Allied Telesis AT-S63 User Manual

Chapter 27: Internet Protocol Version 4 Packet Routing

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Section VII: Routing

When the AT-9400 Switch running AT-S63 version 1.3.0 or earlier is 
upgraded to the latest version of the management software, the switch 
automatically creates a routing interface that preserves the previous IP 
configuration of the unit. If the switch had a static address, the interface is 
assigned the same address. If the address was supplied by a DHCP or 
BOOTP server, the DHCP or BOOTP client on the interface is activated. 
The interface is given the interface number 0 and assigned to the 
preexisting management VLAN. Furthermore, the interface is designated 
as the local interface of the switch.

For example, a switch with the static IP address 149.55.55.55, subnet 
mask 255.2552.255.0, and a management VLAN with a VID of 12 will 
have, after the upgrade, a routing interface with the name VLAN12-0 and 
the same static IP address and subnet mask.

By retaining the IP configuration, those management functions (e.g., 
remote Telnet management, syslog client, and RADIUS client) that were 
operating before the upgrade will continue to operate after the unit is 
upgraded to the newest version of the management software. Without this 
feature, you would have to restore the switch’s IP configuration by 
manually creating a routing interface.

If the switch does not have an IP address and the DHCP and BOOTP 
clients are not activated, the upgrade process does not create a routing 
interface.