On Dec 13, 2006, at 5:13 PM, Dan Nelson wrote:

In the last episode (Dec 13), N. Harrington said:
 I am trying to figure out how to bond or combine 2 interfaces
together. Such that they each share traffic.

 I have tried one way, however when I use it I seem to have an odd
broadcast occuring on my switch. Such that I am seeing incoming
traffic hit some other ports on the switch.  Can someone confirm if I
am doing it correctly? Perhaps I have a switch issue? Do I also need
to bond the ports together on the switch? Sadly the switch they are
connected to does not support port bonding. Does that matter? I have
not seen any mention of that being required.

If the remote switch doesn't support it, only outgoing traffic will be
split across both ports. Incoming traffic will probably come in on the
first port that came up, or the switch may decide that there's a
routing loop (or other misconfiguration) because the same MAC address
is seen on both ports, and disable one of the ports (or even both).
Most managed switches should support it; they may call it trunking.

Both sides need to support EtherChannel which is 802.3ad (although Cisco does have a proprietary variant (go figure)). If only one side is set to channel and the other side is not, the non-channeled side will detect a loop and set one of the ports into blocking state; that is, if it's Spanning Tree aware. If it's a consumer-grade switch or hub, the network will do the functional equivalent of a Bill the Cat face and fall over most dramatically.



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