[nsp] High-availabity GigE connection to two switches

Church, Chuck cchurch at wamnetgov.com
Tue Jun 1 14:07:19 EDT 2004

Depending on the NICs and the OS, you may be able to do a fail-over
teaming setup.  I know 3Com, Intel, and Compaq/HP support this.  There
are variations in design, but they work similar to HSRP, where one is
active and the others lay and wait for missing keepalives from the
active NIC.  Once it appears to be down, a standby NIC takes over and
assumes the old NIC's MAC address, so that no ARP re-learning has to

Chuck Church
Lead Design Engineer
Wam!Net Government Services - Design & Implementation Team
13665 Dulles Technology Dr. Ste 250
Herndon, VA 20171
Office: 703-480-2569
Cell: 703-819-3495
cchurch at wamnetgov.com
PGP key:

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Rubens Kuhl Jr.
Sent: Tuesday, June 01, 2004 1:49 PM
To: cisco-nsp at puck.nether.net
Subject: [nsp] High-availabity GigE connection to two switches

Any suggestions on how to provide high-availability to a server that has
two network cards, each one connected to a different switch ?
Etherchannel doesn't seem to apply here, unfortunately. 
(Switch is either a Cat4K or a Cat6k)


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