On 5/19/14, 10:13 PM, durga wrote:
6. Switch -> Controller ( Packet_In message < Neighbour Solicitation
(LLDP) reason (no matching action)>)
7. Controller -> Switch ( Packet_Out message <Neighbour
Solicitation(LLDP)> action :Flood)
Steps 6 and 7 are in the wrong order. The controller needs to send the
LLDP before other switches will receive it.
Questions:
1. Is LLDP ON by default ?
OpenFlow doesn't know anything about LLDP.
2. Is LLDP is not ON by default, how is the switch instructed to trigger
the same?
Switches don't send LLDP. A controller can use packet out to send LLDPs.
3. Once LLDP packet is on wire,is the rule [2] intrinsically defaulted
in the switch?
Generally yes. It depends on what version of OpenFlow you're using.
In general, a controller does not need to install any flows to perform
LLDP discovery. The controller can just use packet out and packet in
messages.
--
Wes Felter
IBM Research - Austin
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