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11-108
Cisco MDS 9000 Family Command Reference
OL-8413-07, Cisco MDS SAN-OS Release 3.x
Chapter 11 I Commands
islb vrrp
islb vrrp
To configure iSCSI server load balancing (iSLB) on a Virtual Router Redundancy Protocol (VRRP)
group, use the islb vrrp command. To disable the iSLB configuration on the VRRP group, use the no
form of the command.
islb vrrp {group-number load-balance | ipv6 group-number load-balance}
no islb vrrp {group-number load-balance | ipv6 group-number load-balance}
Syntax Description
Defaults None.
Command Modes Configuration mode.
Command History
Usage Guidelines The host is configured with a VRRP address as the portal address. When the VRRP master port receives
the first iSCSI session from an initiator, it assigns a slave port to serve that particular host. The
information is synchronized to all switches via Cisco Fabric Services (CFS) if recovery is needed when
a master port fails. The initiator gets a temporary redirect iSCSI login response. The host then logs in to
the slave port at its physical IP address. If the slave port goes down, the host will revert to the master
port. The master port knows through CFS that the slave port has gone down and redirects the host to
another slave port.
There are separate VRRP groups for IPv4 and IPv6. Each address family is allowed 256 virtual routers.
Note An initiator can also be redirected to the physical IP address of the master interface.
Tip The load balancing distribution is based on the number of initiators on a port and not on the number of
sessions.
group-number Specifies an IPv4 Virtual Router group number. The range is 1 to 255.
load-balance Enables load balancing on the VRRP group.
ipv6 Specifies IPv6 on the VRRP group.
group-number Specifies an IPv6 Virtual Router group number. The range is 1 to 255.
load-balance Enables load balancing on the VRRP group.
Release Modification
3.0(1) This command was introduced.
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