Hot-Standby Configuration - Lenovo CN4093 Application Manual

Hot-Standby Configuration

© Copyright Lenovo 2015
The primary application for VRRP-based hot-standby is to support Network
Adapter Teaming on your server blades. With Network Adapter Teaming, the
NICs on each server share the same IPv4 address, and are configured into a team.
One NIC is the primary link, and the others are backup links. For more details,
refer to the NetXen 10 Gb Ethernet Adapter documentation.
A hot-standby configuration allows all processes to failover to a standby switch if
any type of failure should occur. All Virtual Interface Routers (VIRs) are bundled
into one Virtual Router group, and then they failover together. When there is a
failure that causes the VRRP Master to failover to the Standby, then the original
primary switch temporarily disables the internal server links, which, in turn,
causes the NIC teams to failover as well.
Note: When using hot-standby redundancy, peer switches should have an equal
number of connected ports.
If hot-standby is implemented in a looped environment, the hot-standby feature
automatically disables the hot-standby ports on the VRRP Standby. If the Master
switch should failover to the Standby switch, it would change the hot-standby
ports from disabled to forwarding, without relying on Spanning Tree or manual
intervention. Therefore, Spanning Tree must be disabled.
Figure 64 illustrates a common hot-standby implementation on a single blade
server. Notice that the blade server NICs are configured into a team that shares the
same IPv4 address across both NICs. Because only one link can be active at a time,
the hot-standby feature controls the NIC failover by having the Standby switch
disable its internal ports (holding down the server links).
Figure 64. Hot-Standby Configuration
Internet
Enterprise
Routing Switch
IF 1: 174.14.20.110
IF 2: 10.1.1.110
VIR 1: 174.14.20.100
VIR 2: 10.1.1.100
Active
Server 1
Switch 1
Hot Standby
Switch 2
Server 2
IF 1: 174.14.20.111
IF 2: 10.1.1.111
VIR 1: 174.14.20.100
VIR 2: 10.1.1.100
Chapter 34: Virtual Router Redundancy Protocol
NIC 1 IP = 10.0.1.1
NIC 1 IP = 10.0.1.2
= Active Links
= Standby Links
515