EtherChannel network redundance problem Post: 69487

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Operating Systems AIX EtherChannel network redundance problem Post 69487 by Frank2004 on Friday 15th of April 2005 05:24:59 AM

04-15-2005

Registered User

EtherChannel network redundance problem

Problem description:
On the condition of EtherChannel function of AIX, when the data exchange between the nodes on the network, there sometimes lost datat packets and cause the application failed. Once we deconfig EtherChannel and use the single adapter configuration, the application works normally. Anyone can analysize and propose any suggestion? The following are the environment of our onsite system:

Hardware:
4*p630 + 3*p615
dual network adapter for each machine(10/100M Auto Negotiate);
2*Cisco 3550 switch;
Software:
AIX 5.2 , xlC 6.0
Application

Network required: adapter and switch redundance.
If one network adapter on host or on Cisco switch failed, the other one can take over without disrupting our application.

Application:
In the application, we used multiplecast (IP:228.228.228.228) mechanism to send and receive the data packets between the servers and workstations on the network.

Switcth configuration :
using default configuration. nothing added.

system and network connect scenario :
Using AIX EtherChannel to config each server' or workstation' network adapter. On each host, we select one adapter as EhterChannel's primary channel and select the other one as EtherChannel's backup channel. At the same time ,these two adapter connect to two different Cisco 3550 switch. The speed and mode of all of the adapters set to Auto Negotiate. In order to attach the other route while the adapter or switch is failing,there is a Gigbit Fiber link between two switch.

Frank2004

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LEARN ABOUT LINUX

ng_fec

NG_FEC(4)						   BSD Kernel Interfaces Manual 						 NG_FEC(4)

NAME

     ng_fec -- netgraph Fast EtherChannel node

SYNOPSIS

     #include <netgraph/ng_fec.h>

DESCRIPTION

     The fec node implements Ethernet port trunking using the ``Cisco Fast EtherChannel'' protocol.  Upon creation, a fec node creates a network
     interface associated with it.  Interfaces are named ``fec0'', ``fec1'', etc.  New nodes take the first available unit.

HOOKS

     The fec node accepts any hooks.  However it does not use them.  Under normal operation, a fec node should not have any hooks.

CONTROL MESSAGES

     Interface membership in the FEC group is configured with the following control messages:

     NGM_FEC_ADD_IFACE (``add_iface'')
	     Attach interface to the FEC group.  The target interface name is passed as a string argument.

     NGM_FEC_DEL_IFACE (``del_iface'')
	     Remove interface from the trunk.  The target interface name is passed as a string argument.

     The following control messages define the forwarding method for a node:

     NGM_FEC_SET_MODE_MAC (``set_mode_mac'')
	     Forwarding decisions will be based on the link-layer MAC address of the destination.

     NGM_FEC_SET_MODE_INET (``set_mode_inet'')
	     Forwarding decisions will be based on the IP address of the destination.

SHUTDOWN

     This node shuts down upon receipt of a NGM_SHUTDOWN control message.

EXAMPLES

     The following example script creates an fec node, attaches four Ethernet interfaces to it and sets the forwarding method to be IP-address
     based:

	   /usr/sbin/ngctl -f- << SEQ
		   mkpeer fec dummy fec
		   msg fec0: add_iface "dc0"
		   msg fec0: add_iface "dc1"
		   msg fec0: add_iface "dc2"
		   msg fec0: add_iface "dc3"
		   msg fec0: set_mode_inet
	   SEQ

SEE ALSO

     netgraph(4)

HISTORY

     The fec node type was implemented in FreeBSD 5.0.

AUTHORS

     The fec node was written by Bill Paul <wpaul@FreeBSD.org>.  This manual page was written by Gleb Smirnoff <glebius@FreeBSD.org>.

BSD
								   July 22, 2004							       BSD