Reference Guide

The following rules apply to having two IPv6 addresses on a management interface:
• IPv6 addresses on a single management interface cannot be in the same subnet.
• IPv6 secondary addresses on management interfaces:
– across a platform must be in the same subnet.
– must not match the virtual IP address and must not be in the same subnet as the virtual IP.
Viewing Two Global IPv6 Addresses on the S4820T
FTOS#show interfaces managementethernet 0/0
ManagementEthernet 0/0 is up, line protocol is up
Hardware is DellForce10Eth, address is 00:01:e8:a0:bf:f3
Current address is 00:01:e8:a0:bf:f3
Pluggable media not present
Interface index is 302006472
Internet address is 10.16.130.5/16
Link local IPv6 address: fe80::201:e8ff:fea0:bff3/64
Global IPv6 address: 1::1/
Global IPv6 address: 2::1/64
Virtual-IP is not set
Virtual-IP IPv6 address is not set
MTU 1554 bytes, IP MTU 1500 bytes
LineSpeed 1000 Mbit, Mode full duplex
ARP type: ARPA, ARP Timeout 04:00:00
Last clearing of "show interface" counters 00:06:14
Queueing strategy: fifo
Input 791 packets, 62913 bytes, 775 multicast
Received 0 errors, 0 discarded
Output 21 packets, 3300 bytes, 20 multicast
Output 0 errors, 0 invalid protocol
Time since last interface status change: 00:06:03
If there are two RPMs on the system, configure each Management interface with a different IP address. Unless you
configure the management route command, you can only access the Management interface from the local LAN. To
access the Management interface from another LAN, configure the
management route command to point to the
Management interface.
Alternatively, you can use the virtual-ip command to manage a system with one or two RPMs. A virtual IP is an IP
address assigned to the system (not to any management interfaces) and is a CONFIGURATION mode command. When a
virtual IP address is assigned to the system, the active management interface of the RPM is recognized by the virtual IP
address — not by the actual interface IP address assigned to it. During an RPM failover, you do not have to remember
the IP address of the new RPM’s management interface — the system still recognizes the virtual-IP address.
Important Points to Remember — virtual-ip
• virtual-ip is a CONFIGURATION mode command.
• When applied, the management port on the primary RPM assumes the virtual IP address. Executing the show
interfaces and show ip interface brief commands on the primary RPM management interface
displays the virtual IP address and not the actual IP address assigned on that interface.
• A duplicate IP address message is printed for the management port’s virtual IP address on an RPM failover. This
behavior is a harmless error that is generated due to a brief transitory moment during failover when both RPMs’
management ports own the virtual IP address, but have different MAC addresses.
• The primary management interface uses only the virtual IP address if it is configured. The system cannot be
accessed through the native IP address of the primary RPM’s management interface.
• After the virtual IP address is removed, the system is accessible through the native IP address of the primary
RPM’s management interface.
• Primary and secondary management interface IP and virtual IP must be in the same subnet.
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