
This section describes VRRP enhancements that are implemented in Lenovo N/OS.
Lenovo N/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, preemption must be enabled.
Lenovo N/OS can track the attributes listed in Table
Table 39.
VRRP Tracking Parameters
Parameter
Number of IP interfaces on the
switch that are active ("up")
tracking­priority­increment
interfaces
Number of active ports on the same
VLAN
tracking­priority­increment
ports
Number of virtual routers in master
mode on the switch
tracking­priority­increment
virtual­routers
Each tracked parameter has a user‐configurable weight associated with it. As the
count associated with each tracked item increases (or decreases), so does the VRRP
routerʹs priority, subject 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
configure the switch for tracking VRRP priority.
39 :
Description
Helps elect the virtual routers with the
most available routes as the master. (An IP
interface is considered active when there
is at least one active port on the same
VLAN.) This parameter influences the
VRRP routerʹs priority in virtual interface
routers.
Helps elect the virtual routers with the
most available ports as the master. This
parameter influences the VRRP routerʹs
priority in virtual interface routers.
Note: In a hot‐standby configuration, only
external ports are tracked.
Useful for ensuring that traffic for any
particular client/server pair is handled by
the same switch, increasing routing
efficiency. This parameter influences the
VRRP routerʹs priority in virtual interface
routers.
478 for an example on how to
Chapter 35: Virtual Router Redundancy Protocol
477