LAN Failover

Andy Bustamante · *nix forums beginner Joined: 15 Feb 2005 Posts: 16

http://h71000.www7.hp.com/doc/732FINAL/aa-pv5nh-tk/00/01/119-con.html#cegejebd

The System Manger Vol 2 addresses LAN fail over. Key notes, the manual
state that "This command fails if any specified LAN devices have active
users" should really state that This command fails if any specified LAN
devices have active protocols"

You'll either need to stop all protcols or use the DEFINE option in LANCP
and reboot. In either case you'll need to reconfigure the protocols (DECnet,
TCPIP, Pathworks . . .) in use for the new logical lan device and use DEFINE
to configure the permantent database.

$ MCR LANCP
LANCP> SET DEVICE/FAILOVER=(EIA,EIB)/ENABLE LLA0
LANCP> EXIT

Make sure you review the supported NICs. If you're running DECnet the MAC
address based on the DECnet address, that address will migrate from one NIC
to the other on fail over. You may need to configure your network to avoid
delays on fail over. Sessions remain intact.

I'm using this in a production cluster with connections to redundant
switches. Once configured, it just plain works.

--

Andy Bustamante
Remove the ASCII 95s for e-mail

<Ouk@netscape.net> wrote in message
news:1108410796.171685.101350@z14g2000cwz.googlegroups.com...

Ouk@netscape.net · *nix forums beginner Joined: 14 Feb 2005 Posts: 1

Hi,

I've been asked to evaluate the possibility of using the LAN Failover
functionality that arrived in 7.3-2. I'm familiar with NetRAIN in a
Tru64 environment and from the descriptions I've read so far, it would
appear similar.

The 7.3-2 New Features manual gives an overview and suggests reading
the System Manager's Manual, the System Management Utilities
Reference Manual and the I/O User's Reference Manual. These guides
(although there appears to be no mention of LAN Failover in the I/O
Users Reference Guide) give an overview and detail how to create a
failover set, but miss out a lot of the background detail. EG:

* What changes are made to the MAC address when the NICs are added to a
set?
* How does the mechanism that detects a NIC failure work?
* Recommended MAC address aging times for connected ethernet switches?

Can anyone point me to any documentation on LAN Failover that I've
missed?

Is anyone aware of any known problems with running DECNet, TCP/IP, LLC2
or GAP on top a Lan Failover set?

Google