TCP/IPv6 Configuration and Management Manual (G06.29+, H06.03+, J06.03+)

SCF Reference for NonStop TCP/IPv6
HP NonStop TCP/IPv6 Configuration and Management Manual—524523-012
8-41
ALTER Command

To start the loopback SUBNET, you have to do an ALTER SUBNET command as
follows (the first example is for INET mode and the second one is for INET6
mode):
These are some guidelines to use when configuring Ethernet failover:

The ALTER SUBNET command is required with the ADD SUBNET command to
link the two LIFs for failover.

When selecting the LIF pair for the failover SUBNET pair, you should select LIFs
on different adapters.

When using Fast Ethernet adapters or Gigabit Ethernet adapters connected
directly to Ethernet switches, failover recovery time might be impacted by the
spanning tree feature used in a switch.

You cannot mix adapter types in an Ethernet failover pair.

When using multiple failover pairs on the same network SUBNET and adding static
routes, it’s best to add a copy of each route to one SUBNET in each failover pair.
This increases the availability of the routes should both SUBNETs comprising a
failover pair become unavailable. It also allows NonStop TCP/IPv6 to distribute
outbound connections over the failover pairs when the source IP address is not
selected by the application.

Ethernet failover might not function when directly connected to a firewall that uses
Ethernet-address (MAC)-to-IP address filtering. This problem can be overcome by
adding a router between the LIFs and the firewall.

When configuring multiple, shared IP failover pairs, the reserved IP address cannot
be shared between pairs.
ALTER Command
The ALTER command changes attribute values associated with the specified NonStop
TCP/IPv6 object. This is a sensitive command.
ALTER MON Command for TCP6MAN
The ALTER MON command is used to change the attribute values of the NonStop
TCP/IPv6 subsystem. When you alter attributes of a TCP6MON process you must do
->ASSUME PROCESS $ZZTCP
->ABORT SUBNET LOOP0
->ALTER SUBNET LOOP0, IPADDRESS 127.1
->ASSUME PROCESS $ZZTCP
->ABORT SUBNET LOOP0
->ALTER SUBNET LOOP0, IPADDRESS 127.1
->ALTER SUBNET LOOP0, FAMILY INET6, IPV6 UP