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Posted by Rich Seifert on December 12, 2007, 10:41 am
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> Hi ,
>
> I have a query regarding link aggregation.What is the expected
> behaviour for a switch which peer is not sending any BDPU ,both are
> configured on LACP .
>
> Should LACP enabled ports be put into operational down if they dont
> get BPDU's from partners ?
>
The Bridge Relay function (i.e., the entity that performs LAN switching
and which sends/receives BPDUs runs *above* the Link Aggregation
function. That is, from the perspective of the bridge relay, all of the
physical interfaces comprising the aggregation appear as a single LAN
port.
The switch will decide which ports are enabled/disabled for transmission
(ports are always allowed to receive, in order to detect BPDUs) per the
Spanning Tree Protocol (or its descendants: RSTP, MSTP) based on the
reception (or not) of BPDUs. In general, a port will be enabled for
transmission unless the bridge receives a BPDU on that port indicating
that another device has a greater claim to be the Designated Bridge for
that LAN.
There is a good discussion of the Spanning Tree Protocol in Chapter 5 of
"The Switch Book." LACP and Link Aggregation is discussed in Chapter 9.
> Where do I get these standard ?
>
All IEEE 802 standards are available free of charge at:
http://standards.ieee.org/getieee802/index.html
STP is part of IEEE 802.1D. Link Aggregation is (currently) part of
IEEE 802.3 (but will be moving to IEEE 802.1 soon).
--
Rich Seifert Networks and Communications Consulting
21885 Bear Creek Way
(408) 395-5700 Los Gatos, CA 95033
(408) 228-0803 FAX
Send replies to: usenet at richseifert dot com
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