What packet will switch send when config with keepalive ?
When I config keepalive on switch interface, what will happen ? Is it multicast packet or broadcast packet ?
There is syslog information on my switch which I make loop to test BPDUguard.
"%ETHCNTR-3-LOOP_BACK_DETECTED: Keepalive packet loop-back detected on FastEthernet0/7"
Where can I find detail document about it ?
thanks!
thanks for your reply.
I sniffe it and get following:
ETHER: ----- Ether Header -----
ETHER:
ETHER: Packet 106 arrived at 18:49:46.07
ETHER: Packet size = 60 bytes
ETHER: Destination = 0:3:e3:9b:ad:c0,
ETHER: Source = 0:3:e3:9b:ad:c0,
ETHER: Ethertype = 9000 (Loopback)
ETHER:
Source MAC and DEST mac is same and belong to switch static mac.
I can't understand why my test will result in "ETHCNTR-3-LOOP_BACK_DETECTED: Keepalive packet loop-back detected on FastEthernet XX".
My lab is like this:
switch-----hub(portA,portB),one cable is connected portA and portB of hub. So there is loop on hub.
If I disconnect cable between portA and portB, switch will not report ETHCNTR-3-LOOP_BACK_DETECTED.
It looks like that loop on hub result in the error. But I don't know why ?
Who can tell me detail information ?
thanks!
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